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SPMU21X

器件型号:SPMU21X
器件类别:机电产品    工业自动化    控制器   
厂商名称:Sfera Labs
标准:
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器件描述

控制器 Strato Pi Server UPS FCC Compliant

参数
产品属性属性值
制造商:Sfera Labs
产品种类:控制器
RoHS:详细信息
类型:Strato Pi Server UPS
工作电源电压:9 V to 28 V
系列:Strato Pi Server
商标:Sfera Labs
最大工作温度:+ 50 C
最小工作温度:0 C
产品类型:Controllers
工厂包装数量:1
子类别:Controllers
商标名:Strato Pi
单位重量:155 g

SPMU21X器件文档内容

              


Strato Pi UPS User Guide

July 2018

Revision 014

SPBU21X Strato Pi UPS board

SPMU21X Strato Pi UPS server with Raspberry Pi 3 Model B

SPMU21XP Strato Pi UPS server with Raspberry Pi 3 Model B+

                                                            

   Safety information                                                 4

   Qualified personnel                                                 4

   Hazard levels                                                      4

   Safety instructions                                                5

   General safety instructions                                        5

   Battery and external rechargeable battery                          5

   Introduction                                                       7

   Features                                                           8

   Usage and connections                                              9

   Hardware Installation                                              9

   Strato Pi UPS board                                                9

   Strato Pi UPS server                                               10

   The external UPS battery                                           10

   Replacing the RTC backup battery                                   10

   Terminal block                                                     12

   Power supply                                                       13

   Auxiliary power supply output                                      14

   Dedicated GPIO pins                                                14

   Software installation and configuration                             15

   Installing the Strato Pi utility on Raspbian                       15

   Installing the Real Time Clock software                            15

   Testing the Real Time Clock                                        16

   Disabling Bluetooth, WiFi and the serial console                   17

   Using Strato Pi UPS                                                18

   Real Time Clock                                                    18

   Serial port                                                        18

   Buzzer                                                             19

   UPS                                                                20

   Hardware watchdog                                                  20

   Power cycle                                                        21

   Block diagram                                                      22

   Technical specifications                                            23

   Dimensions                                                         25

   Disposal                                                           26

   Installation and use restrictions                                  26

   Standards and regulations                                          26

1                                                    Strato  Pi  UPS  User  Guide
   Safety instructions                                                      26

   Set-up                                                                   26

   Conformity Information                                                   27

   EU                                                                       27

   USA                                                                      27

   CANADA                                                                   27

   AUSTRALIA / NEW ZEALAND                                                  28

   Compliance information for Raspberry  Pi  3  Model  B                    28

   EU                                                                       28

   USA                                                                      28

   CANADA                                                                   28

   Compliance information for Raspberry  Pi  3  Model  B+                   28

   EU                                                                       29

   USA                                                                      29

   CANADA                                                                   29

2                                                          Strato  Pi  UPS  User  Guide
   Be sure to always remove the power supply before connecting or

   disconnecting the Strato Pi UPS board to Raspberry Pi.

   Follow all applicable electrical safety standards, guidelines,

specifications and regulations for installation, wiring and operations of

   Strato Pi UPS.

Carefully and fully read this Strato Pi UPS user guide before installation.

Strato Pi UPS is not authorised for use in safety-critical applications where a failure of the

   product would reasonably be expected to cause personal injury or death. Safety-critical

   applications include, without limitation, life support devices and systems, equipment or

   systems for the operation of nuclear facilities and weapons systems. Strato is neither

designed nor intended for use in critical military or aerospace applications or environments

and for automotive applications or environment. Customer acknowledges and agrees that

   any such use of Strato Pi UPS is solely at Customer's risk, and that Customer is solely

   responsible for compliance with all legal and regulatory requirements in connection with

   such use.

Sfera Labs S.r.l. may make changes to specifications and product descriptions at any time,

   without notice. The product information on the web site or materials is subject to change

   without notice.

   Please download and read the Sfera Labs Terms and Conditions document available at:

   http://www.sferalabs.cc

Strato and Sfera Labs are trademarks of Sfera Labs S.r.l. Other brands and names may be

   claimed as the property of others.

   


   Copyright © 2015-2018 Sfera Labs S.r.l. All rights reserved.

3                                      Strato Pi UPS User Guide
Safety information

Carefully and fully read this user guide before installation and retain it for future reference.

Qualified personnel

The product described in this manual must be operated only by personnel qualified for the

specific task and installation environment, in accordance with all relevant documentation

and safety instructions. A qualified person should be capable of fully identifying all

installation and operation risks and avoid potential hazards when working with this product.

Hazard levels

This manual contains information you must observe to ensure your personal safety and

prevent damage to property. Safety information in this manual are highlighted by the safety

symbols below, graded according to the degree of danger.

   DANGER

Indicates a hazardous situation which, if not avoided, will result in death or serious

personal injury.

   WARNING

Indicates a hazardous situation which, if not avoided, may result in death or serious

personal injury.

   CAUTION

Indicates a hazardous situation which, if not avoided, can result in minor or moderate

personal injury.

NOTICE

Indicates a situation which, if not avoided, can result in damage of property.

4                                                         Strato Pi UPS User Guide
Safety instructions

General safety instructions

Protect the unit against moisture, dirt and any kind of damage during transport, storage

and operation. Do not operate the unit outside the specified technical data.

Never open the housing. If not otherwise specified, install in closed housing (e.g.

distribution cabinet). Earth the unit at the terminals provided, if existing, for this purpose.

Do not obstruct cooling of the unit. Keep out of the reach of children.

   WARNING

Life threatening voltages are present within and around an open control cabinet.

When installing this product in a control cabinet or any other areas where dangerous

voltages are present, always switch off the power supply to the cabinet or equipment.

   WARNING

Risk of fire if not installed and operated properly.

Follow all applicable electrical safety standards, guidelines, specifications and regulations

for installation, wiring and operations of this product.

The Raspberry Pi board could generate a substantial amount of heat when the software

forces the CPU and/or GPU to operate at high load levels. Ensure that the product is

properly installed and ventilated to prevent overheat.

NOTICE

The connection of expansion devices to this product may damage the product and other

connected systems, and may violate safety rules and regulations regarding radio

interference and electromagnetic compatibility.

Use only appropriate tools when installing this product. Using excessive force with tools

may damage the product, alter its characteristics or degrade its safety.

Battery and external rechargeable battery

This product uses a small lithium non-rechargeable battery to power its internal real time

clock (RTC). It also optionally uses an external rechargeable lead-acid battery for the

uninterruptible power supply.

5                                                         Strato Pi UPS User Guide
   WARNING

Improper handling of lithium and lead-acid batteries can result in an explosion of the

batteries and/or release of harmful substances.

Worn-out or defective batteries can compromise the function of this product.

Replace the RTC lithium battery before it is completely discharged. The lithium battery

must be replaced only with an identical battery. See the "Replacing the RTC backup

battery" section for instructions.

Do not throw lithium batteries into fire, do not solder on the cell body, do not recharge, do

not open, do not short-circuit, do not reverse polarity, do not heat above 100°C and protect

from direct sunlight, moisture and condensation.

Only use a lead-acid battery with electrical ratings recommended in the technical

specifications for this product.

Follow the battery manufacturer's instructions when installing the external UPS battery (not

provided).

Dispose of used batteries according to local regulations and the battery manufacturer's

instructions.


6                                                 Strato Pi UPS User Guide
Introduction

Strato Pi UPS enhances the Raspberry Pi Model B version 2 and 3 computers with several

hardware features to make it suitable for use in professional applications where reliability

and service continuity are key requirements.

Strato Pi UPS is available as a bare board or fully assembled unit including a Raspberry Pi

3 Model B or B+ in a standard DIN-rail case.

The information contained in this manual covers all versions, except where explicitly stated

otherwise. The bare board is called “Strato Pi UPS board”, while the assembled unit is

“Strato Pi UPS server”.

7                                             Strato Pi UPS User Guide
Features

Strato Pi UPS board and server:

✓  9-28Vdc power supply, with surge and reverse polarity protection, and 1.1A resettable

   fuse

✓  up to 3.1A max current to the 5V Raspberry Pi power supply input pins (at 24Vdc)

✓  real time clock with replaceable CR1025 Lithium / Manganese Dioxide back-up battery

✓  standard RS-232 and RS-485 interfaces to the Raspberry Pi serial line, with opto-

   isolator and electrostatic discharge protection.

✓  on-board buzzer, connected to a GPIO pin of the Raspberry Pi board, for acoustic

   feedback

✓  hardware watchdog implemented in the Strato Pi board, fully independent from the

   Raspberry Pi, controlled via the GPIO pins of the Raspberry Pi board

✓  on-board LEDs for power supply and serial line activity

✓  power supply and serial connections on a screw terminal block

✓  integrated uninterruptible power supply, with external lead-acid 12V battery

✓  1.1A resettable fuse on battery input

✓  auxiliary power supply output voltage, to power external devices through Strato Pi UPS

✓  simple UPS status and control via the GPIO pins of the Raspberry Pi board

✓  on-board LED for battery operations status

Strato Pi UPS server only:

✓  pre-assembled and tested Raspberry Pi 3 Model B or B+ with Strato Pi board in a

   standard 4 modules DIN rail case

✓  side access to HDMI and 3.5mm jack for audio and composite video

✓  access to all USB ports and Ethernet port (opposite to the power and serial terminal

   block)

8                                                                 Strato Pi UPS User Guide
Usage and connections

                     STRATO PI UPS CONNECTION DIAGRAM

Hardware Installation

Strato Pi UPS board

The Strato Pi UPS board is supplied with all connectors pre-installed. No soldering is

required. You should connect Strato Pi to Raspberry Pi through the GPIO connector. Use

appropriate turrets/spacers to firmly bolt the two boards together, ensuring that no

conductive part of one board touches any part of the other board.

Be particularly careful to ensure there is enough clearance between the Ethernet and USB

connectors and the bottom of Strato Pi’s circuit board.

NOTICE

The GPIO connector of the Strato Pi UPS board must be perfectly aligned to the

Raspberry Pi's GPIO pins. Turning on the Raspberry Pi and/or the Strato Pi UPS board

with the GPIO not correctly connected will damage both the Raspberry Pi and Strato Pi

UPS.

9                                                                  Strato Pi UPS User Guide
Strato Pi UPS server

The Strato Pi UPS server comes pre-assembled with a Raspberry Pi 3 Model B or B+

board, in a plastic standard DIN-rail case.

There is no need to open the case, unless a change in the RS-485 termination resistors is

required (see below).

The Micro SD card (not provided) can be inserted through a small opening on the side of

the case. Use a small pen or paper clip to gently push the card in its slot.

The external UPS battery

To take advantage of the UPS features of Strato Pi, you can connect an external lead acid

rechargeable battery to the BATT terminals of the Strato Pi UPS terminal block. See the

connection diagram above.

            WARNING

Improper handling of lead acid batteries can result in an explosion of the batteries and/or

release of harmful substances.

Worn-out or defective batteries can compromise the function of this product.

Replace the battery every 5 years even if the battery is still working properly.

Only use a lead acid battery with electrical ratings recommended in the technical

specifications for this product (12V 1.2Ah max).

Reversing the battery polarity may damage the product and the battery.

Dispose of used batteries according to local regulations and the battery manufacturer's

instructions.

Follow the battery manufacturer's instructions when installing the external UPS battery (not

provided).

Replacing the RTC backup battery

Strato Pi UPS has a hardware real time clock with a dedicated long-life non-rechargeable

back-up battery.

Strato Pi UPS is shipped with a CR1025 Lithium / Manganese Dioxide (Li/MnO2) battery

installed.

The battery is only used to power the RTC chip when the main or UPS battery power is not

available (when the Raspberry Pi is off). Depending on operating conditions it should last

up to two years if the Strato Pi board is not powered, more if the Strato Pi UPS receives

external power.

10                                               Strato Pi UPS User Guide
    WARNING

Improper handling of lithium batteries can result in an explosion of the batteries and/or

release of harmful substances.

Worn-out or defective batteries can compromise the function of this product.

KEEP OUT OF REACH OF CHILDREN. Swallowing may lead to serious injury or death in

as little as 2 hours due to chemical burns and potential perforation of the esophagus.

Immediately see doctor.

Replace the RTC lithium battery before it is completely discharged. Replace the battery

every 5 years even if the battery is still working properly. The lithium battery must be

replaced only with an identical CR1025 Lithium / Manganese Dioxide (Li/MnO2) battery.

Do not throw lithium batteries into fire, do not solder on the cell body, do not recharge, do

not open, do not short-circuit, do not reverse polarity, do not heat above 100°C and protect

from direct sunlight, moisture and condensation.

Dispose of used batteries according to local regulations and the battery manufacturer's

instructions.

The RTC backup battery holder is soldered to the bottom layer of the circuit board,

between the GPIO connectors. In the Strato Pi UPS server, the battery is not accessible

from the outside. You should first remove the case top body to gain access to the Strato Pi

UPS circuit board.

NOTICE

Before opening the Strato Pi UPS case, disconnect all power sources, any connection to

external devices, including USB cables, and disconnect the UPS external battery.

Use a non-conductive pin or small tool to help extract the battery from its holder. Insert the

new battery with a gentle push. You don't need tools to insert the battery. The battery is

held into place by a spring contact.

Be sure to insert the battery so that the positive (+) terminal of the battery is in contact with

the outer body of the battery holder, and the negative (-) terminal is in contact with the

contact pad of the circuit board, as shown in the photo below.

Reversing the battery polarity may damage the product.

The real time clock will reset its time immediately when the RTC backup battery is

disconnected.

Follow these steps, in the exact order, to open the case and replace the battery:

1.  Remove the microSD card (the card will be damaged if you open the case with the

    card still inserted)

2.  Remove the black plastic DIN rail hook

3.  With a small flat screwdriver gently separate the bottom case and boards assembly

    from the top cover

11                                                              Strato Pi UPS User Guide
4.  Use a non-conductive pin or small tool to help extract the battery from its holder

5.  Insert the new battery with a gentle push. Respect the battery polarity

6.  Replace the case bottom applying a gentle pressure on the corners

7.  Replace the black plastic DIN rail hook

8.  Insert the microSD card.

                                RTC BACKUP BATTERY

Terminal block

Strato Pi UPS has a 10 positions terminal block for power, battery, auxiliary power supply

output and serial connections.

The maximum conductor cross section is 1.5 mm2 (16 AWG), or 0.5 mm2 when using

ferrules (highly recommended). Recommended stripping length is 5 mm. Screw thread is

M2. Never exceed 0.25 Nm torque when tightening the screws.

                              THE STRATO PI UPS CIRCUIT BOARD

12                                                             Strato Pi UPS User Guide
Power supply

Strato Pi UPS can be powered with DC voltage only:

✓   DC: nominal voltage range 8.1V to 28.0V.

Respect the correct polarity shown in the schematic diagram (+ -). The power supply

circuit implements reverse polarity protection using an auto resetting fuse and surge

protection up to ±1000V/2ohms 1.2/50μs.

A blue on-board LED, also visible through the front panel of the DIN-rail case, is lit when

power supply is available.

When a Strato Pi UPS board is used, never connect the Raspberry Pi micro-USB power

plug.

The Strato Pi UPS power supply stage is optimised to deliver up to 3A at 5V to the

Raspberry Pi. Because Strato Pi has a 1.1A resettable fuse (polyfuse) on the power supply

line, the maximum current that its regulator can deliver is also limited by this fuse, and

depends on the input voltage. The following table lists the typical measured output current

of the power supply stage at different input voltages and the corresponding input current.

       STRATO PI UPS POWER SUPPLY STAGE TYPICAL IN/OUT VOLTAGE AND CURRENT

A 1.1A resettable fuse is also used to protect the battery input. When Strato Pi UPS works

under battery power, the maximum 5V current delivered to the Raspberry Pi should not

exceed 2.0A when the battery is fully charged.

13                                                  Strato Pi UPS User Guide
Auxiliary power supply output

Strato Pi UPS has an auxiliary power supply output pin, labeled VSOUT, to power external

devices.

The aux power supply output is connected to the main power supply input, and switched to

the battery input when there is no power on the main power supply input.

It is not a regulated voltage output and should only be used to power devices that accept a

wide range power supply, compatible to both the battery voltage and the power supply

voltage you are using.

When the Raspberry Pi is turned off by the Strato Pi UPS controller, the aux power supply

output is also switched off.

The maximum current drawn by the loads connected to VSOUT is limited by the current

drawn by the Raspberry Pi, the power supply or battery input voltage, and the 1.1A

resettable fuses that limit the total amount of input current.

Dedicated GPIO pins

Strato Pi uses some of the Raspberry  Pi’s  GPIO pins. These pins should not be       used  for

other functions.

    GPIO pin            Direction                               Description

    GPIO2/SDA                               I2C SDA line for the real time clock

    GPIO3/SCL                               I2C SCL line for the real time clock

    GPIO14/TXD          out                                     serial TX line

    GPIO15/RXD          in                                      serial RX line

    GPIO5               out                 cycle high/low for watchdog heartbeat

    GPIO6               out                 set to high to enable the watchdog

    GPIO12              in                  high on watchdog timeout

    GPIO16              out                 set to high to enable the shutdown cycle

    GPIO20              out                 set to high to sound the buzzer

    GPIO26              in                  high when on battery power

14                                                              Strato Pi UPS User Guide
Software installation and configuration

All features of Strato Pi UPS, except the real time clock, are controlled via dedicated GPIO

pins and can be used with any operating system and programming language that supports

the GPIO pins control on Raspberry Pi. The real time clock is interfaced via the I2C serial

bus.

The following software installation notes are based on the Raspbian Jessie operating

system.

Installing the Strato Pi utility on Raspbian

The Strato Pi utility is a simple command-line script to control Strato Pi’s buzzer, watchdog

and UPS functions.

Run the following commands to download and install the Strato Pi utility:

$  cd  /usr/local/bin

$  sudo  wget   http://sferalabs.cc/files/strato/strato

$  sudo  chmod   755  strato

You can run the Strato Pi utility without arguments to print its options:

$  strato

Usage:   strato   beep  on|off|length_millis|length_millis       pause_millis  repeats

         strato   watchdog     enable|disable|heartbeat|timeout

         strato   shutdown

         strato   battery

All commands should be run as superuser, so always use sudo to run strato.

Installing the Real Time Clock software

The RTC is based on the Microchip MCP79410 module and is connected to the Raspberry

Pi via its I2C serial bus.

Before downloading the installation utility, you should enable I2C and install the “i2c-tools”

package.

To enable I2C, run the “raspi-config” configuration utility:

$  sudo  raspi-config

Then go to “Advanced Options”, “I2C” and select “yes” to enable the I2C interface, then

reboot your Raspberry Pi.

To install the “i2c-tools” package:

$  sudo  apt-get      update

$  sudo  apt-get      install  i2c-tools

With these prerequisite installs completed, you should download and run Strato Pi’s

installation script:

$  cd

$  wget  http://sferalabs.cc/files/strato/rtc-install

15                                                               Strato Pi UPS User Guide
$     chmod    755      rtc-install

$     sudo     ./rtc-install

If the script completes with no errors, delete the installation script and reboot:

$     rm  rtc-install

$     sudo     reboot

Testing the Real Time Clock

Assuming you are connected to the Internet and your Pi was able to reach a public NTP

(Network Time Protocol) server, you should see the current date and time using the “date”

command:

$     date

Thu       Dec  10   18:02:32        CET     2015

Also check the date and time stored in the hardware clock:

$     sudo     hwclock       -r

Thu       10   Dec  2015     06:03:01        PM    CET      -0.546570     seconds

If the returned date and time is not correct, or “hwclock” returns an error, use the “-w”

option to set the hardware clock to the current time:

   $  sudo     hwclock       -w

Then recheck the time stored in the hardware clock to ensure it matches. Linux may have

failed to automatically update the hardware clock after the last reboot if its internal

registers contained invalid values.

If the RTC still doesn’t work, you should check if the Pi sees the RTC chip on the I2C bus.

Run these two commands:

$     sudo     modprobe      -r     rtc_ds1307

$     sudo     i2cdetect         1

WARNING!           This  program        can     confuse     your     I2C  bus,     cause  data  loss  and  worse!

I     will     probe     file       /dev/i2c-1.

I     will     probe     address        range      0x03-0x77.

Continue?           [Y/n]

          0    1    2    3       4  5    6      7  8    9   a     b  c    d     e  f

00:                      --  --     --  --   --    --   --  --  --   --   --  --   --

10:       --   --   --   --  --     --  --   --    --   --  --  --   --   --  --   --

20:       --   --   --   --  --     --  --   --    --   --  --  --   --   --  --   --

30:       --   --   --   --  --     --  --   --    --   --  --  --   --   --  --   --

40:       --   --   --   --  --     --  --   --    --   --  --  --   --   --  --   --

50:       --   --   --   --  --     --  --   57    --   --  --  --   --   --  --   --

60:       --   --   --   --  --     --  --   --    --   --  --  --   --   --  --   6f

70:       --   --   --   --  --     --  --   —

You should see “6f” in the address list. This is the address of the RTC.

If the RTC address is detected, double check your software installation for issues at the

Linux modules level.

Run the “lsmod” command to list the loaded modules and check that “i2c_dev” and

“i2c_bcm2708” are both listed.

If the RTC address is not detected, the cause could be a hardware problem, on the Strato

board or the Raspberry Pi. If you have another Pi or Strato board, try swapping them to

isolate the faulty board.

16                                                                                        Strato Pi UPS User Guide
Disabling Bluetooth, WiFi and the serial console

On Raspberry Pi 3, the main UART is used for Bluetooth, and the TX/RX pins on the GPIO

connector are controlled by a limited function Mini UART.

To route the main UART to the RX/TX pins that are connected to the Strato Pi serial ports

you should disable Bluetooth. Edit /boot/config.txt and add these lines at the end of the file:

#  Disable  Bluetooth

dtoverlay=pi3-disable-bt

You may also run the following command to disable the Bluetooth HCI UART driver:

sudo  systemctl   disable  hciuart

If you need to disable the WiFi, one convenient solution on Raspbian distributions is to

blacklist the WiFi driver. Edit /etc/modprobe.d/raspi-blacklist.conf and add these lines at

the end of the file:

#  Disable  WiFi

blacklist   brcmfmac

blacklist   brcmutil

Note that Bluetooth must be disabled to ensure proper operation of Strato Pi’s serial ports.

If you are using Strato Pi’s serial ports for your applications, you also need to disable the

Linux serial console, otherwise it will send console data to the serial port.

Disable the ttyAMA0 console service:

sudo  systemctl   disable  serial-getty@ttyAMA0.service

Edit the /boot/cmdline.txt file and delete the serial console configuration:

console=serial0,115200

17                                                         Strato Pi UPS User Guide
Using Strato Pi UPS

Real Time Clock

Strato Pi UPS has a hardware real time clock with a dedicated long-life non-rechargeable

back-up battery.

Once the RTC modules and configuration files are properly installed, you will simply use

the date and time commands to control the hardware clock.

Serial port

Strato Pi UPS uses the Raspberry Pi standard UART TX/RX pins on the GPIO connector

to implement a standard serial port with support for both RS-232 and RS-485.

Simply connect the RS-232 RX, TX and GND lines to the RS-232 posts of the Strato Pi

terminal block or the RS-485 A, B and GND to the RS-485 posts of the terminal block.

Never connect both RS-232 and RS-485 lines to Strato Pi. Strato implements a single

serial port, not two.

Both interfaces are isolated from the Raspberry Pi’s serial lines using dedicated opto-

couplers and from the main power supply with a high-efficiency DC-DC converter. This

configuration should prevent ground loops between devices connected through the serial

lines.

The RS-485 TX/RX switching is implemented automatically in the Strato Pi’s micro-

controller, based on speed and number of bits detection, and is completely transparent to

the software controlling the UART on Raspberry Pi.

The RS-485 line has 620 Ohm pull-up and pull-down resistors on lines A and B. The

biasing resistors ensure that, during idle periods the data lines are kept at a stable voltage

level and prevent false triggering of receiver input.These resistors can be disabled by

removing jumpers JP1 and JP3 respectively.

A 100 Ohm termination resistor between A and B can be enabled installing jumper JP2.

                       RS-485 JUMPERS SCHEMATIC

18                                                         Strato Pi UPS User Guide
                                    RS-485 JUMPERS POSITION

Buzzer

Strato Pi UPS has an on-board buzzer that can be controlled using GPIO20. Simply set

GPIO20 to high to emit a continuous sound, and back to low to stop. The buzzer is not

intended to emit sound indefinitely and could be damaged doing so.

The Strato Pi utility has several commands to control the buzzer.

Buzzer on continuously:

$  sudo  strato  beep  on

Buzzer off:

$  sudo  strato  beep  off

Buzzer on for 500 milliseconds:

$  sudo  strato  beep  500

Buzzer on for 500 milliseconds, followed by 100 milliseconds pause, repeated three times:

$  sudo  strato  beep  500  100  3

19                                                                 Strato Pi UPS User Guide
UPS

When an external lead-acid rechargeable battery is connected to the Strato Pi UPS board,

the Raspberry Pi will remain powered by the Strato Pi board when the main power supply

fails, as long as there is enough energy in the battery.

When power is available, the external rechargeable battery is slowly charged with a 30mA

current.

Battery operations status is visually notified with an on-board LED and can be checked

reading Raspberry Pi's GPIO26 pin.

You can start a delayed power off cycle by rising Raspberry Pi’s GPIO16 pin.

When GPIO16 is set to high, Strato Pi will wait 60 seconds and then power off the Pi board

for at least 5 seconds.

After being powered off, the Strato Pi UPS board will supply power to the Raspberry Pi

only when the main power source is restored.

Starting from a power off condition, the Raspberry Pi will not receive power if only the

back-up battery is connected to the Strato Pi board.

The Strato Pi utility implements the following commands to monitor and control the UPS.

To print “1” if Strato Pi is operating from the battery, or “0” if main power is present:

$  sudo   strato  battery;  echo  $?

Hardware watchdog

Strato Pi UPS implements a dedicated hardware watchdog circuit that can be used to

perform a full power cycle of the Raspberry Pi.

Being controlled by Raspberry Pi’s GPIO pins, it is extremely easy to control watchdog

operation using simple custom scripts in your application.

The watchdog is normally disabled. To enable it, set GPIO6 pin to high. While GPIO6 is

high, the Strato Pi controller will watch for state changes of the GPIO5 heartbeat pin. You

should ensure that GPIO5 flips its state between high and low faster than every 60

seconds.

If the Strato Pi UPS controller doesn’t see GPIO5 changing state for more than 60

seconds, it will initiate a shutdown procedure, rising the GPIO12 timeout pin to high, to

signal that a watchdog timeout has occurred.

If possible, you should immediately initiate a software shutdown on Raspberry Pi, and set

the GPIO16 shutdown pin to high. When GPIO16 is set to high or 60 seconds after the

timeout, Strato Pi will wait 60 seconds more, then power cycle the Raspberry Pi.

Note that Strato Pi UPS will power cycle the Raspberry Pi even if GPIO16 is not set high.

In this case the power cycles occurs 120 seconds after the heartbeat timeout.

The Strato Pi utility can be used to control the watchdog from your own application.

Enable the watchdog:

$  sudo   strato  watchdog  enable

Disable the watchdog:

$  sudo   strato  watchdog  disable

20                                                          Strato Pi UPS User Guide
Send the heartbeat:

$  sudo  strato  watchdog  heartbeat

Print “1” if the watchdog timeout is expired, “0” if not:

$  sudo  strato  watchdog  timeout;     echo  $?

Power cycle

You can start a delayed power cycle by rising Raspberry Pi’s GPIO16 pin.

When GPIO16 is set to high, Strato Pi UPS will wait 60 seconds and then   power  off  the  Pi

board for 5 seconds.

The power cycle also affects the VSOUT auxiliary power supply output.

To initiate a delayed power off cycle:

$  sudo  strato  shutdown

21                                                         Strato Pi UPS User Guide
Block  diagram

                STRATO PI UPS BLOCK DIAGRAM

22                                           Strato Pi UPS User Guide
Technical specifications

Power supply                                        9-28V⎓ (VDC)

                                                    Reverse polarity protection with 1.1A resettable

                                                    fuse. Surge protection up to ±1000V/2ohms

                                                    1.2/50μs

Battery input                                       12V lead acid battery (not provided).

                                                    Suggested capacity: 1.2Ah. Reverse polarity

                                                    protection with 1.1A resettable fuse. Surge

                                                    protection up to ±500V/2ohms 1.2/50μs

UPS battery maximum charge voltage                  15V

UPS battery charge current                          30mA

Voltage threshold for switching to battery mode     7.2V, 0.2V hysteresis

Current consumption at VS+ 12V⎓                     150mA w/o Ethernet and battery

including Raspberry Pi 3 current, with low CPU/GPU  180mA with Ethernet, battery and RS-485

load and no USB devices connected                   Actual current consumption may vary based on

                                                    working conditions

Current consumption at VS+ 24V⎓                     85mA w/o Ethernet and battery

including Raspberry Pi 3 current, with low CPU/GPU  100mA with Ethernet, battery and RS-485

load and no USB devices connected                   Actual current consumption may vary based on

                                                    working conditions

Raspberry platform compatibility                    Pi 3 Model B+

                                                    Pi 3 Model B

                                                    Pi 2 Model B

                                                    (only tested with Pi 3 for CE and FCC compliance)

Serial communication ports                          RS-485 Half-Duplex with automatic data direction

                                                    management

                                                    RS-232 Full-Duplex

Baud Rates on COMM ports                            1200 to 115200

ESD-Protection Voltage on RS-232 TX/RX              ±15kV human body model

                                                    ±8kV contact discharge

ESD-Protection Voltage on RS-485 A/B                ±15kV human body model

                                                    ±8kV contact discharge

Surge protection on RS-485 A/B                      Surge protection up to ±500V/2ohms     1.2/50μs;

                                                    600W peak pulse power capability at    10/1000μs

                                                    waveform

Fail safe feature on RS-485                         Yes

23                                                                         Strato Pi UPS User Guide
                       Internal RTCC circuit with backup lithium battery.

                       Only use CR1025 Lithium / Manganese Dioxide (Li/

Real time clock        MnO2) batteries.


                       Expected battery life without main power supply:

                       ~2 years

Housing                standard 4M for DIN rail

Operating temperature  0…+50 °C

Storage temperature    -20…+70 °C

Protection degree      IP20

Weight                 35 g (Strato Pi UPS board)

                       155 g (Strato Pi UPS server)

24                                        Strato Pi UPS User Guide
Dimensions

            DIMENSIONS (mm)

25                           Strato Pi UPS User Guide
Disposal

Waste Electrical & Electronic Equipment

                (Applicable in the European Union and other European countries with

                separate collection systems). This marking on the product, accessories or

                literature indicates that the product should not be disposed of with other

                household waste at the end of their working life. To prevent possible harm to

                the environment or human health from uncontrolled waste disposal, separate

                these items from other types of waste and recycle them responsibly to

                promote the sustainable reuse of material resources. Household users

should contact either the retailer where they purchased this product, or their local

government office, for details of where and how they can take these items for

environmentally safe recycling. This product and its electronic accessories should not be

mixed with other commercial wastes for disposal.

Strato Pi UPS contains a small non rechargeable manganese dioxide lithium coin battery.

In the Strato Pi UPS server, the battery is not accessible from the outside. You should first

remove the case top body to gain access to the Strato Pi UPS circuit board. Always

remove the battery before disposing of this product.

Installation and use restrictions

Standards and regulations

The design and the setting up of electrical systems must be performed according to the

relevant standards, guidelines, specifications and regulations of the relevant country. The

installation, configuration and programming of the devices must be carried out by trained

personnel.

The installation and wiring of connected devices must be performed according to the

recommendations of the manufacturers (reported on the specific data sheet of the product)

and according to the applicable standards.

All the relevant safety regulations, e.g. accident prevention regulations, law on technical

work equipment, must also be observed.

Safety instructions

Carefully read the safety information section at the beginning of this document.

Set-up

For the first installation of the device proceed according to the following procedure:

✓   make sure all power supplies and the external battery are disconnected

✓   install and wire the device according to the schematic diagrams on the specific product

    user guide

✓   after completing the previous steps, switch on the power supply and other related

    circuits.

26                                                    Strato Pi UPS User Guide
Conformity Information

EU

This device complies with the essential requirements of the following directives and

harmonised standards:

✓   2014/35/UE (Low Voltage)

✓   2014/30/UE (EMC)

✓   EN61000-6-2:2005 (EMC Immunity)

✓   EN60664-1:2007 (Electrical safety)

✓   EN61000-6-4:2007 (Emission for industrial environments)

✓   2011/65/UE (RoHS)

The declaration of conformity is available on the internet at the following address: https://

www.sferalabs.cc/strato-pi/

USA

This equipment has been tested and found to comply with the limits for a


Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful interference when the equipment is

operated in a commercial environment. This equipment generates, uses, and can radiate

radio frequency energy and, if not installed and used in accordance with the instruction

manual, may cause harmful interference to radio communications. Operation of this

equipment in a residential area is likely to cause harmful interference in which case the

user will be required to correct the interference at his own expense. The end user of this

product should be aware that any changes or modifications made to this equipment

without the approval of the manufacturer could result in the product not meeting the Class

A limits, in which case the FCC could void the user's authority to operate the equipment.

Shielded cables must be used with this equipment to maintain compliance with FCC

regulations.

This device complies with Part 15 of the FCC Rules. Operation is subject to the following

two conditions: (1) this device may not cause harmful interference, and (2) this device

must accept any interference received, including interference that may cause undesired

operation.

CANADA

This Class A digital apparatus complies with Canadian ICES-003 (A).

Cet appareil numérique de la classe A est conforme à la norme NMB-003 (A) du Canada.

27                                                           Strato Pi UPS User Guide
AUSTRALIA / NEW ZEALAND

WARNING: This equipment is compliant with Class A of CISPR 32:2015. In a residential

environment, this equipment may cause radio interference.

Compliance information for Raspberry Pi 3 Model B

Strato Pi UPS server model SPMU21X contains a standard Raspberry Pi 3 Model B single

board computer. This board has WiFi and Bluetooth radios. It is user accessible and

replaceable.

EU

Raspberry Pi 3 Model B is in conformity with the essential requirements and other relevant

requirements of the Radio Equipment Directive 2014/53/EU.

USA

Raspberry Pi 3 Model B FCC IDENTIFIER: 2ABCB-RPI32

The antenna(s) used for this transmitter must be installed to provide a separation distance

of at least 20 cm from all persons and must not be colocated or operating in conjunction

with any other antenna or transmitter, except in accordance with FCC multitransmitter

product guidelines. This (WiFi  DTS) device has 20 MHz bandwidth mode.

CANADA

Raspberry Pi 3 Model B IC CERTIFICATION No.: 20953-RPI32

This device complies with Industry Canada license-exempt RSS standard(s). Operation is

subject to the following two conditions: (1) this device may not cause interference, and (2)

this device must accept any interference, including interference that may cause undesired

operation of the device.

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils

radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes: (1)

l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter

tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en

compromettre le fonctionnement.

Compliance information for Raspberry Pi 3 Model B+

Strato Pi UPS server model SPMU21XP contains a standard Raspberry Pi 3 Model B+

single board computer. This board has WiFi and Bluetooth radios. It is user accessible and

replaceable.

28                                                         Strato Pi UPS User Guide
EU

Raspberry Pi 3 Model B+ is in conformity with the essential requirements and other

relevant requirements of the Radio Equipment Directive 2014/53/EU.

USA

Raspberry Pi 3 Model B+ FCC IDENTIFIER: 2ABCB-RPI3BP

The antenna(s) used for this transmitter must be installed to provide a separation distance

of at least 20 cm from all persons and must not be colocated or operating in conjunction

with any other antenna or transmitter, except in accordance with FCC multitransmitter

product guidelines. This (WiFi  DTS) device has 20 MHz bandwidth mode.

CANADA

Raspberry Pi 3 Model B+ IC CERTIFICATION No.: 20953-RPI3P

This device complies with Industry Canada license-exempt RSS standard(s). Operation is

subject to the following two conditions: (1) this device may not cause interference, and (2)

this device must accept any interference, including interference that may cause undesired

operation of the device.

Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils

radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes: (1)

l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter

tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en

compromettre le fonctionnement.

29                                                         Strato Pi UPS User Guide
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