USER GUIDE TB-9035
Ground Master Equipment Ground Monitor
Installation, Operation and Maintenance
Made in the
United States of America
Features and Components
Figure 1. SCS CTC065-5-WW Ground Master
Equipment Ground Monitor
Description
The Ground Master Equipment Ground Monitor
determines whether equipment is properly grounded,
helping to ensure the ESD safety of a process.
The Ground Master Equipment Ground Monitor is a
comprehensive real-time ground monitor that checks
the connection of equipment to grounds in accordance
with the ANSI/ESDA S.20.20 standard. It also monitors
the presence of electromagnetic interference (EMI) on
ground, signaling a possible functionality problem, such
as tool lockup, erratic behavior, parametric error and
more.
The Ground Master Equipment Ground Monitor is
available in three models:
Item
CTC065-RT-WW
CTC065-RT-T
CTC065-5-WW
Description
Ground Master Monitor, with Relay
Output and World Wide Power
Adapter
Ground Master Monitor, with Relay
Output, No Power Adapter
Ground Master Monitor, with
MODBUS Output and World Wide
Power Adapter
Figure 2. CTC065-5-WW features and components
Figure 3. CTC065-RT output connections
The following accessory is available for the Ground
Master Equipment Ground Monitor:
Item
CTC065-C
Description
Extension Cable Unit for Ground
Master Monitor.
SCS
- 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website:
StaticControl.com
TB-9035
Page 1 of 6 August 2015
Supply Power
Outputs to
the tool
© 2015 DESCO INDUSTRIES, INC.
Employee Owned
Controls and Indicators
Power LED
Pass/Fail LED
Enable Switches
Sound On/Off
Fuses
Equipment
Terminals
Ground
Connection
Power
Output
Ext.
Indicates the power is provided for
operation of the Ground Master
Ground Equipment Monitor.
Indicates which ground is being
monitored and the status of each
ground.
Enables/disables the monitoring of
each individual ground connection.
Enables/disables alarm buzzer.
Replaceable safety fuses for each
individual ground connection.
Screw Terminals for connection of
the individual equipment grounds.
Terminal for connection to
reference ground.
Jack for power adapter.
SCS Static Management Program
(SMP) hardware
Pins are connected in parallel with
the Output jack
Safety First
While ensuring proper ESD grounding is a purpose of
using the Ground Master Equipment Ground Monitor,
before connecting equipment make sure that the
equipment itself is properly grounded. The Ground
Master Ground Equipment Monitor only monitors proper
connection to the ground. Do not ground equipment
through this monitor.
Installation and Connections
Placement
Mount the Ground Master Equipment Ground Monitor
on a wall or on a side of equipment where it’s stable
placement and access to all connections is ensured.
DIN-rail mounting is available as well. Place the Ground
Master Equipment Ground Monitor so that the length of
wires to the monitored equipment is minimized
Mounting
Depending on the mounting option that you have
ordered, the Ground Master Equipment Ground Monitor
comes with a bracket to mount it on a flat surface. An
optional DIN bracket to mount it on a standard DIN rail is
available.
Connecting Reference Ground
The Ground Master Equipment Ground Monitor must
be connected to a proper facility ground using its GND
connection. This ground will serve as a reference. No
monitoring is possible without this connection.
Make sure that this reference ground is a true ground and
is properly connected to both facility (power) ground and
to ESD ground, should these be separate at your factory.
Crimp an 18 AWG (1 mm diameter) wire to the supplied
ring terminal and connect it to the GND terminal of the
unit. Connect the other end of this wire to the proper
facility ground. Minimize the length of this wire since
the impedance of this wire will be a significant factor in
measuring ground impedance of all connections. Do not
coil the extra length of this wire.
Overview
The Ground Master Equipment Ground Monitor
continually monitors the grounding status of equipment.
It provides independent ground monitoring of up to eight
tools. Monitoring of ground connection is done according
to the ANSI/ESDA S.20.20 standard. Specific limits are
set to the customer requirements. If no requirements are
specified, default ground impedance is set at the factory
to 10 ohms.
In addition to monitoring the connection to the ground,
the Ground Master Equipment Ground Monitor offers
monitoring of electromagnetic interference (EMI)
voltage on the ground wires often present in a factory
environment. Such interference causes problems with
the operation of equipment.
The Ground Master Equipment Ground Monitor provides
indication and alarm of the status of each ground and
local alarms.
In addition, this monitor provides digital output to
a facility monitoring or data acquisition system for
monitoring.
To extend monitoring by eight points, another Ground
Master Equipment Ground Monitor can be connected
to the extension port. Connected units provide one
combined output to a Facility Monitoring System.
Figure 4. Connecting to main ground.
SCS
- 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website:
StaticControl.com
TB-9035
Page 2 of 6
© 2015 DESCO INDUSTRIES, INC.
Employee Owned
Connecting Equipment Grounds
Use 18 AWG (1 mm diameter) wires to connect them to
the screw terminals of the unit. Connect the other end of
the wire to the grounded connection of your equipment.
Shorten the wires and do not coil or loop the extra wire.
The longer the wire, the higher its impedance and the
more influence it will make on the monitored parameters.
Connecting Power
The Ground Master Equipment Ground Monitor can be
powered in the following ways:
• By a separate power adapter
• Via its RJ45 cable from Facility Monitoring System for
the Ground Master
• Via terminal block for the Ground Master Equipment
Ground Monitor RT
IMPORTANT: Provide power via one way only.
The Ground Master Equipment Ground Monitor needs
12-24VDC. If two monitors are connected together, the
slave monitor gets power from the master unit and the
current requirements double.
• Power Jack A 2.1 mm barrel connector, center positive.
• RJ45 Jack See pinouts for your configuration.
Power must be reasonably clean of spikes and EMI.
Important: Use only the adapter provided by the
manufacturer. Operation with a power supply not
provided by or expressly approved by SCS will void the
warranty.
Data Output (Ground Master)
The Ground Master Equipment Ground Monitor provides
intelligent information to the facility monitoring or data
acquisition system. In this configuration, the Ground
Master Equipment Ground Monitor can be powered by
Facility Monitoring System (FMS) via its data cable.
Pinout of RJ45 Jack for MODBUS
Pin Signal
1
2
3
4
5
6
7
8
+12 to +24 VDC
Ground
+12 to +24 VDC
TXD1/D1
TXD0/D0
Ground
+12 to +24 VDC
Ground
Operation
Figure 5. Monitoring Enable Switches.
Monitoring Enabled
In order for the Ground Master Equipment Ground
Monitor to monitor a particular ground, it must be
enabled by turning ON the appropriate DIP switch. This
way, a wire jumper is not needed to simulate an unused
connection, and the status of every ground connection
will be known.
If a particular connection is not being monitored, turn the
appropriate switch OFF.
Indication
When ground monitoring is enabled on any particular
ground, one of the corresponding LEDs turns on. If the
ground connection is within the specification, the green
LED will be lit. If the ground impedance is higher than
the limit, the red LED will be on. In case the ground
connection impedance is below the alarm limit, but the
particular ground has strong EMI voltage signal present,
the green LED will be on and the red LED will blink.
Figure 6. Ground status LED’s
SCS
- 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website:
StaticControl.com
TB-9035
Page 3 of 6
© 2015 DESCO INDUSTRIES, INC.
Employee Owned
Alarm Limits
Each Ground Master Equipment Ground Monitor is set
to provide an alarm when impedance of the equipment
to the ground goes above the preset limit. This limit is
set at the factory and can be changed using the rotary
switch on the top of the unit with the small screwdriver.
Summary of LED Indications
Status
Ground Impedance Passes
Ground Impedance Fails
Ground Impedance passes
but strong EMI present
Ground Monitoring Disabled
Green
LED
On
Off
On
Off
Red
LED
Off
On
Blinks
Off
Sound
Off
On
Off
Off
Fuses
If the equipment ground is disconnected for some
reason, or the ground wiring is improperly connected,
such equipment may receive significant damage,
sometimes equal to the voltage on the AC mains (110V
or 220V). In order to prevent the spread of this excessive
voltage to other equipment via the Ground Master
Equipment Ground Monitor, fuses are implemented
for each individual ground connection. In the case of
excessive voltage on the equipment, the appropriate
fuse will disconnect the equipment from the Ground
Master Equipment Ground Monitor and from the other
connected equipment. Ground failure on that particular
ground will be immediately indicated.
Before replacing the fuse, always investigate the reason
for the fuse blowing and correct the problem. The fuse
should never be blown under normal circumstances.
Important:
Never use wire jumpers in place of fuses
– use only factory-authorized fuses. Disconnect power
before the replacement of fuses.
Sound can be turned on/off using slide switch.
Setting
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
“0” Setting is reserved - do not use it.
Limit (Ohms)
1
2
3
4
5
6
7
8
9
10
12
14
16
18
20
Operation with Facility Monitoring
System
The Ground Master Equipment Ground Monitor
provides intelligent information to a Facility Monitoring
System (FMS) on the status of each individual ground it
monitors.
Important:
Do not plug the Ground Master Equipment
Ground Monitor into your 10/100 BaseT Ethernet factory
network!
Warning:
Failure to follow these instructions may
result in irreversible damage to the Ground Master
Equipment Ground Monitor and may harm personnel
and equipment. If the Ground Master Equipment Ground
Monitor is connected to a Facility Monitoring System
(FMS), always verify that there is zero voltage and low
resistance between the FMS ground and the ground
at the location where the monitor is being grounded.
If ground conditions are unacceptable, correct them
prior to installing the Ground Master Equipment Ground
Monitor, otherwise damage to personnel, the monitor
and/or FMS may occur.
Specifications
Power
AC/DC Adapter
120VAC, 60Hz
Universal 100-230
VAC, 50-60 Hz
Output: 12VDC @1.5A
Output Plug Polarization:
Center Positive
Output Plug:
0.22" O.D. x 0.08" I.D. x 0.37" L
(5.5 mm O.D. x 2.1 mm I.D x
9.5 mm L)
1.1" H x 3.6" W x 4.5" L
(28 mm H x 92 mm W x 114 mm L)
General
Dimensions
SCS
- 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website:
StaticControl.com
TB-9035
Page 4 of 6
© 2015 DESCO INDUSTRIES, INC.
Employee Owned
Safety Information
Read, understand, and follow all safety information contained in the User Guide prior to installation of the Ground
Master Equipment Ground Monitors. Retain the User Guide for future reference.
Intended Use
The Ground Master Equipment Ground Monitors are intended for use by electrical assembly personnel to monitor
ground impedance for process and equipment tools.
The systems must be installed as specified in the User Guide in an indoor commercial/industrial environment, and
have not been evaluated for other uses or locations. If the equipment is used in a manner not specified by the
manufacturer, the protection provided by the equipment may be impaired.
Warning
To reduce the risks associated with hazardous voltage, environmental contamination and incorrect monitoring
results:
• Read, understand and follow all safety information contained in this user guide for installation and use. Retain this
guide for future reference.
To reduce the risks associated with hazardous voltage:
• Do not modify or attempt to service the power adapter or use it if damaged.
Caution
To reduce the risks associated with environmental contamination:
• Dispose of the monitor and power adapter in accordance with local, state, and federal regulations.
Notice
To reduce the risks associated with environmental contamination:
• Check tester periodically to verify each monitor circuit is functioning correctly.
• Ground Master Equipment Ground Monitors require a suitable ground to function properly. Refer to appropriate
section of this user guide for information on connecting to a suitable electrical ground point.
• Do not use the Ground Master Equipment Ground Monitors as the primary method of electrical grounding - these
devices are intended to monitor the ground connection only.
Regulatory Information
China RoHS
Electronic Industry Standard of the People’s Republic of China, SJ/T11363-2006, Requirements for Concentration
Limits for Certain Hazardous Substances in Electronic Information Products.
This symbol, per Marking for the Control of Pollution Caused by Electronic Information Products, SJ/
T11364-2006, means that the product or part does contain a substance, as detailed in the chart below,
in excess of the following maximum concentration values in any homogeneous material: (a) 0.1%
(by weight) for lead, mercury, hexavalent chromium, polybrominated biphenyls or polybrominated
diphenyl ethers; or (b) 0.01% (by weight) for cadmium. Unless otherwise stated by SCS in writing, this
information represents SCS’s best knowledge and belief based upon information provided by third
party suppliers to SCS.
SCS
- 926 JR Industrial Drive, Sanford, NC 27332 • (919) 718-0000 • Website:
StaticControl.com
TB-9035
Page 5 of 6
© 2015 DESCO INDUSTRIES, INC.
Employee Owned
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