SM20
Level controller or high power interface module
Primary output can directly control motors up to
2HP cosF
phase
0.4-0.5 single
2 SPCO relay outputs
12Vac sensor voltage
1, 2 or 3 sensor inputs
240 or 415Vac supply
DIN rail mounting
T
echnical Specification
Supply Voltage
Sensor Voltage
Sensor Inputs
V
240 or 415ac
V
12Vac
switch contacts or conductive probes
Output 1
SPCO
1500
560
250
28
20
10
8
Outputs
2
Output 2
SPCO
750
not approved
250
not approved
10
10
4
The SM20 is a versatile level control or
interface module that can also be used in
many other process control applications.
One level switch can be connected for an
alarm or two level switches to start and
stop a submersible pump or a solenoid
valve for emptying/filling function
It works with all kind of level switches,
including conductive probes, as well as
pressure switches or other limit switches.
The module can be used as a dry-running
protection, with a pressure switch or filling
level control switch, to start and stop a
pump.
Power supply 240/415 Vac.
Two out-puts:
Main output SPCO 20(8) Ampere 250V
Secondary output SPCO 10(4) Ampere 250V
automatic/manual switch
LED indicators for:
power supply, low level and output on.
Output ratings
Contact Form
Switching Power Max ac
Switching Power Max dc
Switching Voltage AC Max
Switching Voltage DC Max
Switching Current Max Resistive
(n/o contact)
(n/c contact)
Switching Current Max Inductive
Standard Parts
SM20
VA
W
V
V
A
A
A
Inputs
1, 2 or 3
Other versions can be made for particular applications. Please contact Cynergy3 with your requirements.
Mechanical Diagram
Terminal Assignment
24 23 22 21 20 19 18 17 16 15 14 13
SM20 Interface Module
POWER
PUMP
LEVEL
AUTO
MAN
Made in Italy
90 mm
1
3
4
9
10
11
13
14
15
19-20
21-22
23
24
Supply Neutral
Supply Live 240Vac
Supply Live 415Vac
Output 1 nc contact
Output 1 no contact
Output 1 common
Output 2 no contact
Output 2 common
Output 2 nc contact
Low voltage input sensor
Sensor common input
Sensor minimum level
Sensor maximum level
1
2
3
4
5
6
7
8
9 10 11 12
Cynergy3 Components Ltd.
7 Cobham Road
Ferndown Industrial Estate
Wimborne, Dorset BH21 7PE
Telephone +44 (0) 1202 897969
Email:sales@cynergy3.com
53 mm
Low voltage input 19-20 for pressure switch
with contacts closed at minimum pressure
or level switch with contacts closed when
level low.
NB These terminals must be
bridged if no sensor is connected.
ISO
9001
C E R T I F I E D
www.cynergy3.com
© 2012 Cynergy3 Components, All Rights Reserved. Specifications are subject to change without prior notice. Cynergy3 Components and the Cynergy3 Components logo are trademarks of Cynergy3 Components Limited.
Level controller or high power interface module
The SM20 can be used for many process control functions, including:
Dry running control with 2 level switches
Dry running control with 1 level switch
Dry running control with conductive probes
Pump control by pressure switch
Pump control by level switch
Automatic/manual control selector
“No water” alarm or secondary control output
Troubleshooting
Pump does not start, green LED off
No power to module
Pump does not start, yellow LED on
check connections 9-10-11 for pump supply
Pump does not start, yellow LED off
Check link between 19-20. Check pressure or level switch, if fitted. Check system has not
already reach maximum pressure or level
Pump does not start, red LED on
No water in supply tank. Check maximum level switch is correctly installed. Check terminals 21-22-23-24
Pump does no stop
Check the Auto/Man selector. Check that pressure or level switch, on 19-20, functions correctly.
Example: Rainwater supply
Filling a vented roof tank from a rainwater tank.
The pump will operate when the roof tank level is
not at max level and the water in the rainwater tank
is above the low level.
The secondary output relay will operate, if the level
in the rainwater tank drops to the low level, and
opens a solenoid valve to supply water from the
mains water supply, which will remain operated
until the rainwater tank fills to the high level.
The illustration is only for 220/240Vac supply, which
is connected to terminals 0 (neutral) and 3 (live).
High level switch (NC
when level high)
Low level switch (NC
when level high)
Example: Sump pump to drain
This will pump out a sump from a high level down
to a low level.
The pump will be started when the level in the sump
reaches the high level and will continue to pump
until the level falls to the low level.
The pump can also be operated manually using the
switch on the module.
To drain
The illustration is only for 220/240Vac supply, which
is connected to terminals 0 (neutral) and 3 (live). High level switch (NC
when level high)
Low level switch (NC
when level high)
Top tank switch (NC when level low)
Secondary or Alarm circuit
NC
24 23 22 21 20 19 18 17 16 15 14 13
SM20 Interface Module
POWER
PUMP
LEVEL
3
4
MADE IN ITALY
1
2
5
AUTO
MAN
6
7
8
9 10 11 12
nc Common
no
Supply pipe
Pump up to 2HP
Rainwater tank
Link
24 23 22 21 20 19 18 17 16 15 14 13
Solenoid valve
X
Mains water
SM20 Interface Module
POWER
PUMP
LEVEL
3
4
MADE IN ITALY
1
2
5
AUTO
MAN
6
7
8
9 10 11 12
nc Common
no
Pump
Sump tank
NB The diagrams shown above are simplified illustrations of how the module may be used and do not include any necessary safety devices, such
as fuses or thermal cutouts, or statutory requirements for installation of such electrical equipment.
ISO
9001
C E R T I F I E D
www.cynergy3.com
© 2012 Cynergy3 Components, All Rights Reserved. Specifications are subject to change without prior notice. Cynergy3 Components and the Cynergy3 Components logo are trademarks of Cynergy3 Components Limited.
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