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Operating and Maintenance Instructions
Appendix B – Electrical Connections
The following is an image of the PCB showing location and identity of the connectors and pin functions.
PCB
BOTTOM
SIDE
PCB TOP
SIDE
PCB Bottom Side
Supply
Control & Supply
RS485 Master
(Fans)
RS485 Slave
(BMS)
Mating 3-way Pluggable Connector – Manufacturer: IMO Precision Controls – Part Number:
Note:
All "Power supply +" and "+24V" terminals are common (i.e. connected together)
All "0V" terminals are common (i.e. connected together)
PCB Top Side
Configurable Alarm Output
Mating 2-way Pluggable Connector
Crimp terminal AWG 22 to AWG28
Note: Do not connect anything to the 4-way plug-in "COM" connector or to the 5-way plug-in "I2C / SPI" and
"PROGRAMMER" connectors.
210-OMI14229-Iss8.1
Sealing Plug: DO NOT CONNECT the 10VDC
output from fans here if the controller is
powered from an external power supply.
PCB
Label
0V
+
POT
+10VDC Output (only when supply to controller is at least 12VDC)
0-10V
0V
+24V
A
B
0V
+
A
B
0V
Table 4 – PCB Bottom Side Connector Identities and Pin Functions
Relay
60VDC - 0.1A
Table 5 – PCB Top Side Connector and Pin Function
© ebm-papst UK Ltd 2021
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
Common 0V (GND)
Power Supply +
Speed Control Input / Pressure Sensor Input
Common 0V (GND)
Power supply +
RS485 'A' from Fans
RS485 'B' from Fans
Common 0V (GND)
Power supply +
RS485 'A' from 3
RS485 'B' from 3
Common 0V (GND)
20.1550M/3-E
PCB Label
RL
RL
Normally Closed Relay Contact
– Manufacturer: Molex – Part Number: 50-37-5023
– Manufacturer Molex – Part number 08-70-1040
CN1116 Full OMI
sales@uk.ebmpapst.com
Connection
Party System e.g. BMS
rd
Party System e.g. BMS
rd
Connection
Common Relay Contact
Page 30 of 47
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