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Table 5 — Compressor Protection Module Inputs and Outputs*
*“X” denotes the circuit, A or B.
†See Appendix D for MTA settings.
DESCRIPTION INPUT/OUTPUT I/O TYPE DISPLAY MODULE POINT NAME
CONNECTION POINT
Pin Notation
Power (24 vac supply) —— —
CPM-X-J1
11 24 vac
12 Ground
Local Equipment Network —— —
CPM-X-JP12
1 RS485 Port (D+)
2 RS485 Port (Gnd)
3 RS485 Port (D-)
CPM-X-J12
1 RS485 Port (D+)
2 RS485 Port (Gnd)
3 RS485 Port (D-)
Circuit X High Pressure Switch HPS-X Switch Not available
CPM-X-J7-CH05
1
2
Oil Level Switch Oil LS X Switch Circuit X Oil Solenoid, OLS.X
CPM-X-J6-CH06
1
2
Must Trip Amps† MTA (S2) 8-Pin DIP Switch Must Trip Amps, MTA.X
Configuration Switch† S1 8-Pin DIP Switch S1 Config Switch, C.SW.X
Compressor X Motor Temperature MTR-X NTC Thermistor Motor Temperature, CTP.X
CPM-X-J9-CH01
1
2
Compressor X Discharge Gas Temperature DGT X NTC Thermistor Discharge Gas Temp, DGT.X
CPM-X-J9-CH02
1
2
Oil Pressure Transducer OPT X Pressure Transducer Oil Pressure, OP.X
CPM-X-J10B-CH04
5V + 5 vdc ref
S Signal
RReturn
Economizer Pressure Transducer
(sizes 175,200,350,400 only)
EPT X Pressure Transducer Economizer Pressure, ECP.X
CPM-X-J10A
5V + 5 vdc ref
S Signal
RReturn
Compressor Current X Phase A Current Sensor CUR.A
CPM-X-J8-CH01
1
2
Compressor Current X Phase B Current Sensor CUR.B
CPM-X-J8-CH02
1
2
Compressor Current X Phase C Current Sensor CUR.C
CPM-X-J8-CH3
1
2
Compressor X 1M Contactor C X 1M Contactor Compressor Output, CP.X
CPM-X-J1-CH07
1
2
Compressor X 2M Contactor C X 2M Contactor Not available
CPM-X-J2-CH8
1
2
Compressor X S Contactor C X S Contactor Not available
CPM-X-J2-CH9
1
2
Oil Solenoid X Oil solenoid-X Solenoid Oil Solenoid Output, OLS.X
CPM-X-J2-CH12
1
2
Load Solenoid X Loading Solenoid-X Solenoid Slide Valve 1 Output, SL1.X
CPM-X-J2-CH13
1
Unload Solenoid X Unloading Solenoid-X Solenoid Slide Valve 2 Output, SL2.X
CPM-X-J2-CH14
1
2