Compressor Controller - McQuay WSC Operating Manual

Table 3, Unit Controller, Digital Outputs
#
NO1
NO2
NO3
NO4
NO5
NO6
NO7
NO8
NO9
NO10
Table 4, Unit Controller, Analog Outputs
# Description
Cooling Tower Bypass Valve Position
Y1
Y2 Cooling Tower VFD Speed
Y3 Electronic Expansion Valve (EEV)

Compressor Controller

The compressor controller's primary function is controlling and protecting the compressor. No
setpoint inputs are made with it. There is one compressor controller for each compressor on a dual
chiller unit. The compressor controller receives, processes, and sends data to other controllers and
devices and to the compressor starter or variable frequency drive (VFD). With some operator
intervention the compressor controller can operate the compressor(s) if the unit controller and/or
the operator interface touch screen are unavailable. Inputs and outputs are as follows:
Table 5, Compressor Controller, Analog Inputs
#
B1 Oil Sump Pressure
Oil Supply Pressure to Compressor
B2
B3 Evaporator Refrigerant Pressure
B4 Oil Sump Temperature
B5 Compressor Suction Temperature
B6 Condenser Refrigerant Pressure
B7 Compressor Discharge Temperature
B8 Motor Current
Oil Feed Temperature
B9
B10 Leaving Evaporator Water Temperature
Table 6, Compressor Controller, Digital Inputs
#
ID1 Manual Off
ID2 Mech High Pressure
ID3 Motor High Temperature
Vanes Closed Switch
ID4
ID5 Starter Transition
ID6 Starter Fault
Evap Flow
ID7
ID8 Cond Flow
ID9 Vanes Open Switch
8
Description
Primary Evaporator Water Pump
Standby Evaporator Water Pump
Primary Condenser Water Pump
Standby Condenser Water Pump
Tower Fan #1
Tower Fan #2
(unused)
Alarm
Tower Fan #3
Tower Fan #4
Description
Description
Load Output OFF
Pump Contactor Pump OFF
Pump Contactor Pump OFF
Pump Contactor Pump OFF
Pump Contactor Pump OFF
Fan Contactor Fan OFF
Fan Contactor Fan OFF
Alarm Indicator Alarm OFF
Fan Contactor Fan OFF
Fan Contactor Fan OFF
Output Signal
0 to 10 VDC
0 to 10 VDC
0 to 10 VDC
Signal Source
0.5 to 4.5 VDC
0.5 to 4.5 VDC
0.1 to 0.9 VDC
NTC Thermister (10k@25° C)
NTC Thermister (10k@25° C)
0.5 to 4.5 VDC
NTC Thermister (10k@25° C)
0.5 to 4.5 VDC
NTC Thermister (10k@25° C)
NTC Thermister (10k@25° C)
Signal
0 VAC (Off)
0 VAC (High Pressure )
0 VAC (High Temp)
0 VAC (Not Closed)
0 VAC (No Transition)
0 VAC (Fault)
0 VAC (N0 Flow)
0 VAC (N0 Flow)
0 VAC (Not Open)
Output ON
Pump ON
Pump ON
Pump ON
Pump ON
Fan ON
Fan ON
Alarm ON
Fan ON
Fan ON
Range
0 to 100% Open
0 to 100%
0 to 100% Open
Range
0 to 150 psi
0 to 450 psi
0 to 150 psi
-58 to 212° F
-58 to 212° F
0 to 450 psi
-58 to 212° F
0 to 125% RLA
-58 to 212° F
-58 to 212° F
Signal
24 VAC (Auto)
24 VAC (OK)
24 VAC (OK)
24 VAC (Closed)
24 VAC (Transition)
24 VAC (No Fault)
24 VAC (Flow)
24 VAC (Flow)
24 VAC (Open)
OM Centrif Micro ΙΙ-5