DESCRIPTION OF INPUTS / OUTPUTS
ANALOGUE INPUTS
Probes
1. CONTROL : used as the main controlling probe based on which the setpoint will
regulate the system.
2. Condenser Inlet : Senses Condenser Inlet temperature
3. Condenser Outlet: Senses Condenser Outlet temperature.
4. Water Inlet : Senses Water (CHILLER) Inlet temperature
5. Water Outlet : Senses Water (CHILLER) Outlet temperature
6. Antifreeze : Used to trip compressors below AFT set point .
DIGITAL INPUTS
Controller manages the following protections :
- High Pressure trip for the compressor1(HP1)
- Low Pressure Trip for the compressor1.(LP1)
- Compressor Overload trip1(COMP O/L1)
- OSS - Oil Safety Switch (OSS1)
- Single Phase Preventor Trip1(SPP1)
- High Pressure trip for the compressor2(HP2)
- Low Pressure Trip for the compressor2.(LP2)
- Compressor Overload trip2(COMP O/L2)
- OSS - Oil Safety Switch (OSS2)
- Single Phase Preventor Trip2(SPP2)
- High Pressure trip for the compressor3(HP3)
- Low Pressure Trip for the compressor3.(LP3)
- Compressor Overload trip3(COMP O/L3)
- OSS - Oil Safety Switch (OSS3)
- Single Phase Preventor Trip3(SPP3)
- Condenser Fan1 O/L Trip (FAN O/L1 )
- Condenser Fan2 O/L Trip (FAN O/L2 )
- Condenser Fan3 O/L Trip (FAN O/L3 )
- Pump Overload Trip
- Evaporator Water Flow Switch Trip
The controller informs the user of a fault condition via a buzzer and an ALARM-
RELAY.
DIGITAL OUTPUTS (RELAY)
1. Chiller Pump
2. Compressor1
3. Condenser Fan1
4. Compressor2
5. Condenser Fan2
6. Compressor3
7. Condenser Fan3
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