McQuay Magnitude WMC 145SBS - 400DBS, Руководство по эксплуатации и техническому обслуживанию

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24 OMM 1008-1
Compressor Faults, Problems, Warnings
Faults (Equipment Protection Shutdowns)
Equipment protection faults cause rapid compressor shutdown. The compressor is stopped immediately (if
the compressor was running).
The following table identifies each alarm, gives the condition that causes the alarm to occur, and states the
action taken because of the alarm. All equipment protection alarms require a manual reset.
These faults are accessed by first selecting Comp 1 or Comp 2 on the controller screen
Table 13, Compressor Faults (Equipment Protection Shutdowns)
Description Occurs When: Action Taken
Low Evaporator Pressure Evaporator Press < Low Evap Pressure SP Rapid Stop
High Condenser Pressure Cond Press > High Condenser Pressure SP Rapid Stop
Low Motor Current I < Motor Current Threshold with Compressor ON for 30 sec Rapid Stop
High Discharge Temperature Temp > High Discharge Temperature SP Rapid Stop
Mechanical High Pressure Digital Input = High Pressure Rapid Stop
High Motor Temperature Digital Input = High Temperature Rapid Stop
Surge High Suct SH-Starting
Temp > Surge High Suct SH-Start SP during first 5 minutes
of Compressor ON
Rapid Stop
Surge High Suct SH-Running
Temp > Surge High Suct SH-Run SP after first 5 minutes of
Compressor ON
Rapid Stop
No Compressor Stop
%RLA > Motor Current Threshold SP with Compressor OFF
for 30 sec
Annunciation
Starter Fault
Starter Fault Digital Input = Fault AND Compressor State =
START, INTLOK, RUN, or UNLOAD
Rapid Stop
Leaving Evaporator Water
Temperature Sensor Fault
Sensor shorted or open Rapid Stop
Evaporator Pressure Sensor Fault Sensor shorted or open Rapid Stop
Condenser Pressure Sensor Fault Sensor shorted or open Rapid Stop
Suction Temperature Sensor Fault Sensor shorted or open Rapid Stop
Discharge Temperature Sensor
Fault
Sensor shorted or open Rapid Stop
Evaporator Water Flow Loss Evaporator Flow DI = No Flow for > 10 sec Rapid Stop
Condenser Water Flow Loss Condenser Flow DI = No Flow for > 10 sec Rapid Stop
Compressor Events (Limit Alarms)
The following alarms do not cause compressor shutdown but limit operation of the chiller as described in the
Action Taken column.
Table 14, Compressor Events
Description Occurs When: Action Taken Automatic Reset
Low Evaporator Pressure
– Inhibit Loading Pressure < Low Evap Pressure–Inhibit
setpoint
Inhibit loading
Evap Press rises above
(SP + 3psi)
Low Evaporator Pressure
– Unload Pressure < Low Evap Pressure–Unload
setpoint
Unload
Evap Press rises above
(SP + 3psi)
Evaporator Freeze
Protect Evap Sat Refr Temp < Evaporator Freeze
setpoint
Start evaporator
pump
Temp > (Evaporator Freeze
SP + 2°F)
Condenser Freeze
Protect Cond Sat Refr Temp < Condenser Freeze
Setpoint
Start condenser
pump
Temp > (Condenser Freeze
SP + 2°F)
High Discharge
Temperature
Temperature > High Discharge
Temperature-Load SP AND
Suction superheat < 15°F
Load
Temp < (High Dsch Temp
Load SP – 3°F) OR
Superheat > 18°F