Installation, Operation and Maintenance 10 - 9
Over Voltage MAR Friendly a. Line voltage above + 10% of nominal. (Must hold = + 10% of
nominal. Must trip = + 15% of nominal. Reset differential = min. of
2% and max. of 4%. Time to trip = minimum of 1 min. 10 sec. and
maximum of 5 min. 20 seconds)
Design: Nom. trip: 60 seconds at greater than 112.5%, + or -2.5%,
Auto Reset at 109% or less.
Check Main Power
Supply & Wiring
Phase Loss MMR Immediate a. No current was sensed on one or more of the current transformer
inputs. (Must hold = 20% RLA. Must trip = 5% RLA.) Time to trip
shall be 1 second minimum, 3 seconds maximum. Actual design trip
point is 10%. The actual design trip time was 2.64 seconds.
Check Main Power
Supply & Wiring
Phase Reversal MMR Immediate a. A phase reversal was detected on the incoming current. On a
compressor start-up the phase reversal logic must detect and trip in
a maximum of 0.3 second from compressor start.
Check Main Power
Supply & Wiring
Phase Reversal
Protection Lost
MMR Immediate a. The phase reversal protection on the compressor has become
inoperative. The phase rotation protection system failed to detect 2
in a row of one of the four phase circuit states: Phase reversal,
Phase rotation OK, Phase A lost, Phase B lost.
Check Starter
Module.
Phase Seq
Monitor: Phase
Reversal
MMR Immediate At start-up, the Phase Sequence Monitor detected a Voltage-based
phase reversal in the compressor motor terminal box. The
combination of the Phase Sequence Monitor and the Starter Module
shall de-energize the starter within 0.3 seconds from start if a phase
reversal exists. The Phase Sequence monitor presents a Form A
(NO) contact which closes after 3 Phase Line Voltage of proper
rotation is applied. The phase sequence monitor is only used in
remote starter applications.
See
Troubleshooting
Service Bulletin
Rfgt Monitor
Auxiliary Alarm
IFW N/A The Refrigerant Monitor auxiliary input signal indicates an alarm
condition.
N/A
Rfgt Monitor Aux
Input Error
IFW N/A The Refrigerant Monitor auxiliary input is outside the 4-20 mA range. Check Signal At
Input
Rfgt Monitor
Bench Flow Loss
IFW N/A Air flow loss to the Refrigerant Monitor optical bench.
a. IFW to the chiller, MMR/MAR to the Refrigerant Monitor.
See Refrigerant
Monitor IOM
Manual
Rfgt Monitor
Calibration Error
IFW N/A The Refrigerant Monitor calibration failed.
a. IFW to the chiller, IFW to the Refrigerant Monitor.
See Refrigerant
Monitor IOM
Manual
Rfgt Monitor
Chopper
IFW N/A Refrigerant Monitor optical bench photo-interrupter failure.
a. IFW to the chiller, MAR to the Refrigerant Monitor.
Check Chopper
Wiring And
Connections
Rfgt Monitor
External Reset
IFW N/A The Refrigerant Monitor external reset switch (Normally Closed) is
stuck in the “reset” state or the switch/jumper is missing.
See Refrigerant
Monitor IOM
Manual.
Rfgt Monitor Fault IFW N/A A undefined diagnostic detected by the Refrigerant Monitor.
a. IFW to the chiller, MMR to the Refrigerant Monitor.
See Refrigerant
Monitor IOM
Manual.
Rfgt Monitor IR
Source
IFW N/A Refrigerant Monitor infrared optical source failure.
a. IFW to the chiller, MAR to the Refrigerant Monitor.
Check IR Source
Wiring And
Connections
Rfgt Monitor
Level 3 Rfgt
Alarm
IFW N/A The Refrigerant Monitor has read a refrigerant concentration greater
or equal to the level 3 setpoint.
N/A
Rfgt Monitor
Level 2 Rfgt
Alarm
IFW N/A The Refrigerant Monitor has read a refrigerant concentration greater
or equal to the level 2 setpoint.
N/A
Diagnostic
Description
Diagnostic
Type
Shutdown
Action
Cause Help Message
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