Trane CVRC-M-1D Manual page 107

Diagnostic Description Diag Type
Right Monitor Level 3
IFW
Refrigerant Alarm
Refrigerant Monitor
IFW
Auxiliary Alarm
Refrigerant Monitor Level 2
IFW
Refrigerant Alarm
Refrigerant Monitor Level 1
IFW
Refrigerant Alarm
Severe Phase Unbalance MMR
Solid State Starter Fault
MMR
Relay Open
Starter Contactor Interrupt
MMR
Failure
Starter did not Transition MMR
Starter Dry Run Test MMR
CVRC-M-1D
Diagnostics Tables
Diag Active
Modes
Cause
(Non-Active
Modes)
The Refrigerant Monitor has read a refrigerant concentration
All
greater or equal to level 3 setpoint.
The Refrigerant Monitor auxiliary input signal indicates an alarm
All
condition.
The Refrigerant Monitor has read a refrigerant concentration
All
greater or equal to the level 2 setpoint.
The Refrigerant Monitor has read a refrigerant concentration
All
greater or equal to the level 1 setpoint.
25% Phase Unbalance diagnostic has been detected. Items to
check are the current Transformer Part Number (they should all
All Running
match), the Current Transformer resistance, line voltage phase
Modes
balance, all power wiring connections, the contactor pole faces
and the motor. If all these are OK, replace the Starter module.
Any Start and
The SSS fault relay is Open.
Run Mode
a. Welded Starter contactor.
b. Detected a welded Compressor contactor when the
compressor was commanded off but the current did not go to
Starter Contact
zero. Detection time shall be 5 seconds minimum and 10
not Energized
seconds maximum for all Electromechanical and Solid State
(Starter Contact
Starters. Detection time for Variable Speed Drives shall be 12
Energized)
seconds minimum and 17 seconds maximum. On detection,
generate the diagnostic, energize the appropriate alarm relay,
continue to command the affected compressor off.
a. The UCM did not receive a transition complete signal in the
designated time from the UCM command to transition. The must
On the first hold time from the UCM transition command is 1 second. The
check after must trip time from the transition command is 6 seconds. Actual
transition design is 2.5 seconds.
b. Item a. Above is active only for Y-delta, Auto-transformer, and
Primary Reactors Starters.
While in the Starter Dry Run Mode either 50% Line Voltage was
Starter Dry Run
sensed at the Potential Transformers or 10% RLA Current was
Mode
sensed at the Current Transformers.
Help Message
N/A
N/A
N/A
N/A
Check Main Power
Supply and Wiring
See Solid State
Starter Service
Bulletin
Complete Starter
Checkout Required
Complete Starter
Checkout Required
Current or Voltage
Detected
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