Trane RTHC - Page 107

Diagnostic Table
RTHC-SVD01B-EN 101
Phase
Reversal
MMR
immediate
Starter
1U2
Contactor
energized to
transition
command
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 seconds from
compressor start for RTHB.
Check main power
supply & wiring. Check
current transformers.
Phase
Reversal
Protection Lost
MMR
immediate
Starter
1U2
Starter
Contactor
energized to
transition
command
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
Starter
1U2
Contactor
energized to
transition
command
Diagnostic is not applicable for RTHC.
Jumper must be installed on the Starter
module between J3-1 and 2.
Check wiring and
module.
Severe Phase
Unbalance
MMR
friendly
Starter
1U2
All Running
Modes
A 30% Phase Unbalance diagnostic has
been detected.
Check the current
transformers. Check line
voltage phase balance,
all power wiring
connections, the
contactors and the
motor. Check Starter
module.
Solid State
Starter Fault
Relay Open
MMR
immediate
Starter
1U2
Pre-start and
Running
Modes
The SSS fault relay is open. See Solid State Starter
Service Bulletin, check
for an open wire.
Starter
Contactor
Interrupt
Failure
MMR
n/a
Sarter
1U2
Starter
Contact not
Energized
Welded starter contactor. Detected a
welded compressor contactor when the
compressor was commanded off but the
current did not go to zero. Detection time
shall be 5 second minimum and 10
seconds maximum.
Complete starter
checkout required.
Table 14-2: Diagnostic Table
Diagnostic
Description
Type/
Shutdown
Action
Module
Calling
Out Diag.
Operating
Modes
Diagnostic is
Active
Cause Help Message