115
RTAA-IOM-3
Table 18
Diagnostics and Troubleshooting Chart (Continued)
DIAG. ACTIVE
CODE DIAGNOSTIC DESCRIPTION TYPE MODES CAUSE
1Ad Memory Error Type I IFW UCM Power Up or a. On UCM power up or following a
Following a Type II Type II Memory Error a NOVRAM
Memory Error memory error was detected. The UCM
is operating on all Engineering ROM
defaults for all setup parameters.
Check all I setup parameters and
continue to run chiller. Replace the
Chiller Module as soon as a
replacement is available.
1AE Low Diff. Pressure - Circuit 1 CMR Compressor Energized a. The fan control algorithm detected a
low differential temperature/ pressure
condition that existed for more than
180 contiguous seconds. The trip-
point is 40 PSID.
1AF Low Diff. Pressure - Circuit 2 CMR Compressor Energized Same as diagnostic 1AE.
1b2 Severe Phase Unbalance - CMR All Running Modes a. A 30% Phase Unbalance diagnostic
Compressor A has been detected. The 15% Phase
Unbalance criteria has been defeated.
Items to check are the Current
Transformer Part Numbers (they
should all match), The Current
Transformer resistances, line voltage
phase balance, all power wiring
connections, the contactor pole faces,
and the motor.
1b3 Severe Phase Unbalance - CMR All Running Modes Same as diagnostic 1b2.
Compressor B
1b4 Severe Phase Unbalance - CMR All Running Modes Same as diagnostic 1b2.
Compressor C
1b5 Severe Phase Unbalance - CMR All Running Modes Same as diagnostic 1b2.
Compressor D
1b6 Overload Setting - IFW All a. The CPM NovRam Based overload
Compressor A setting did not agree with the MCSP
Dip Switch overload setting for 30
contiguous seconds. The affected
MCSP shall use the minimum (00000
binary, 00 decimal) overload setting as
a default until the UCM is reset when
this diagnostic occurs.
1b8 Overload Setting - IFW All Same as diagnostic 1b6.
Compressor C
1b9 Overload Setting - IFW All Same as diagnostic 1b6.
Compressor D
1bA Phase Unbalance - CMR All Running Modes a. A 15% phase unbalance has been
Compressor A detected. Menu Item “47” is enabled.
1bb Phase Unbalance - CMR All Running Modes Same as diagnostic 1bA.
Compressor B
1bC Phase Unbalance - CMR All Running Modes Same as diagnostic 1bA.
Compressor C
1bd Phase Unbalance - CMR All Running Modes Same as diagnostic 1bA.
Compressor D
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