112
RTAA-IOM-3
Table 18
Diagnostics and Troubleshooting Chart (Continued)
DIAG. ACTIVE
CODE DIAGNOSTIC DESCRIPTION TYPE MODES CAUSE
d8 Under Voltage MAR Pre-start and a. Line voltage below -10% of nominal
Any Circuit(s) Energized the Under/Over transformer is not
connected. (Must hold = -10% of
nominal Must trip = -15% of nominal).
Ed Chilled Water Flow Interlock MAR All Modes Except a. The chilled water flow switch input
STOP (00) and was open for more than 6 seconds.
EXTERNAL STOP (100)
F5 High Pressure Cutout - CMR All a. A high pressure cutout was detected
Compressor A on Compressor A; trip at 405 + or
- 7 PSIG.
F6 High Pressure Cutout - CMR All a. A high pressure cutout was detected
Compressor B on Compressor B; trip at 405 + or
- 7 PSIG.
Fd Emergency Stop MMR All a. EMERGENCY STOP input is open.
An external interlock has tripped.
Time to trip from input opening to unit
stop shall be 0.1 to 1.0 sec.
180 Starter Transition CMR a. The UCM did not receive a
Compressor A transition complete signal in the
designated time from the UCM
command to transition. The must
hold time from the UCM transition
command is 1 second. The Must trip
time from the transition time is 6
seconds.
b. The Transition Complete input was
found to be shorted before the
compressor was started.
c. Active only if Reduced Inrush
Starting is enabled.
181 Starter Transition - Compressor B CMR Same as 180 Same as diagnostic 180.
182 Starter Transition - Compressor C CMR Same as 180 Same as diagnostic 180.
183 Starter Transition - Compressor D CMR Same as 180 Same as diagnostic 180.
184 Phase Reversal - Compressor A CMR 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 1.0 second from
compressor start.
185 Phase Reversal - Compressor B CMR Same as diagnostic 184.
186 Phase Reversal - Compressor C CMR Same as diagnostic 184.
187 Phase Reversal CMR Same as diagnostic 184.
Compressor D
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