Diagnostic Table
RTHC-SVD01B-EN 99
Momentary
Power Loss
MAR
immediate
Starter
1U2
All Running
Modes
The current transformers experienced a
loss of power. This protection can be
defeated in the Service settings, Field
Startup Group .
Check incoming power.
Check operation of
HPC. Check Starter
module.
MPL Detect
Circuit
Inoperative
MMR
friendly
Starter
1U2
All Internal component in Starter module
detecting a fault.
A failure was detected in the Momentary
Power Loss detect circuit. If there are no
zero cross interrupts on Vab for 637.5 msec
(Prior to Centravac Upgrade 4: approx. 3
half line cycles), the timer interrupt will trip
and generate a diagnostic that indicates
that our ability to detect MPL is gone. If
Vab was truely gone the module would be
powered down so if we can detect that Vab
is gone then there must be a hardware
failure on the board.
Replace the Starter
module.
No Diff Rfgt
Press, Cold
Cond Water
MMR
immediate
Chiller
1U1
Cprsr
Energized
Differential Rfgt Pressure switch sensing
system differential, is set to close @ 7.7,
open @ 6 psid. Switch is ignored during
the non-running modes but checked to be
open at time of an attempted start. If not
open, restart will be delayed and a different
diagnostic may result (see Diagnostic E8
below). The switch is ignored for the first
20 seconds of compressor operation after
start. Thereafter the switch must be proven
closed (i.e. system dp greater than 8 PSID)
with a 10 second filter implemented (initial
value @ t=20s set to trip) or immediate
shutdown and diagnostic results. The
occurrence of this diagnostic will cause the
"Low Diff Rfgt Press Integral" to saturate.
This provides for a restart inhibit and
compressor cool-down if the diagnostic is
immediately reset.
Check Condenser
Water Temp Too Low
Table 14-2: Diagnostic Table
Diagnostic
Description
Type/
Shutdown
Action
Module
Calling
Out Diag.
Operating
Modes
Diagnostic is
Active
Cause Help Message
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