104
AC-SVX003A-EN
Table 31. Diagnostics — main processor (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
AFD Interrupt
Failure - xA
Chiller
Immediate
Shutdown and
Special Action
Latch
AFD Intended to
be OFF
Respective AFD is reporting that it is still running the
compressor when the MP has commanded the drive/
compressor to be Off. This diagnostic is triggered if the AFD
running status remains in running for more than 16 seconds
after the MP initiates the OFF command. On detection and
until the controller is manually reset: this diagnostic shall be
active and the alarm relay shall be energized, the Evap
Pump Output will be energized, the effected compressor
will be continually commanded off, and be unloaded, while
a normal stop shall be commanded to all other
compressors. For as long as compressor operation
continues, the MP shall continue oil return and fan control
on the circuit affected. During AFD interrupt failure, circuit
will not be confirmed off, so THR unit sequence should
continue running. If THR turns off due to a diagnostic or
lockout during AFD interrupt failure, the circuit reverts to air-
cooled condenser fan control within 1 second.
Local
AFD Unexpected
Shutdown - xA
Cprsr
Normal NonLatch
Running
The AFD status reported back that it is stopped when the
MP thinks it should be running and no AFD diagnostic
exists. This diagnostic will be logged in the active buffer and
then automatically cleared. This diagnostic could be caused
by intermittent communication problems from the AFD to
the MP or due to mis-binding. Note: This is a Controller
diagnostic, not one originating from the AFD.
Local
Chiller Service
Recommended
Chiller
Warning
Latch
Service
Messages
Enabled
Chiller service interval time has elapsed. Chiller service is
recommended.
Remote
Compressor
Discharge
Refrigerant
Temperature
Sensor - xy
Cprsr
Immediate Latch All Bad Sensor or LLID Remote
Condenser
Refrigerant
Pressure Sensor
Circuit Immediate Latch All Bad Sensor or LLID Remote
Emergency Stop
Feedback Input
Chiller Immediate Latch All
A. Emergency stop feedback input is open. An external
interlock has tripped. Time to trip from input opening to unit
stop shall be 0.1 to 1.0 seconds.
Local
Evap Water
Pump 1 Svc
Recommended
Chiller
Warning
Latch
Service
Messages
Enabled
Pump service recommended as service interval hours have
elapsed.
Remote
Evaporator
Approach Error
Circuit Immediate Latch
Respective
circuit running
The Evaporator approach temperature for the respective
circuit (ELWT – Evap Sat Temp Ckt x) is negative by more
than 10°F for 1 minute continuously while the circuit /
compressor is operating. Either the Evap Leaving Water
Temp sensor or Evap Suction Rfgt Pressure Sensor Ckt x is
in error.
Remote
Evaporator Diff
Water Pressure
Xdcr
Chiller
Warning
Latch All
Bad Sensor or LLID
a. Display invalid value
b. Flow calculation shall be disabled.
See Water_Flow_and_Tons_Sensing.doc specification for
additional information
Remote
Evaporator
Entering Water
Pressure
Chiller
Warning
Latch All
Bad Sensor or LLID
a. Display invalid value
b. Flow calculation shall be disabled.
See Water_Flow_and_Tons_Sensing.doc specification for
additional information
Remote
Diagnostics
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