Afd Diagnostics - Trane RTAF-SVX001K-EN Manual

Diagnostics

AFD Diagnostics

Table 31. AFD diagnostics
Diagnostic Name and
Source
AFD Fault - xA
AFD Motor Current Overload - xA Circuit
AFD Interrupt Failure - xA
78
Affects
Severity Persistence
Target
Cprsr Immediate NonLatch
Immediate Latch
Immediate
Chiller Shutdown and Latch
Special Action
Active Modes
[Inactive
Modes]
AFD Fault. Numerous drive faults can cause
All this general fault including High Pressure
Cutout for AFD compressors.
Compressor current exceeded overload time
All vs. trip characteristic. Must trip = 132%
RLA, Must hold=125%
Respective AFD is reporting that it is still
running the compressor when the MP has
commanded the drive/compressor to be Off.
Detection time shall be 10 seconds minimum
and 15 seconds maximum. 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
AFD Intended to unloaded, while a normal stop shall be
be OFF 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
contactor 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 contactor
interrupt failure, the circuit reverts to air-
cooled condenser fan control within 1
second.
Reset
Criteria
Level
Local
Local
Local
RTAF-SVX001K-EN