
Diagnostics
RTAF-SVX001K-EN
79
Starter Diagnostics
Table 32. Starter diagnostics
Diagnostic Name and
Source
Affects
Target
Severity Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
Motor Current Overload - xy
Circuit Immediate
Latch
Cprsr
Energized
Compressor current exceeded overload time vs.
trip characteristic. Must trip = 140% RLA, Must
hold=125%, nominal trip 132.5% in 30 seconds
Local
Over Voltage
Chiller
Normal
NonLatch
Pre-Start and
Any Ckt(s)
Energzd
Nom. trip: 60 seconds at greater than 112.5%, ?
2.5%, Auto Reset at 110% or less for 10 cont secs.
Remote
Phase Loss - xy
Cprsr
Immediate
Latch
Start Sequence
and Run modes
a) No current was sensed on one or two of the
current transformer inputs while running or
starting (See Nonlatching Power Loss Diagnostic
for all three phases lost while running).
Must hold = 20% RLA. Must trip = 5% RLA. Time
to trip shall be longer than guaranteed reset on
Starter Module at a minimum, 3 seconds
maximum. Actual design trip point is 10%. The
actual design trip time is 2.64 seconds. b) If Phase
reversal protection is enabled and current is not
sensed on one or more current xformer inputs.
Logic will detect and trip in a maximum of 0.3
seconds from compressor start.
Local
Phase Reversal - xy
Cprsr
Immediate
Latch
Compressor
energized to
transition
command [All
Other Times]
A phase reversal was detected on the incoming
current. On a compressor startup, the phase
reversal logic must detect and trip in a maximum
of 0.3 second from compressor start.
Local
Power Loss - xy
Cprsr
Immediate
NonLatch
All compressor
running modes
[all compressor
starting and
non-running
modes]
The compressor had previously established
currents while running and then all three phases
of current were lost. Design: Less than 10% RLA,
trip in 2.64 seconds. This diagnostic will preclude
the Phase Loss Diagnostic and the Transition
Complete Input Opened Diagnostic from being
called out. To prevent this diagnostic from
occurring with the intended disconnect of main
power, the minimum time to trip must be greater
than the guaranteed reset time of the Starter
module. Note: This diagnostic prevents nuisance
latching diagnostics due to a momentary power
loss – It does not protect motor/compressor from
uncontrolled power reapplication. See Momentary
Power Loss Diagnostic for this protection. This
diagnostic is not active during the start mode
before the transition complete input is proven.
Thus a random power loss during a start would
result in either a “Starter Fault Type 3” or a
“Starter Did Not Transition” latching diagnostic.
Remote
Severe Current Imbalance xy
Circuit Immediate
Latch
All Running
Modes
A 30% Current Imbalance has been detected on
one phase relative to the average of all 3 phases
for 90 continuous seconds.
Local
Starter Comm Loss: Main
Processor - xy
Cprsr
Immediate
Latch
All
The Starter module detected a continual loss of
communication with the main processor for
greater than the Communications Loss Time
bound setpoint.
Local