Diagnostics
68
RTAF-SVX001A-EN
Starter Diagnostics
Table 26.
Starter diagnostics
Diagnostic
Name and
Source
Affects
Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Compressor
Did Not
Accelerate:
Shutdown -
xy
Cprsr
Immediate Latch
Cprsr
Accelerating
Acceleration Time Out Action set to Shutdown: Compressor motor
current did not drop below 85% RLA within the Maximum Acceleration
Setting setpoint. Compressor motor de-energized. See Current
Overload Protection specification.
Local
Compressor
Did Not
Accelerate:
Transition -
xy
Cprsr
Info
Latch
Start Mode
The compressor did not come up to speed (fall to <85%RLA) in the
allotted time defined by the Maximum Acceleration Timer and a
transition was forced (motor put across the line) at that time. This
applies to all starter types.
Remote
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
Starter
Contactor
Interrupt
Failure – xy
Chiller
Info and
Special
Action
Latch
Starter
Contactor not
Energized
[Starter
Contactor
Energized]
Detected compressor currents greater than 10% RLA on any or all
phases when the compressor was commanded off. Detection time shall
be 5 second minimum and 10 seconds maximum. On detection and
until the controller is manually reset: generate diagnostic, energize the
appropriate alarm relay, continue to energize the Evap Pump Output,
continue to command the affected compressor off, fully unload the
effected compressor and command a normal stop to all other
compressors. For as long as current continues, perform liquid level, oil
return, and fan control on the circuit effected.
Local
