102
AC-SVX003A-EN
Table 30. Diagnostics — Starter (continued)
Diagnostic
Name and
Source
Affects
Target
Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Power Loss - xy Cprsr
Immediate NonLatch
All compressor
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
Immediate 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, and 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. 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.
Local
Starter Did Not
Transition - xy
Cprsr
Immediate Latch
On the first check
after transition
The Starter Module did not receive a transition complete
signal in the designated time from its command to
transition. The Must Hold time from the Starter Module
transition command is 1 second. The Must Trip time from
the transition command is 6 seconds. Actual design is 2.5
seconds. This diagnostic is active only for Y-Delta, Auto-
Transformer, Primary Reactor, and X-Line Starters.
Local
Starter Dry Run
Test - xy
Cprsr
Immediate Latch
Starter Dry Run
Mode
While in the Starter Dry Run Mode either 50 % Line Voltage
was sensed at the Potential Transformers or 10 % RLA
Current was sensed at the Current Transformers.
Local
Starter Failed to
Arm/Start - xy
Cprsr
Immediate Latch All
Starter failed to arm or start within the allotted time (15
seconds).
Local
Starter Fault Type I
- xy
Cprsr
Immediate Latch
Starting - Y Delta
Starters Only
This is a specific starter test where 1M(1K1) is closed first
and a check is made to ensure that there are no currents
detected by the CT's. If currents are detected when only 1M
is closed first at start, then one of the other contactors is
shorted.
Local
Diagnostics
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