Trane Optimus RTHD - Continued Starter Diagnostics

RTHD-SVX01L-EN
73
Table 21. Starter diagnostics (continued)
Diagnostic Name
Affects
Target
Severity
Persistence
Active Modes
[Inactive Modes]
Criteria
Reset
Level
Motor Current
Overload
Chiller Immediate Latch
Chiller Energized
Compressor current exceeded overload time vs. trip
characteristic. For Water Cooled products Must trip = 112%
RLA, Must hold=102%, nominal trip 107% in 20 seconds
Local
Over Voltage
Chiller Normal NonLatch All
a. Average of all monitored Line voltages above + 10% of
nominal. [Must hold = + 10 % of nominal. Must trip = + 15 %
of nominal. Reset differential = min. of 2% and max. of 4%.
Time to trip = minimum of 1 min. and maximum of 5 min.)
Design: Nom. Trip: 60 seconds at greater than 112.5%,
±2.5%, Auto Reset at 109% or less.
Remote
Phase Loss Chiller 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 transformer
inputs. Logic will detect and trip in a maximum of 0.3
second from compressor start.
Local
Phase Reversal Chiller 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 Chiller 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 will auto reset
in 10 seconds from its occurrence and is not active during
the start mode before the transition complete input is
proven. This prevents the chiller from cycling due to some
internal starter problem, as the starter would latch out on
either a “Starter Fault Type 3” or a “Starter Did Not
Transition” latching diagnostic. However true power loss
occurring during a start would result in a misdiagnosis and
the chiller would not automatically recover.
Remote
Severe Current
Imbalance
Chiller Normal 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
Solid State Starter
Fault
Chiller Immediate Latch All
The Solid State Starter Fault Relay is open
Local
Diagnostics