RTAC-SVX002A-EN 92
Diagnostics
Hex
Code
Diagnostic Name and Source Severity Persistence Criteria Reset Level
5B0 Transition Complete Input
Opened - Compressor 1A
Immediate Latch The Transition Complete input was found to be opened with the
compressor motor running after a successful completion of transition.
This is active only for YDelta, Auto-Transformer, Primary Reactor, and
X- Line Starters. To prevent this diagnostic from occurring as the result
of a power loss to the contactors, the minimum time to trip must be
greater than the trip time for the power loss diagnostic.
Local
5B1 Transition Complete Input
Opened - Compressor
1B
Immediate Latch Same as Transition Complete Input Opened - Compressor 1A Local
5B2 Transition Complete Input
Opened - Compressor 2A
Immediate Latch Same as Transition Complete Input Opened - Compressor 1A Local
5B3 Transition Complete Input
Opened - Compressor
2B
Immediate Latch Same as Transition Complete Input Opened - Compressor 1A Local
5AC Transition Complete Input
Shorted - Compressor 1A
Immediate Latch The Transition Complete input was found to be shorted before the
compressor was started. This is active for all electromechanical
starters.
Local
5AD Transition Complete Input
Shorted - Compressor 1B
Immediate Latch Same as Transition Complete Input Opened - Compressor 2B Local
5AE Transition Complete Input
Shorted - Compressor 2A
Immediate Latch Same as Transition Complete Input Opened - Compressor 2B Local
5AF Transition Complete Input
Shorted - Compressor 2B
Immediate Latch Same as Transition Complete Input Opened - Compressor 2B Local
D8 Under Voltage Normal NonLatch a. Line voltage below - 10% of nominal or the Under/Overvoltage
transformer is not connected. [Must hold = - 10 % of nominal.
Must trip = - 15 % of nominal. Reset differential = min. of 2% and max.
of 4%. Time to trip = min. of 1 min. and max. of 5 min.) Design: Nom.
trip: 60 seconds at less than 87.5%, + or - 2.8% at 200V or + or - 1.8%
at 575V, Auto Reset at 90% or greater.
Remote
771 Very Low Evaporator
Refrigerant Pressure – Circuit 1
Immediate Latch The evaporator pressure dropped below 10 psia (or 5 psia in software
prior to Oct '02)regardless of whether or not compressors are running
on that circuit. This diagnostic was created to prevent compressor
failures due to crossbinding by forcing an entire chiller shutdown. If
a given compressor or circuit is locked out, the suction pressure
transducer(s)associated with it, will be excluded from causing this
diagnostic.
Local
772 Very Low Evaporator
Refrigerant Pressure – Circuit 2
Immediate Latch Same as Very Low Evaporator Refrigerant Pressure - Circuit 1 Local
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