AC-SVX001A-EN
93
Table 27. Diagnostics — main processor (continued)
Diagnostic
Name
Affects
Target
Severity
Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
Low
Differential
Rfgt Pressure -
Ckt1
Circuit Immediate Latch
Cprsr
Energized
The system differential pressure (Pc-Pe) for the
respective circuit was below 15 psid (240.5 kPa) or
the pressure ratio (Pc/Pe) was less than 1.1 while the
compressor is running for a period of time dependent
on the deficit (15 sec ignore time from circuit start)
Refer to the Oil Flow Protection specification for the
time to trip function.
Remote
Low
Differential
Rfgt Pressure -
Ckt2
Circuit Immediate Latch
Cprsr
Energized
The system differential pressure (Pc-Pe) for the
respective circuit was below 15psid (240.5 kPa) or
the pressure ratio (Pc/Pe) was less than 1.1 while the
compressor is running for a period of time dependent
on the deficit (15 sec ignore time from circuit start)
Refer to the Oil Flow Protection specification for the
time to trip function.
Remote
Low Discharge
Superheat –
Ckt1
Circuit Normal Latch
Any Running
Mode
While Running Normally, the Discharge Superheat
was less than 9 degrees F for more than 4878 degree
F seconds. At circuit startup, the Discharge
Superheat will be ignored for 5 minutes
Remote
Low Discharge
Superheat –
Ckt2
Circuit Normal Latch
Any Running
Mode
While Running Normally, the Discharge Superheat
was less than 9 degrees F for more than 4878 degree
F seconds. At circuit startup, the Discharge
Superheat will be ignored for 5 minutes
Remote
Low Drive
Cooling Supply
Temp – Ckt1
Circuit Info NonLatch
All Ckt Running
Modes
The Drive Cooling Supply temperature for the
respective circuit is seen to be more than 5F cooler
than its setpoint for more than 30 minutes. Auto-
reset if temperatures return to Undesirable
condensation is possible on the cooled surfaces
inside the control panel. Inspect the Drive Cooling
System components for misoperation or failure
Low Drive
Cooling Supply
Temp – Ckt2
Circuit Info NonLatch
All Ckt Running
Modes
The Drive Cooling Supply Temperature for the
respective circuit is seen to be more than 5F cooler
than its setpoint for more than 30 minutes.
Undesirable condensation is possible on the cooled
surfaces inside the control panel. Inspect the Drive
Cooling System components for misoperation or
failure
Low
Evaporator
Rfgt Pressure -
Ckt1
Circuit Immediate Latch
Cprsr Prestart
and Cprsr
Energized
a. The Evap Refrig Pressure dropped below 10 Psia
just prior to compressor start (after EXV
preposition). b. During Early Startup Period: the
Evap Refrig Pressure fell below a pressure equal to
Condenser Pressure ÷ 8 but as limited to not less
than 6 or greater than 10 psia. c. After Early Startup
Period expires: The Evap Refrig Pressure fell below
16 Psia for 30 seconds or below 10 psia for 5
seconds. (Note: the Early Startup Period for RTAE it
is between 1 and 5 min as an inverse function of the
Cond Temp measured at time of circuit startup)
Local
DDiiaaggnnoossttiiccss
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