96
AC-SVX001A-EN
Table 27. Diagnostics — main processor (continued)
Diagnostic
Name
Affects
Target
Severity
Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
Low Oil Return
or AFD Cooling
– Ckt1
Circuit Info NonLatch
All Ckt Running
Modes
The evaporator’s spillover tank refrigerant liquid
level, which feeds the oil return and drive cooling
heat exchanger, is seen to be less than 90% of its
min level for 20 continuous minutes – reset when
level gets to 88% of min level. The occurrence of this
warning in conjunction with the “Loss of Oil
(Running)” or any of the” AFD Over Temp” shutdown
diagnostics, suggests either EXV problems or loss of
charge is a contributing factor
Low Oil Return
or AFD Cooling
– Ckt2
Circuit Info NonLatch
All Ckt Running
Modes
The evaporator’s spillover tank refrigerant liquid
level, which feeds the oil return and drive cooling
heat exchanger, is seen to be less than 90% of its
min level for 20 continuous minutes – reset when
level gets to 88% of min level. The occurrence of this
warning in conjunction with the “Loss of Oil
(Running)” or any of the” AFD Over Temperature”
shutdown diagnostics, suggests either EXV problems
or loss of charge is a contributing factor
Motor Winding
Temp Sensor -
Cprsr1A
Circuit Info or None Latch All
Both of the motor winding temperature sensors are
seen to be out of their normal range. (Severity is
adjustable via TU Service Tool – default is Info)
Local
Motor Winding
Temp Sensor-
Cprsr2A
Circuit Info or None Latch All
Both of the motor winding temperature sensors are
seen to be out of their normal range. (Severity is
adjustable via TU Service Tool – default is Info)
Local
MP Application
Memory CRC
Error
Chiller Immediate Latch All Modes
Memory error criteria TBD
Remote
MP: Could not
Store Starts
and Hours
None Info Latch All
MP has determined there was an error with the
previous power down store. Starts and Hours may
have been lost for the last 24 hours
Remote
MP: Invalid
Configuration
None Immediate Latch All
MP has an invalid configuration based on the current
software installed
Remote
MP: Non-
Volatile
Memory
Reformat
None Info Latch All
MP has determined there was an error in a sector of
the Non-Volatile memory and it was reformatted.
Check settings
Remote
MP: Reset Has
Occurred
None Info NonLatch All
The main processor has successfully come out of a
reset and built its application. A reset may have been
due to a power up, or a power loss of a minimum or
longer duration to cause an MP power down reset, or
when installing new software or defining a new
configuration. This diagnostic is immediately and
automatically cleared and thus can only be seen in
the Historic Diagnostic List in TU
Remote
No Differential
Rfgt Pressure –
Ckt1
Circuit Immediate Latch
Compressor
running on
Circuit
The system differential pressure was below 7.7 Psid
(53 kPa) for 6 seconds after the 11 seconds ignore
time relative to cprsr/circuit startup had expired
Remote
No Differential
Rfgt Pressure –
Ckt2
Circuit Immediate Latch
Compressor
running on
Circuit
The system differential pressure was below 7.7 Psid
(53 kPa) for 6 seconds after the 11 seconds ignore
time relative to cprsr/circuit startup had expired
Remote
DDiiaaggnnoossttiiccss
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