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9.0 DIAGNOSTICS & TROUBLESHOOTING
Diagnostics
9.4 Active Protection Fault Details
L8 – Compressor Model Unknown – A900_O
Inverter Identity Fault
If the inverter compressor model is not set, the
inverter will keep the compressor from operation.
The VSODC will lock out the compressor to keep it
from operating and flash an ”L” on the dual 7-seg
-
ment LEDs followed by a 8.
IMPORTANT:
This mode of active
protection must be manually reset
Active Protection – Code
L8 – Compressor Model
Unknown – A900_O
Inverter Identity Fault
15 – Compressor Overcurrent – T901_O Inverter
Fault
If the inverter detects an output overcurrent condi
-
tion to the compressor greater than the compressor/
inverter envelope permits, the inverter will automat
-
ically begin to slow the compressor operation and
reduce the output current. When operating with an
ECM outdoor fan motor and in cooling mode the
VSODC will increase the outdoor fan speed. When
operating in communicating and heating modes
the VSODC will request the indoor airflow to be
increased to the maximum level permissible for
the outdoor unit. If this fold back is not successful
in bringing the compressor back into the designed
operating envelope then the compressor will be kept
from operating. During either of the above condi
-
tions where the compressor has been stopped from
operating the VSODC will flash a “15” on the dual
7-segment LED.
L15 – Power Factor Correction Circuit
Overcurrent – T903_O Inverter Fault
If the inverter detects an overcurrent condition in the
power factor correction circuit the inverter will auto
-
matically shut the compressor off and keep it from
operation. There is a 5 minute delay after this fault
occurs before VSODC will restart the compressor.
If this fault occurs 3 times during a single call for
operation the VSODC will lock out the compressor to
keep it from continuing to operate and flash an ”L” on
the dual 7-segment LEDs followed by a 15.
IMPORTANT:
This mode of active
protection must be manually reset
L15 – DC Bus Over Voltage – A904_O Inverter
Fault
If the inverter detects an overvoltage condition in
the DC bus circuit the inverter will automatically
shut the compressor off and keep it from operation.
The VSODC will leave the compressor off until the
DC bus voltage drops below 380Vdc. At this time
the VSODC will restart the compressor. If this fault
occurs 3 times in one hour the VSODC will lock out
the compressor to keep it from continuing to operate
for one hour and flash an ”L” on the dual 7-segment
LEDs followed by a 15.
IMPORTANT:
This mode of active
protection must be manually reset
L15 – DC Bus Over Voltage – A905_O Inverter
Fault
If the inverter detects an under voltage condition
in the DC bus circuit the inverter will automatically
shut the compressor off and keep it from operation.
The VSODC will leave the compressor off until the
DC bus voltage rises above 300Vdc. At this time
the VSODC will restart the compressor. If this fault
occurs 3 times in one hour the VSODC will lock out
the compressor to keep it from continuing to operate
for one hour and flash an ”L” on the dual 7-segment
LEDs followed by a 15.
IMPORTANT:
This mode of active
protection must be manually reset
