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9.0 DIAGNOSTICS & TROUBLESHOOTING
Diagnostics
9.4 Active Protection Fault Details (cont.)
16 – HP Sensor Not Configured – T926_O
If the inverter is not configured or does not hold
the configuration for the high pressure switch in the
Modbus register, the inverter will provide this fault.
L16 – Brown Out Fault – A959_O Brown Out Fault
If the inverter detects input AC voltage < 155VAC
for 4 seconds the VSODC will automatically shut
the compressor off and keep it from operation. The
VSODC will leave the compressor off until the input
AC voltage increases to >175VAC for 4 seconds.
At this time the VSODC will restart the compressor.
While the compressor is off the VSODC will display a
16 on the dual 7-segment LEDs
.
IMPORTANT:
This mode of active
protection is automatically reset.
L21 – Low Pressure Refrigerant – A/T 021_0 Low
Refrigerant Pressure
•
The VSODC will display a flashing “21” followed by
a flashing “L” when a low-pressure control lockout
occurs.
IMPORTANT:
This mode of active
protection must be manually reset.
• If the LPC opens three (3) times during the same call
for cooling operation, the VSODC will lock out the
compressor to keep it from continuing to operate and
flash a “21” on the dual 7-segment LEDs followed by
an “L.”
IMPORTANT:
This mode of active
protection must be manually reset.
27- AC Input Under Voltage – A907_O_Inverter
Fault
If the inverter detects input AC under voltage the
VSODC will automatically shut the compressor off
and keep it from operation. The VSODC will leave the
compressor off until the input AC voltage increases
to
≥
187VAC. At this time the VSODC will restart the
compressor. While the compressor is off the VSODC
will display a 27 on the dual 7-segment LEDs.
IMPORTANT:
This mode of active
protection is automatically reset.
28 – AC Input Over Voltage – A906_O Inverter
Fault
If the inverter detects input AC over voltage the
VSODC will automatically shut the compressor off
and keep it from operation. The VSODC will leave
the compressor off until the input AC voltage reduces
to
≤
252VAC. At this time the VSODC will restart the
compressor. While the compressor is off the VSODC
will display a 28 on the dual 7-segment LEDs.
IMPORTANT:
This mode of active
protection is automatically reset.
L29 – High Refrigerant Pressure – A/T 923_O
High Refrigerant Pressure
• If the HPC opens three (3) times during the same
call for unit operation, the VSODC will lock out the
compressor to keep it from continuing to operate and
flash a “29” on the dual 7-segment LEDs followed by
an “L.”
IMPORTANT:
This mode of active
protection must be manually reset.
31 – Compressor Envelope Protection- T902_O
Inverter Fault – Envelope Protection
If the inverter detects the calculated compressor
torque is greater than the designed operating
envelope permits the inverter will automatically begin
to slow the compressor operation. If this fold back is
not successful in bringing the compressor back into
Active Protection – Code
21L – Open low-pressure
control
Active Protection – Code
21L – Open low-pressure
control
