Panasonic CS-PS9JKT, Service Manual

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12. Protection Control
12.1 Restart Control (Time Delay Safety Control)
•
The compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on
again by pressing OFF/ON button at remote control within this period.
•
This control is not applicable if the power supply is cut off and on again.
•
This phenomenon is to balance the pressure inside the refrigerant cycle.
12.2 30 Seconds Forced Operation
•
Once the air conditioner is turned on, the compressor will not stop within 30 seconds in a normal operation
although the intake air temperature has reached the thermo-off temperature. However, force stop by pressing the
OFF/ON button at the remote control is permitted or the Auto OFF/ON button at indoor unit.
•
The reason for the compressor to force operation for minimum 30 seconds is to allow the refrigerant oil run in a
full cycle and return back to the outdoor unit.
12.3 Total Running Current Control
•
When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor
operation will be decreased.
•
If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.
•
However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for 3
minutes.
Model PS9*** PS12***
Operation Mode X (A) Y (A) X (A) Y (A)
Cooling / Soft Dry (A) 5.5 15.0 7.3 15.0
Cooling / Soft Dry (B) 4.9 15.0 6.7 15.0
•
The first 30 minutes of cooling operation, (A) will be applied.
12.4 IPM (Power Transistor) Prevention Control
•
Overheating Prevention Control
o
When the IPM temperature rises to 100°C, compressor operation will stop immediately.
o
Compressor operation restarts after 3 minutes the temperature decreases to 95°C.
•
DC Peak Current Control
o
When electric current to IPM exceeds set value of 18.5A, the compressor will stop operate. Then, operation
will restart after 3 minutes.
o
If the set value exceeds again more than 30 seconds after the compressor starts, the operation will restart
after 2 minutes.
o
If the set value exceeds again within 30 seconds after the compressor starts, the operation will restart after 1
minute. If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off.
(B)
(A)
Outdoor air temperature
38.5°C
37.5°C