Panasonic CS-E12QB4RW, Service Manual

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13. Protection Control
13.1 Protection Control For All Operations
13.1.1 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.
13.1.2 Total Running Current
1 When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor
operation will be decreased.
2 If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.
3 However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for
3 minutes.
Model E12QB4R E18QB4R
Operation Mode X (A) Y (A) X (A) Y (A)
Cooling / Soft Dry (A) 6.13 10.07
Cooling / Soft Dry (B) 5.87 8.82
Cooling / Soft Dry (C) 5.87 8.05
Heating 7.23
14.98
9.99
14.67
4 The first 30 minutes of cooling operation, (A) will be applied.
13.1.3 IPM (Power transistor) Prevention Control

Overheating Prevention Control
1 When the IPM temperature rises to 120°C, compressor operation will stop immediately.
2 Compressor operation restarts after 3 minutes the temperature decreases to 110°C.
3 If this condition repeats continuously 4 times within 20 minutes, timer LED will be blinking (“F96” is indicated).

DC Peak Current Control
1 When electric current to IPM exceeds set value of 20.23 (E12), 30.0 (E18) ± 5.0A, the compressor will stop
operate. Then, operation will restart after 3 minutes.
2 If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will
restart after 1 minute.
3 If the set value exceeded 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, timer
LED will be blinking (“F99” is indicated).