Protection Control; Protection Control For All Operations - Panasonic CS-DZ50VKE Service Manual

15. Protection Control

15.1 Protection Control for All Operations

15.1.1 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.
15.1.2 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
Operation Mode X (A)
Cooling / Soft Dry (A)
Cooling / Soft Dry (B)
Cooling / Soft Dry (C)
Heating
4 The first 30 minutes of cooling operation, (A) will be applied.
15.1.3 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 16.0 ± 2.0A (DZ/PZ/UZ25/35VK) and 20.2 ± 2.7A
(DZ/PZ/UZ50VK), 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 3 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).
DZ/PZ25VK DZ/PZ35VK
Y (A) X (A) Y (A)
4.69 6.89
4.25 6.38
15.03 15.03
4.25 6.38
4.55 5.43
39°C
Outdoor air temperature
DZ/PZ50VK UZ25VK
X (A) Y (A) X (A)
9.69 4.69
9.23 4.25
14.66 15.03
9.23 4.25
9.87 4.40
(B)
38°C
(A)
90
UZ35VK
Y (A) X (A) Y (A)
6.89
6.38
15.03
6.38
5.21
UZ50VK
X (A) Y (A)
9.69
9.23
14.66
9.23
9.87