Panasonic U-8MF2E8 Service Manual page 20

3. Compressor Control
3-7-4. Primary Current Protection of HIC Board
The fan motor current is included in primary current. PCB is protected from the power consumption increase of
fan motor when the heat exchanger is blocked by frost, etc.
Primary current
1
Limit current 1
Max. current 1 L
Max. current 1 H
* When restarting after stopping by protection control, the compressor capacity will increase slowly.
Reference Inverter layout
Power Source
Limit current 1 (A)
Max. current 1 H (A)
Max. current 1 L (A)
Stop If this current is detected at regular intervals, alarm appears.
Frequency of inverter compressor goes down.
H
Frequency of inverter compressor cannot increase.
L
Frequency of inverter compressor can increase.
Noise Filter Magnet SW
L1
L2
L3
Primary CT
8 hp 10 hp
15.1 19.8
12.1 16.8
11.1 15.8
Diode Bridge Noise Filter
1 - 12
3WAY SYSTEM
Control Functions
12 hp 14 hp 16 hp
21.0 21.0 22.5
18.0 18.0 19.5
17.0 17.0 18.5
hp = horsepower
Secondary CT
IPM(CM)
U
Compressor
V
W
IPM(FN)
U
Fan Motor
V
W