Panasonic U-8MF2E8 Service Manual page 19

3. Compressor Control
3-7. Protection Control
3-7-1. Compressor discharge temperature protection
The compressor capacity is controlled according to the table below.
*Discharge temperature that is used for this control is the highest temperature among all compressors.
Discharge temp.
106 deg
105 deg
104 deg
103 deg
101 deg
3-7-2. Abnormal Low Pressure Protection
The compressor capacity is controlled according to the table below.
Low pressure
0.25 MPa
0.20 MPa
0.17 MPa
3-7-3. Over-current Protection of Compressor
Current limitation of compressor is shown in the table below. This limitation is to protect the compressor, so that
the current of the power cable connected with the compressor is limited.
* For the inverter compressor, this is the secondary current from HIC board.
Inverter compressor
Secondary current
Constant speed compressor
Limit current (A)
Limit current 2
Max. current 2 H
Max. current 2 L
Stop If this temperature is detected at regular intervals, alarm appears.
Capacity goes down 2.0 hp
Compressor
capacity
Capacity goes down 1.0 hp
decreases
Capacity goes down 0.5 hp
Compressor capacity cannot increase
Compressor capacity can increase
No restriction
Capacity goes up slowly
Capacity cannot increase
Capacity goes down
Limit current 2 (A)
Max. current 2 H (A)
Max. current 2 L (A)
8 hp 10 hp
- -
Stop If this current is detected at regular intervals, alarm appears.
Frequency of inverter compressor goes down.
Frequency of inverter compressor cannot increase.
Frequency of inverter compressor can increase.
8 hp 10 hp
20.6 21.8
18.1 19.3
17.1 18.3
12 hp 14 hp 16 hp
12.4 12.4 14.9
hp = horsepower
1 - 11
3WAY SYSTEM
Control Functions
hp = horsepower
12 hp 14 hp 16 hp
21.0 22.5 22.5
18.5 20.0 20.0
17.5 19.0 19.0
hp = horsepower
1