Compressor Current Detection Circuit - Technibel GRV250R5TAA Technical Data & Service Manual

2-15 Compressor Current Detection Circuit

The Compressor Current Detection Circuit detects the compressor current and,
depending on the current range, can stop the compressor motor so it will not be
damaged by overcurrent.
Overcurrent can be caused by several factors, particularly mechanical seizing of
the compressor or liquid backflow. Either of these conditions can hold the
compressor to run, and thus drawing so much current that the motor can burn
out.
Outdoor Model
GRV250(R/L)5TAA
1 GRV250(R/L)7TAA
GRV360(R/L)7TAA
GRV480(R/L)7TAA
1 2
Overload Protection
• When the detected current is 1.17 – 1.4 times greater than the rated current value (Is) and continues
for 30 seconds, both compressor and outdoor fan stop (Thermostat OFF).
• After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, if the
condition mentioned above repeats twice within 30 minutes, the remote controller displays the alarm
3
message H01, compressor overload.
Locked Compressor Cut-off
• When the detected current is 1.4 times greater than the rated current value (ls) and continues for 2
seconds, both compressor and outdoor fan stop (Thermostat OFF).
• After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, if the
condition mentioned above repeats twice, the remote controller displays the alarm message H02,
compressor locked.
4
Failure of Compressor Current Detection
• When the Compressor Current Detection Circuit fails to detect the compressor current within 2
seconds after compressor starts, both compressor and outdoor fan stop (Thermostat OFF).
• After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, when
the circuit fails to detect the current twice in a row, the remote controller displays alarm message H03,
Failure of compressor Current Detection.
5
Comp. Amps.(A)
Is 1.4
Is 1.17
Is
Rated Current
value
Rated Current Value
ls (A)
23.1
7.1
10.3
13.6
Chart Summary and Explanations
2. Processes and functions
Locked Comp. Cut-off Range
Overload Protection Range
Normal Operation Range
Overload Protection
ls x 1.17 (A)
27.0
8.31
12.05
15.9
II - 16
0447_M_S
Fig. 18
Locked Compressor Cut-off
Is x 1.4 (A)
32.3
9.94
14.42
19.0