GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
184
7. As shown in the figure below, put the black test probe to pad W (RD) and the red test probe to pad NW
(make sure the moisture proof tape is removed). In normal cases, the multimeter should read 0.39±0.3 V.
If it is ―0‖ or infinitely great, the IPM module is faulty.
1.2 Precondition: Units cannot be normally started.
Step 1:
Disconnect the power supply of the units and open the electric junction box of the compressor to see
whether wiring of the compressor is intact.
Step 2:
Measure resistance between two wiring terminals (U, V, W). The resistance value range should be
0.5~2.0 Ω.
Measure the resistance to earth of each wiring terminal. The value should be 10 MΩ. If not, the
compressor has an internal fault.
Step 3:
Check the solenoid valves of the system, include electric expansion valves, oil return valves, and oil
balance valves. Refer to the preceding section for the test method.
Step 4:
Check the IPM module. Refer to the preceding section for the test method.
Measure
resistance
between two
wiring terminals
using a multimeter
Measure the
resistance to earth of
each wiring terminal
one after another
To Next Page
Loading...
