Service Manual

U-Match Series DC Inverter Service Manual
117
2.4 IPM, PFC Testing Method
2.4.1 Method of Testing IPM Module
(1) Preparation before test: prepare a universal meter and turn to its diode option, and then remove
the wires U, V, W of the compressor after it is powered off for one minute.
(2) Testing Steps
Step 1: put the black probe on the place P and the red one on the wiring terminal U, V, W respectively
as shown in the following figure to measure the voltage between UP, VP and WP.
Step 2: put the red probe on the place N and the black one on the wiring terminal U, V, W respectively
as shown in the following figure to measure the voltage between NU, NV and NW.
(3) If the measured voltages between UP, VP, WP, NU, NV, NV are all among 0.3V-0.7V, then it
indicates the IPM module is normal; If any measured valve is 0, it indicates the IPM is damaged.
2.4.2
Method of Testing PFC Module Short Circuit (only for GUHD48ND3FO):
(1) Preparation before test: prepare a universal meter and turn to its diode option, and then remove
the wires L1-2, L2-1 after it is powered off for one minute.
(2) Testing Steps
Step 1: put the black probe on the place P and the red one on the wiring terminal L1-2,
L2-1respectively as shown in the following figure to measure the voltage between L1-2P and.L2-1 P.
Step 2: put the red probe on the place N and the black one on the wiring terminal L1-2,
L2-1respectively as shown in the following figure to measure the voltage between N L1-2 and NL2-1.
(3) If the measured voltages between L1-2P ,L2-1 P, N L1-2 , NL2-1 are all among 0.3V-0.7V, then it
indicates the PFC module is normal; If any measured valve is 0, it indicates the PFC is damaged.
 GUHD18ND3FO/GUHD24ND3FO/ GUHD30ND3FO /GUHD36ND3FO/ GUHD42ND3FO