U-Match Series DC Inverter Service Manual
116
2.4.2 Method of Testing PFC Module Short Circuit:（only for
GUHD48NK3FO）
(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.
GUHD09NK3FO/GUHD12NK3FO
GUHD18NK3FO/GUHD24NK3FO/GUHD30NK3FO/GUHD36NK3FO/GUHD42NK3FO/GUHD3
6NM3FO/ GUHD42NM3FO
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