Gree U-match Series

U-Match Series DC Inverter Service Manual
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(2) Filtering Board:
3
4
5
67
1
2
No.
Printing
Interface
No.
Printing
Interface
1
N-OUT
Neutral wire output (white)
2
L-OUT
Live wire output (red)
3
DC-BUS
DC bus interface (connect to drive board)
4
AC-L
Live wire input (red)
5
N
Neutral wire input (white)
6
E1
(Reserved)
7
E
Grounding wire (screw hole)
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
Note: only for GUHD42NS3GO/GUHD48NS3GO/GUHD60NS3GO）
(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,