Gree GFH09K3FI

99
U-Match Series DC
Inverter Service Manual
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
VKRZQLQWKHIROORZLQJ¿JXUHWRPHDVXUHWKHYROWDJHEHWZHHQ8393DQG:3
Step 2: put the red probe on the place N and the black one on the wiring terminal U, V, W respectively as
VKRZQLQWKHIROORZLQJ¿JXUHWRPHDVXUHWKHYROWDJHEHWZHHQ1819DQG1:
(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 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
DVVKRZQLQWKHIROORZLQJ¿JXUHWRPHDVXUHWKHYROWDJHEHWZHHQ/3DQG/3
Step 2: put the red probe on the place N and the black one on the wiring terminal L1-2, L2-1respectively