Gree GKH42K3FI

U-Match Series DC Inverter Service Manual
115
(2) Filtering Board:
No.
Terminal name
Interface instruction
No.
Terminal name
Interface instruction
1
X1
Complete unit power input wire AC-L1
6
X6
Power output wire L2-F
(connect to drive board L2-F)
2
X2
Complete unit power input wire AC-L2
7
X7
Power output wire L3-F
(connect to drive board L3-F)
3
X3
Complete unit power input wire AC-L3
8
X8
Power output neutral wire N-F
(connect to drive board AC-N)
4
X4
Complete unit power input neutral wire AC-N
9
X9
Grounding wire E, reserved
5
X5
Power output wire L1-F (connect to drive board
L1-F and main control board AC-L)
10
X10
Grounding wire E
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.