GREE DC INVERTER HEAT PUMP CONDENSING UNIT
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3.2.2 IPM, PFC Testing Method
3.2.2.1Method 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.
3.2.2.2 Method of Testing PFC Module Short Circuit
(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, L2-1 respectively as
shown in the following figure to measure the voltage between L1-2 and P; L2-1 and P.
Step 2: Put the red probe on the place N and the black one on the wiring terminal L1-2, L2-1 respectively as
shown in the following figure to measure the voltage between N and L1-2; N and L2-1.
(3) If the measured voltages between L1-2 and P; L2-1 and P; N and L1-2; N and L2-1 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.
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