MCAC-VTSM-2014-04 R410A DC Inverter V4 Plus 50Hz
Troubleshooting 109
DC generatrix check
1) Check the voltage of DC generatrix, the normal value should be 510 to 580V. If the value is less than
510V, go to next step.
2) Check the wiring connection of rectifier circuit, find out any loose in the circuit, and check the filter board,
single-phase rectifier stack, and three-phase rectifier stack. Note DC and AC switch in the
measurement.
3) If none of the above works, replace the PCB.
Module check
1) DC voltage between P and N should be 296V to 324V.
2) DC voltage between 1 and 2 should be 510V to 580V.
3) First adjust multi -meter to diode position, put the red pen on the 1 point (N terminal), put black pen
on the 3 or 4 or 5 point, the value should be approximate 0.378, if the value is 0, the IPM is broken.
And then change the red pen to the 2 point (P terminal), the value should be infinity, if the value is
0, the IPM is broken.
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