MCAC-VTSM-2014-09 R410A All DC Inverter Mini VRF
Troubleshooting 89
DC generatrix check
Check the voltage of DC generatrix, the normal value should be 296 to 324V. If the value is less than 296V,
go to next step.
1) 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.
2) 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.
Direction of the current in DC
supply wire is running through
the inductor should be the same
as the direction of arrow marked
on the inductor
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