Checking The Inverter For Damage At No-Load - Mitsubishi Electric PUHY-HP200YNW-A Service Handbook

[8-9 Troubleshooting Inverter Problems ]
8-9-4

Checking the Inverter for Damage at No-Load

Items to be checked
(1) Stop the unit.
Remove power supply.
(2) Disconnect the inverter
output wires from the
compressor terminals (U,
*1
V, W).
(3) Set SW7-1 on the MAIN
board to ON.
(4) Apply power supply.
(5) Put the outdoor unit into
operation.
Check the inverter output
voltage after the inverter
output frequency has sta-
bilized.
*1 Output voltage is present at the inverter output wiring terminal. To avoid short-circuiting and ground fault, do not let the
terminal come in contact with the unit or the compressor, and use caution not to damage the terminal.
34
- chapter 8
Phenomena
1) Inverter-related problems are detected.
2) Inverter voltage is not output at the termi-
nals (U, V, and W)
3) There is an voltage imbalance between
the wires.
Greater than 5% imbalance or 5V
4) There is no voltage imbalance between
the wires.
Remedy
Set SW7-1 on the MAIN board to ON,
and go to [8-9-2 Checking the Inverter
Board Error Detection Circuit].
Replace the INV board.
Replace the INV board.
Normal
*When done checking, set SW7-1 on
the MAIN board back to as it was.
BS_08_M