Mitsubishi Electric PUHY-P200 Service Handbook page 146

[5] 1. Check to see if the IPM screw
Check the terminal is loose.
inverter circuit
trouble. 2. Check the exterior of the IPM.
3. Check the resistances between
each terminal of IPM.
Refer to 9.[4].6.(5) for details
on IPM troubleshooting.
[6] Remove the wire for the outdoor
fan motor and check the fan
Check the fan
motor megger and the winding
motor grounding
resistance.
fault and the
winding.
1. Check around the fan output
[7]
wiring.
Check the FAN
board failure.
2. Check the connector CNVDC
connection
3. Check the FAN board failure.
4. Check the transformation of
the FAN board.
Check item
(1) Screw terminal is loose.
(2) IPM is cracked due to swelling.
(3) Resistance error between each ter-
minal of IPM.
(4) All normal for items (1) ~ (3) above.
(1) Fan motor megger fault
Fault when the megger is 1
less.
(2) Fan motor disconnection
Standard: The winding resistance
is approximately several Ω.
(It varies depending on the tempe-
rature or while the inner thermo is
operating, it will be ∞Ω.)
Connector contact failure
1) Board side (CNINV)
2) Fan motor side
Connector contact failure
(1) The voltage unbalance among
each motor.
(The voltage unbalance is
grerater than the larger of the
values represented by 5% or 5V.)
(2) The same error occurs even if
operated again.
The same error occurs even if the
board is replaced as described in 3.
Phenomena
Ω
or
- 144 -
Treatment
Check all IPM screw terminals and
tighten.
• IPM replacement
Check the operation in [3] or [4] after
replacing the IPM.
In the case of an output voltage un-
balance or error recurrence:
→Replace the G/A board
In the case of an output voltage un-
balance or error recurrence after re-
placement:
→Replace the INV board
• IPM replacement
Check the operation in [3] or [4] after
replacing the IPM.
In the case of an output voltage un-
balance or error recurrence:
→Replace the G/A board
In the case of an output voltage un-
balance or error recurrence after re-
placement:
→Replace the INV board
• IPM replacement
In the case of an output voltage un-
balance or error recurrence after re-
placement:
→Replace the G/A board
In the case of an output voltage un-
balance or error recurrence after re-
placement:
→Replace the INV board
Replace the fan motor.
Connect the connector
Connect the connector
Replace the FAN board.
Replace the power-supply
transformation for FAN board.