Mitsubishi Electric PUHZ-ZRP100VKA3 Service Manual page 40

Check Code Abnormal points and detection method
PFC error (Overvoltage/
Detailed
Undervoltage/Overcurrent)
codes
• PFC detected any of the fol-
lowing:
a) Increase of DC bus voltage
to 420 V.
b) Decrease in PFC control
10
voltage to 12 V DC or lower.
c) Increase in input current
U9
to 50 A peak. (For models
(4220)
equipped with single-phase
PFC only)
PFC/IGBT error
(Undervoltage)
• When Compressor is running,
20 DC bus voltage stays at 310V
or lower for consecutive 10
seconds
(ZRP100–140V)
Over heat protection
Abnormal if outdoor pipe thermistor (TH3)
detects 70: or more during compressor
operation.
Ud
(UD)*
(1504)
Compressor overcurrent interruption
(When compressor locked)
Abnormal if overcurrent of DC bus or
compressor is detected within 30 seconds
after compressor starts operating.
UF
(4100)
Current sensor error or input current error
• Abnormal if current sensor detects −1.0A
to 1.0A during compressor operation. (This
error is ignored in case of test run mode.)
UH
• Abnormal of 38 A of input current is
(5300)
detected, or 34 A or more of input current
is detected for 10 seconds continuously
(ZRP100–140V only)
OCH645
Case
Not applicable for ZRP100–250 model. Check the switch setting for Model Select
1 Incorrect switch settings on the
outdoor controller circuit board for
model select
2 Defective outdoor power circuit board
3 Defective outdoor controller circuit
board
1 Defective outdoor fan (fan motor)
or short cycle of outdoor unit during
cooling operation
2 Defective outdoor pipe thermistor
(TH3)
3 Defective outdoor controller board
1 Stop valve is closed.
2 Decrease of power supply voltage
3 Looseness, disconnection or con-
verse of compressor wiring connec-
tion
4 Defective compressor
5 Defective outdoor power board
6 DIP switch setting difference of out-
door controller circuit board.
1 Disconnection of compressor wiring
2 Defective circuit of current sensor on
outdoor power circuit board
3 Decrease of power supply voltage
40
Judgment and action
on the outdoor controller circuit board.
1 Correction of a model select
2 Replace outdoor power circuit board.
3 Replace outdoor controller circuit board
1 Check outdoor unit air passage.
23 Turn the power off and on again to
check the check code. If U4 is dis-
played, follow the U4 processing direc-
tion.
*The check code in the parenthesis indi-
cates PAR-30/31MAA model.
1 Open stop valve.
2 Check facility of power supply.
3 Correct the wiring (U V W phase) to
• •
compressor. Refer to "10-9. TEST
POINT DIAGRAM" (Outdoor power
circuit board).
4 Check compressor.
Refer to "10-6. HOW TO CHECK THE
PARTS".
5 Replace outdoor power circuit board.
6 Check the DIP switch setting of outdoor
controller circuit board. Refer to "Model
Select" in "1) Function of switches" in
"10-10. FUNCTION OF SWITCHES,
CONNECTORS AND JUMPERS".
1 Correct the wiring (U V W phase) to
• •
compressor. Refer to "10-9. TEST
POINT DIAGRAM" (Outdoor power
circuit board).
2 Replace outdoor power circuit board.
3 Check the facility of power supply.