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8. Troubleshooting
Work precautions
• When removing or touching a transformer, printed circuit board or other parts, make sure to turn off the
power supply isolator. Even after disconnecting the power supply isolator, the voltage is still high in the ca-
pacitors on the printed circuit boards. Wait more than 5 minutes, and make sure the voltage is low by using
a tester, before servicing.
• When removing the circuit board, always hold it at both ends and remove carefully so as not to apply force
to the surface mounted parts.
• When removing the circuit board, be careful of the metal edges on the board.
• When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull
on the lead wires.
• When servicing, be sure the failure can be repeated twice or three times before starting repairs.
• When reconnecting the power supply, wait more than 5 minutes after power-off, and then turn it on again.
• If there is a suspected printed circuit board malfunction, check for disconnected wires in the print pattern,
burnt parts or discoloration.
• If the printed circuit board has been replaced, make sure that the switch settings on the new board are the
same as the old board.
(1) Checkpoints for installation condition
No.
1 Do the wiring diameters and capacity of the motor breaker and the earth leakage breaker meet specifi -
cations?
2 Is the specifi ed power (220 to 240 V AC 50 Hz) supplied to the power terminal (TM1)?
3 Do the wirings for the fan speed and bypass condition selections meet specifi cations?
• Contact: 12 V DC 10 mA
• Diameter of cables : 0.5 mm
• Maximum length : 20 m from the terminal block
• Wire peeling length : 9-10 mm
4 Are the wirings for fan speed and bypass condition selections correct?
5 Are the wires for fan speed and bypass condition selections more than 10 cm away from the power sup-
ply cable?
6 Are the connected terminal blocks of the wires for fan speed and bypass condition selections correct?
(TM2 1-4 and TM3 5 are for fan speed selection. TM3 PB and V are for bypass condition selection.)
7 Is each wire securely connected to the terminal blocks?
8 Are external signals correctly input to TM2 and TM3 on the circuit board?
9 Is the output capacity of the operation and malfunction monitors within rated range?
Operation monitor output : Maximum 220 to 240 V AC/ 24 V DC 2 A, minimum 5 V DC 100 mA
Malfunction monitor output : Maximum 220 to 240 V AC/ 24 V DC 2 A, minimum 5 V DC 100 mA
Checkpoints
to 1.0 mm
2
2
─ 16 ─
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