8 Troubleshooting
316
SMGB0064 rev.0 - 08/2011
• DIP-IPM
a. Turn OFF the main switches and wait for three minutes. Check
to ensure that no high voltage exists. If LED201 is ON after start-
up and LED201 is OFF after turning OFF power source, the volt-
age will decrease lower than DC50V.
b. Connect connecting wires to an electrical solder bit.
c. Connect the wires to terminals, P and N on IPM. => Discharging
is started, resulting in hot solder bit. Pay attention not to short-
circuit between terminal P and N.
d. Wait for 2 or 3 minutes and measure the voltage once again.
Check to ensure that no voltage is charged.
1. Solder bit.
2. Plug.
3. Connecting wires.
4. Transistor module (IPM).
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1. Drive circuit.
2. Overheating protection circuit.
3. Sensor.
1. Checking Method of Transistor Module Outer Appearance and
Internal Circuit of Transistor Module
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