Handling - YASKAWA Varispeed G7 Series Instruction Manual

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Handling

Observe the following precautions when wiring or performing maintenance for an Inverter.
Wiring Check
The Inverter will be internally damaged if the power supply voltage is applied to output terminal U, V, or W.
Check wring for any mistakes before supplying power. Check all wiring and sequences carefully.
Magnetic Contactor Installation
Do not start and stop operation frequently with a magnetic contactor installed on the power supply line. Doing
so can cause the Inverter to malfunction. Do not turn the Inverter ON and OFF with a magnetic contactor more
than one time every 30 minutes.
Setting the Power Supply Voltage Jumper (400 V Class Inverters of 55 kW or Higher)
If the jumper is inserted into a power tap that does not match the actual power supply voltage, the lifetime of
the transformer for the power supply or the wind capacity of the cooling fan may be reduced.
If the jumper is inserted and the voltage setting is too low for the actual power supply, a power surge may
occur on the transformer for the power supply and reduce the lifetime of the transformer.
If the jumper is inserted and the voltage setting is too high for the actual power supply, the wind capacity of
the cooling fan is reduced.
Insert the jumper into the power tap with the voltage setting nearest to the voltage of the actual power supply.
Refer to Chapter 4 Trial Operation for the procedure.
Maintenance and Inspections
After turn OFF the main circuit power supply, always confirm that the CHARGE indicator is not lit before
performing maintenance or inspections. The voltage remaining in the capacitor may cause electric shock.
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