In Case Of Long-Term Storage - Toshiba TOSVERT VF-AS3 Instruction Manual

• Remove the power supply wiring connected to the power terminal block and the wiring to the
motor.
• Wire each power terminal.
Also, remove the wiring of the power circuit output terminals [U/T1], [V/T2], and [W/T3], and perform
an insulation resistance test only on the motor. When you perform an insulation resistance test on
the peripheral circuits in the parts other than the motor, remove all the wiring connected to the
inverter so that a test voltage will not be applied to the inverter.
Important
14. 2. 2
If the smoothing aluminum electrolytic capacitor mounted in the inverter is left unused for a long time
9
without energizing it, the characteristic will deteriorate. When the inverter will not be used for a long
time, periodically check the inspection items stated in [14. 2. 1]. Also, energize the inverter for five
hours or more once every two years to recover the characteristic of the smoothing aluminum electrolytic
capacitor, and check the inverter operation.
When you energize the inverter, it is recommended to gradually increase the voltage with Slidac, etc.
before you connect it to the commercial power supply.
Inspection items for long-term storage
Recover the characteristic of smoothing aluminum
electrolytic capacitor.
14
Check inverter operation.
14. Maintenance and inspection
R/L1 S/L2 T/L3
500 V
megger
• Perform an insulation resistance test only on the power terminal block. Do not perform an insu-
lation resistance test on the control terminals in the parts other than the power circuit, or on the
circuit terminals mounted on the printed circuit board.
• Do not perform a dielectric test. Failure to do so may result in damaged internal parts.

In case of long-term storage

U/T1 V/T2 W/T3
Check method and action
Energize the inverter for five hours or more once
every two years.
*At this time, it is recommended to gradually increase
the voltage with Slidac, etc. before you connect the
inverter to the commercial power supply.
After energizing, check inverter operation.
14-4
E6582062