Checkpoints For Periodical Inspection; Notes For Periodical Inspection - Toshiba TOSVERT VF-AS3 Instruction Manual

14. 2 Periodical inspection
Perform periodical inspection once every three to six months depending on the operating conditions.
• Before inspection, perform the following steps.
(1) Turn off the power to the inverter.
(2) Wait at least 15 minutes and verify that the charge lamp is no longer lit.
(3) Use a tester that can measure DC voltages (800 VDC or more), and verify that the voltage
to the DC main circuits between [PA/+] and [PC/-] is 45V or less.
Performing inspection without carrying out these steps can lead to electric shock.
Mandatory
When using the PM motor, please verify that the PM motor is stopped. While the PM motor is
action
rotating even after the power is turned off, as a high voltage is generated in the output terminals
[U/T1], [V/T2] and [W/T3] on the PM motor side, touching the output terminals will result in elec-
tric shock.
14. 2. 1

Checkpoints for periodical inspection

The periodical inspection items and check methods are shown in the following table.
Periodical inspection item
Check the screw parts of the wiring terminals for
looseness.
Check the caulked parts of the wiring terminals for any
poor caulking.
Check the wiring for any damage.
Clean dirt or dust.
Perform an insulation resistance test on the power ter-
minal block.
Check the input voltage and output voltage.
Check the ambient temperature.

■ Notes for periodical inspection

When you use a vacuum cleaner for cleaning, pay attention to the vents, printed circuit boards, etc.
Keep in mind that adhesion of dirt or dust may result in an unexpected accident. Be sure to keep
them dust free.
Perform an insulation resistance test of the power terminal block only on the inverter as shown in the
following figure.
WARNING
Check method and action
Tighten the screw parts of the wiring terminals with a
screwdriver.
Visually check the caulked parts for any trace of over-
heat.
Visual check
Clean it with a vacuum cleaner.
Test only the power terminal block at 500 V mega to
check that the insulation resistance is a few MΩ or
more (the value is lower for the built-in noise filter
models).
Periodically check the input-side voltage with a mov-
ing-iron type AC voltmeter (recommended).
Periodically check the output-side voltage with a recti-
fier type AC voltmeter (recommended).
Measure the ambient temperature of the inverter
every time at startup, during run, and at stop.
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14. Maintenance and inspection
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