Toshiba TOSVERT VF-AS3, Instruction Manual

Page: 609 / 622

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14. Maintenance and inspection
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To prevent a failure due to the influence of the operating environment such as temperature, humid-
ity, dust, or vibration, or to aging or lives of the used parts, perform daily inspection and periodical
inspection.
The electronic parts are vulnerable to heat. Therefore, be sure to install the inverter in a well-ventilated,
dust-free environment with low ambient temperature.
The purpose of the daily inspection is to maintain the environment and to find any sign of abnormal opera-
tion before a failure occurs by recording and comparing the operation data.
14. 1. 1 Checkpoints for daily inspection
Perform daily inspection according to the following items and table:
• Are any abnormalities found in the installation environment?
• Does the cooling system have any problems?
• Is unusual vibration or sound found?
• Is abnormal overheat or discoloration found?
• Is an unusual smell found?
• Is adhesion or accumulation of foreign substances (conductive substances) found?
• Is unusual vibration, sound, or overheat found in the motor?
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Maintenance and inspection
WARNING
Mandatory
action
• Perform daily inspection and periodic inspection on equipment.
If you use the inappropriate inverter, not only will the three-phase motor not rotate correctly, but
it will cause serious accidents such as overheating and burning out.
• 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, and verify that the residual
voltage of AC main circuits cable is 45V or less.
Performing inspection without carrying out these steps can lead to electric shock.
When using the PM motor, please verify that the PM motor is stopped. While the PM motor is
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
electric shock.
14. 1 Daily inspection and cleaning