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Chapter 9│Inspection & Maintenance
9.1 Safety
Allow only qualified electrical engineers to install the drive. Failure to comply could cause electrical
shocks to personnel or damage to the drive.
Ensure the power supply is off when connecting. Failure to comply could cause electrical shocks.
Shut off the power supply of all the equipment before inspection. Maintain the drive only when the
CHARGE indicator light is off or 5 minutes after turning off power supply, so as to avoid charged
capacitors causing physical injury.
Do not perform wiring, remove option card or replace cooling fan during drive operation to
prevent an electrial shock.
Shut off the drive power supply and ensure no voltage is left before maintenance.
Do not operate the drive with the drive enclosure removed. Failure to comply could cause electrical
shocks.
Properly wire the ground terminal of the motor side. Failure to comply could cause electrical
shocks when touching the motor enclosure.
Do not touch any live components to avoid electrical shocks.
Do not tough the terminals. Avoid output cables contacting the drive enclosure.
Do not inspect or maintain the drive when waring loose clothing, jewelry or without eye protection.
Failure to comply could cause electrical shocks or inquiry.
AC drives consist of electronics such as IC, resistors, capacitors, transistors fans and relays. As
electronics components have limited life, characteristic changes or malfunction will occur after
years of use under normal conditions. Regular inspections, components replacement are
therefore necessary. Perform the regular inspection according to the check list in this chapter.
More frequent inspection is needed in the following situations.
· Poor storage conditions.
· High ambient temperature
· Frequent starts and stops
· Excessive vibration or shock load
· Fluctuations in the AC power supply or load
· Dust, metal shavings, salt, sulfuric acid and chlorine atmospheres
Perform the first inspection one to two years after installation.
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