Yaskawa E7 Drive User Manual - Manual (Page 164)

Maintenance 7 - 2
Periodic Inspection
Check the following items during periodic maintenance.
• The motor should not be vibrating or making unusual noises.
• There should be no abnormal heat generation from the Drive or motor.
• The ambient temperature should be within the Drive specification of -10 °C to 40°C (14°F to 104°F).
• The output current value shown in parameter U1-03 should not be higher than the motor rated current for an extended period
of time.
• The cooling fan in the Drive should be operating normally.
Always turn OFF the input power before beginning inspection. Confirm that the digital operator indicators on the front cover
have all turned OFF, and then wait an additional five minutes before beginning the inspection. Be sure not to touch terminals
immediately after the power has been turned off. Doing so can result in electric shock. Please refer to Warnings on page i.
Apply power to the Drive and conduct the following inspection.
WARNING
Prior to removing any protective cover or wiring any part of the Drive, remove all power sources, including
main input power and control circuit power. Wait a minimum of 5 minutes after power removal, before
removing any cover. The charge lamp located within the Drive should be off prior to working inside. Even if
the charge lamp is off, one must measure the AC input, output, and DC Bus potential to insure safe levels
prior to resuming work. Failure to adhere to this warning may result in personal injury or death.
Table 7.1 Periodic Inspections With no Power Applied
Item Inspection Corrective Action
External terminals,
mounting bolts,
connectors, etc.
Are all screws and bolts tight? Tighten loose screws and bolts firmly.
Are connectors tight? Reconnect the loose connectors.
Cooling fins Are the fins dirty or dusty?
Clean off any dirt and dust with an air gun using
clean and dry air at a pressure between 55-85 psi.
Control PCB
Terminal PCB
Power PCB
Gate Drive PCBs
Is there any conductive dirt or oil mist on the
PCBs?
Clean off any dirt and dust with an air gun using
clean and dry air at a pressure between 55-85 psi.
Replace the boards if they cannot be made clean.
Input Diodes
IPMs
Output Transistors
Is there any conductive dirt or oil mist on the
modules or components?
Clean off any dirt and dust with an air gun using
clean and dry air at a pressure between 55-85 psi.
DC bus capacitors
Are there any irregularities, such as
discoloration or odor?
Replace the capacitors or Drive.
Table 7.2 Periodic Inspections With Power Applied
Item Inspection Corrective Action
Cooling fan(s)
Is there any abnormal noise or vibration, or has
the total operating time exceeded 20,000 hours?
Check U1-40 for elapsed cooling fan operation
time.
Replace Cooling Fan
TM_E7_01_07182008.book Page 2 Wednesday, July 23, 2008 2:35 PM