Periodic Inspection; Periodic Inspections With No Power Applied; Periodic Inspections With Power Applied - YASKAWA P7 User Manual

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.
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
WARNING
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.
Item
External terminals,
mounting bolts,
connectors, etc.
Cooling fins
Control PCB
Terminal PCB
Power PCB
Gate Drive PCBs
Input Diodes
IPMs
Output Transistors
DC bus capacitors
Apply power to the Drive and conduct the following inspection.
Item
Cooling fan(s)
Table 7.1 Periodic Inspections With no Power Applied
Inspection
Are all screws and bolts tight?
Are connectors tight?
Are the fins dirty or dusty?
Is there any conductive dirt or oil mist on the
PCBs?
Is there any conductive dirt or oil mist on the
modules or components?
Are there any irregularities, such as
discoloration or odor?
Table 7.2 Periodic Inspections With Power Applied
Inspection
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.
Maintenance 7 - 2
Corrective Action
Tighten loose screws and bolts firmly.
Reconnect the loose connectors.
Clean off any dirt and dust with an air gun using
clean and dry air at a pressure between 55-85 psi.
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.
Clean off any dirt and dust with an air gun using
clean and dry air at a pressure between 55-85 psi.
Replace the capacitors or Drive.
Corrective Action
Replace Cooling Fan