Yaskawa E7L Drive Bypass - Manual (Page 204)

Maintenance 7 - 2
E7L Maintenance
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 and Bypass or motor.
• The ambient temperature should be within the Drive and Bypass 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 and Bypass should be operating normally.
Always turn OFF the input power before beginning inspection. Confirm that the digital operator and indicator lights on the
front panel 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 Bypass, then conduct the following inspection.
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.
Bypass Operator
Interface PCB
Bypass
Controller PCB
Control 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.
Contactors
Input Diodes
Output Transistors
or IPMs
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.