Omron VARISPEED E7 User Manual page 298

Item
External terminals
Are all screws and bolts tight?
Mounting bolts
Are connectors tight?
Connectors
Cooling fins Are the fins dirty or dusty?
Cooling Fan Are the cooling fans dirty or dusty
Is there any conductive dirt or oil mist on
All PCBs
the PCBs?
Input Diodes
Is there any conductive dirt or oil mist on
Output Transistors
the modules or components?
Power Modules
Are there any irregularities, such as dis-
DC bus capacitors
coloration or odor?
Cable Glands Are the cable glands tightened properly?
Apply power to the Inverter and conduct the following inspection:
Item
Is there any abnormal noise or vibration,
or has the total operating time exceeded
Cooling Fan(s) 20,000 hours.
Check U1-40 for the elapsed cooling oper-
ation time.
Table 8.2 Inspection Items for IP54 Inverters
Inspection
Inspection
Maintenance and Inspection
Corrective Procedure
Tighten loose screws and bolts firmly.
Reconnect the loose connectors.
Clean off any dirt and dust with an air gun using
5
dry air at a pressure of 4 x 10 to 6 x 10
(4 to 6 bar, 55 to 85 psi).
7.5 to 18.5 kW:
External cooling fan is attached on the lower
side in the wind tunnel.
Check the fan from the bottom and clean off
any dirt in the same way as cleaning the
cooling fin.
22 to 55 kW:
External cooling fan is attached on the upper
side in the wind tunnel.
Check the fan from the top and clean off any
dirt in the same way as cleaning the cooling
fin.
Clean off any dirt and dust with an air gun using
5
dry air at a pressure of 4 x 10 to 6 x 10
(4 to 6 bar, 55 to 85 psi).
Replace the boards if they cannot be made clean.
Clean off any dirt and dust with an air gun using
5
dry air at a pressure of 4 x 10 to 6 x 10
(4 to 6 bar, 55 to 85 psi).
Replace the capacitor or Inverter.
Tighten the cable glands and locknuts.
Corrective Procedure
Replace Cooling Fan
5
Pa
5
Pa
5
Pa
8-3