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