Omron VARISPEED L7 User Manual

8-2
8
Maintenance and Inspection
 Periodic Inspection
Check the following items during periodic maintenance.
• The motor should not vibrate or make unusual noises.
• There should be no abnormal heat generation from the Inverter or motor.
• The ambient temperature should be within the Inverter’s specifications.
• The output current value shown in U1-03 should not be higher than the motor or the Inverter rated current
for extended period of time.
• The cooling fan in the Inverter should be operating normally.
Before attempting any maintenance checks, make sure that the three-phase power is disconnected. With power
removed from the unit, the DC bus capacitors will stay charged for several minutes. The charge LED in the
Inverter will light red until the DC bus voltage is below 10VDC. To ensure that the DC bus is completely dis-
charged, measure between the positive and negative bus with a DC voltmeter. Be sure not to touch terminals
immediately after the power has been turned off. Doing so can result in electric shock.
Table 8.1 Periodic Inspections
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).
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 discoloration
or odor?
Replace the capacitor or Inverter.
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 operation
time.
Replace Cooling Fan

Omron VARISPEED L7 Specifications

General

Brand	Omron
Model	VARISPEED L7
Category	Inverter
Language	English