Inspection
point
Item
Contents
Cycle
Method
Criteria
Standard
replacement
Instruments
daily
periodic
period
Control circuit
Operation check Check the balance of the output
voltage of each phase to phase
without motor.
9
Measure the
output voltage
between U, V
and W
Within 2% of voltage
difference between each
phases.
See next
page
Perform a sequence protection
operation test and make sure that
there are no errors in the protection
and display circuits.
9
Simulate
operation of the
protection
circuit
Operate without any
trouble
Component
check including
PCB
No abnormal odor nor changes in
color.
9
Visual
inspection
No abnormalities
No significant corrosion.
9
Capacitors on
I/O board
No liquid leakage nor deformation.
9
Visual
inspection
No abnormalities
Display
Digital operation
panel
- No illegible display
- No lack of character
- Segment failure of LEDs
9
Visual
inspection
Normal operation.
Display is readable.
NOTE : 1. Life time of capacitor is affected by the ambient temperature. See Capacitor Life Curve in the following.
2. The frequency inverter must be cleaned periodically. If dust accumulates on the fan and heat sink, it can cause overheating.
3. See page 30 for the life time of the capacitor.
8-2/E
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