Hitachi L100 SERIES Service Manual page 36

Inspection Item
point
Control circuit Operation check Check the balance of the output
Component
check including
PCB
Capacitors on
I/O board
Display Digital operation
panel
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.
Contents
voltage of each phase to phase
without motor.
Perform a sequence protection
operation test and make sure that
there are no errors in the protection
and display circuits.
No abnormal odor nor changes in
color.
No significant corrosion.
No liquid leakage nor deformation.
- No illegible display
- No lack of character
- Segment failure of LEDs
Cycle Method
daily periodic
Measure the
output voltage
between U, V
and W
Simulate
operation of the
protection
circuit
Visual
inspection
Visual
inspection
Visual
inspection
Criteria Standard
replacement
period
Within 2% of voltage
difference between each
phases.
Operate without any
trouble
No abnormalities
No abnormalities
Normal operation.
Display is readable.
Instruments
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page