Chapter 6 Maintenance And Inspection; Daily Inspection; Periodic Inspection - Fuji Electric frenic-hvac Instruction Manual

Chapter 6 MAINTENANCE AND INSPECTION
Perform daily and periodic inspections to avoid trouble and keep reliable operation of the inverter for a long time.

6.1 Daily Inspection

Visually inspect the inverter for operation errors from the outside without removing the covers when the inverter is
ON or operating.
- Check that the expected performance (satisfying the standard specification) is obtained.
- Check that the surrounding environment (temperature, surrounding space, etc.) satisfies the requirements.
- Check that the keypad displays normally.
- Check for abnormal noise, odor, or excessive vibration.
- Check for traces of overheat, discoloration and other defects.

6.2 Periodic Inspection

Before starting periodic inspections, be sure to stop the motor, shut down the power, and wait at least 10 minutes.
Further, make sure, using a multimeter or a similar instrument, that the DC link bus voltage between the main
circuit terminals P(+) and N(-) has dropped to the safe level (+25 VDC or below).
Check part Check item
Environment 1) Check the surrounding
temperature, humidity, vibration and
atmosphere (dust, gas, oil mist, or
water drops).
2) Check that tools or other foreign
materials or dangerous objects are
not left around the equipment.
Input voltage Check that the input voltages of the
main and control circuit are correct.
1) Check that the display is clear.
Keypad
2) Check that there is no missing part
in the displayed characters.
Check for:
Structure such
as frame and
1) Abnormal noise or excessive
cover
vibration
2) Loose bolts (at clamp sections).
3) Deformation and breakage
4) Discoloration caused by overheat
5) Contamination and accumulation of
dust or dirt
1) Check that bolts and screws are
Common
tight and not missing.
2) Check the devices and insulators
for deformation, cracks, breakage
and discoloration caused by
overheat or deterioration.
3) Check for contamination or
accumulation of dust or dirt.
1) Check conductors for discoloration
Conductors
and distortion caused by overheat.
and wires
2) Check the sheath of the wires for
cracks and discoloration.
Table 6.1 List of Periodic Inspections
How to inspect
1) Check visually or
measure using
apparatus.
2) Visual inspection
Measure the input
voltages using a
multimeter or the like.
1), 2)
Visual inspection
1) Visual or auditory
inspection
2) Retighten.
3), 4), 5)
Visual inspection
1) Retighten.
2), 3)
Visual inspection
1), 2)
Visual inspection
6-1
Evaluation criteria
1) The standard
specifications must be
satisfied.
2) No foreign or dangerous
objects are left.
The standard specifications
must be satisfied.
1), 2)
The display can be read
and there is no fault.
1), 2), 3), 4), 5)
No abnormalities
1), 2), 3)
No abnormalities
1), 2)
No abnormalities