
7-20
7.5 Routine and periodic inspection
To ensure safe and problem-free operation, check and maintain the AC Drive at regular intervals.
Use the checklist below as a maintenance guideline.
Disconnect power and wait approximately 10 minutes until to make sure no voltage is present on the output terminals
before performing inspection or maintenance.
Items
Details
Checking
Period
Methods
Criteria
Remedies
Daily 1Year
Environment and Ground Connection
Ambient
conditions
on site
Confirm ambient
temperature and
relative humidity on
site
Measure with
thermometer and
hygrometer
Temp.: -10 to 40°C
(14 to 120°F);
Humidity:
Below 95%RH
Improve the ambient
conditions or relocate
the drive to a better
area.
Are there flammable
materials close to the
AC Drive?
Visual check
Keep area clear
Installation
Grounding
Any unusual vibration
from surrounding
machine?
Visual and noise
check
Keep area clear
Secure screws
Is the grounding
resistance correct?
Measure the
resistance with a
multi-meter
240V class: < 100Ω
480V class: < 10Ω
Improve grounding if
needed.
Terminals and Wiring
Connection
terminals
Check for loose
terminals
Visual check
Check torqu with
screwdriver
Correct installation
requirements
Secure terminals and
remove rust or
corrosion.
Check for damage
to the AC Drive
Check for corroded
Terminals
Wiring
Check for broken
wires
Visual check
Correct wiring
requirements
Rectify as necessary
Check wire insulation
Input Voltage
Input
power
voltage
Check input voltage
Measure the
voltage with a
multi-meter
Voltage must
conform with
specifications
Correct input voltage if
necessary.