Mitsubishi Electronics FR-A720-0.4k to 90k Manuale Utente
429
Inspection item
6
6.1.3
Daily and periodic inspection
*1
It is recommended to install a device to monitor voltage for checking the power supply voltage to the inverter.
*2
One to two years of periodic inspection cycle is recommended. However, it differs according to the installation environment.
Consult us for periodic inspection.
Consult us for periodic inspection.
Are
a
o
f
Ins
pec
tion
Inspection Item
Description
Interval
Corrective Action at
Alarm Occurrence
Cu
st
ome
r's
Ch
ec
k
Da
ily
Periodi
c
*2
General
Surrounding
environment
environment
Check the surrounding air temperature, humidity,
dirt, corrosive gas, oil mist , etc.
dirt, corrosive gas, oil mist , etc.
Improve environment
Overall unit
Check for unusual vibration and noise.
Check alarm location and
retighten
retighten
Check for dirt, oil, and other foreign material.
Clean
Power supply
voltage
voltage
Check that the main circuit voltages and control
voltages are normal.
voltages are normal.
*1
Inspect the power supply
Main
circuit
General
(1) Check with megger (across main circuit
terminals and earth (ground) terminal).
Contact the manufacturer
(2) Check for loose screws and bolts.
Retighten
(3) Check for overheat traces on parts.
Contact the manufacturer
(4) Check for stains.
Clean
Conductors, cables
(1) Check conductors for distortion.
(2) Check cable sheaths for breakage and
(2) Check cable sheaths for breakage and
deterioration (crack, discoloration, etc.).
Contact the manufacturer
Contact the manufacturer
Transformer/reactor
Check for unusual odors and abnormal increase
in whining sound.
in whining sound.
Stop the device and contact
the manufacturer.
the manufacturer.
Terminal block
Check for damage.
Stop the device and contact
the manufacturer.
the manufacturer.
Smoothing
aluminum
electrolytic
capacitor
aluminum
electrolytic
capacitor
(1) Check for liquid leakage.
Contact the manufacturer
(2) Check for safety valve projection and bulge.
Contact the manufacturer
(3) Visual check and judge by the life check of the
main circuit capacitor. (Refer to page 430)
Relay/contactor
Check that the operation is normal and no chatter
is heard.
is heard.
Contact the manufacturer
Resistor
(1) Check for crack in resistor insulation.
Contact the manufacturer
(2) Check for a break in the cable.
Contact the manufacturer
Control
circuit
protective
circuit
Operation check
(1) Check that the output voltages across phases
with the inverter operated alone is balanced.
Contact the manufacturer
(2) Check that no fault is found in protective and
display circuits in a sequence protective
operation test.
operation test.
Contact the manufacturer
Pa
rt
s c
hec
k Overall
(1) Check for unusual odors and discoloration.
Stop the device and contact
the manufacturer.
the manufacturer.
(2) Check for serious rust development.
Contact the manufacturer
Aluminum
electrolytic
capacitor
electrolytic
capacitor
(1) Check for liquid leakage in a capacitor and
deformation trace.
Contact the manufacturer
(2) Visual check and judge by the life check of the
control circuit capacitor. (Refer to page 386.)
Cooling
system
Cooling fan
(1) Check for unusual vibration and noise.
Replace the fan
(2) Check for loose screws and bolts.
Fix with the fan cover fixing
screws
screws
(3) Check for stains.
Clean
Heatsink
(1) Check for clogging.
Clean
(2) Check for stains.
Clean
Air filter, etc.
(1) Check for clogging.
Clean or replace
(2) Check for stains.
Clean or replace
Display
Indication
(1) Check that display is normal.
Contact the manufacturer
(2) Check for stains.
Clean
Meter
Check that reading is normal.
Stop the device and contact
the manufacturer.
the manufacturer.
Load
motor
Operation check
Check for vibration and abnormal increase in
operation noise.
operation noise.
Stop the device and contact
the manufacturer.
the manufacturer.