Precautions For Maintenance And Inspection - Mitsubishi Electric FR-E700 Instruction Manual

7 PRECAUTIONS FOR MAINTENANCE AND INSPECTION

The inverter is a static unit mainly consisting of semiconductor devices. Daily inspection must be performed to prevent any
fault from occurring due to the adverse effects of the operating environment, such as temperature, humidity, dust, dirt and
vibration, changes in the parts with time, service life, and other factors.
REMARKS
For the details of fault displays and other malfunctions, also
Precautions for maintenance and inspection
For some short time after the power is switched OFF, a high voltage remains in the smoothing capacitor. When accessing the
inverter for inspection, wait for at least 10 minutes after the power supply has been switched OFF, and then make sure that
the voltage across the main circuit terminals P/+ and N/- of the inverter is not more than 30VDC using a tester, etc.
If "EV" is displayed on the operation panel, turn off the 24V external power supply before inspection.
7.1 Inspection items
Area of Inspection
Inspection Item
Surrounding
environment
Overall unit
General
Power supply
voltage
General
Conductors,
cables
Main circuit
Terminal block
Smoothing
aluminum
electrolytic
capacitor
Relay
Operation
check
Control
circuit,
Overall
Protective
circuit
Aluminum
electrolytic
capacitor
Cooling fan
Cooling
system
Heatsink
Indication
Display
Meter
Operation
Load motor
check
∗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.
Description
Check the surrounding air temperature, humidity,
dirt, corrosive gas, oil mist, etc.
Check for unusual vibration and noise.
Check that the main circuit voltages are
normal.∗1
(1) Check with megger (across main circuit
terminals and earth (ground) terminal).
(2) Check for loose screws and bolts.
(3) Check for overheat traces on the parts.
(4) Check for stain.
(1) Check conductors for distortion.
(2) Check cable sheaths for breakage and
deterioration (crack, discoloration, etc.).
Check for damage.
(1) Check for liquid leakage.
(2) Check for safety valve projection and bulge.
(3) Visual check and judge by the life check of the
main circuit capacitor ( Refer to Chapter 7 of
the Instruction Manual (Applied))
Check that the operation is normal and no
chatter is heard.
(1) Check that the output voltages across phases
with the inverter operated alone is balanced.
(2) Check that no fault is found in protective and
display circuits in a sequence protective
operation test.
(1) Check for unusual odor and discoloration.
(2) Check for serious rust development.
(1) Check for liquid leakage in a capacitor and
deformation trance.
(2) Visual check and judge by the life check of the
main circuit capacitor ( Refer to Chapter 7 of
the Instruction Manual (Applied))
(1) Check for unusual vibration and noise.
(2) Check for loose screws and bolts.
(3) Check for stain.
(1) Check for clogging.
(2) Check for stain.
(1) Check that display is normal.
(2) Check for stain.
Check that reading is normal.
Check for vibration and abnormal increase in
operation noise.
refer to the Instruction Manual (Applied).
Interval
Corrective Action at Alarm
Periodic
Daily
Occurrence
∗2
Improve environment
Check alarm location and retighten
Inspect the power supply
Contact the manufacturer
Retighten
Contact the manufacturer
Clean
Contact the manufacturer
Contact the manufacturer
Stop the device and contact the
manufacturer.
Contact the manufacturer
Contact the manufacturer
Contact the manufacturer
Contact the manufacturer
Contact the manufacturer
Stop the device and contact the
manufacturer.
Contact the manufacturer
Contact the manufacturer
Replace the fan
Fix with the fan cover fixing screws
Clean
Clean
Clean
Contact the manufacturer
Clean
Stop the device and contact the
manufacturer.
Stop the device and contact the
manufacturer.
Inspection items
Customer's
Check
29