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

Inspection items

9 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 maintenance/inspection and parts life, also refer to
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.
9.1 Inspection items
Area of Inspection
Inspection Item
Surrounding Check the surrounding air temperature,
environment humidity, dirt, corrosive gas, oil mist, etc.
General
Overall unit Check for unusual vibration and noise.
Power supply
Check that the main circuit voltages are normal.
voltage ∗1
(1) Check with megger (across main circuit
(2) Check for loose screws and bolts.
General
(3) Check for overheat traces on the parts.
(4) Check for stain.
(1) Check conductors for distortion.
Conductors,
(2) Check cable sheaths for breakage and
cables
Main circuit
Terminal
Check for damage.
block
(1) Check for liquid leakage.
Smoothing
(2) Check for safety valve projection and bulge.
aluminum
(3) Visual check and judge by the life check of
electrolytic
capacitor
Check that the operation is normal and no
Relay
chatter is heard.
(1) Check that the output voltages across phases
Operation
(2) Check that no fault is found in protective and
check
Control
(1) Check for unusual odor and discoloration.
circuit,
Overall
Protective
(2) Check for serious rust development.
circuit
(1) Check for liquid leakage in a capacitor and
Aluminum
electrolytic (2) Visual check and judge by the life check of
capacitor
(1) Check for unusual vibration and noise.
Cooling fan (2) Check for loose screws and bolts.
Cooling
(3) Check for stain.
system
(1) Check for clogging.
Heatsink
(2) Check for stain.
(1) Check that display is normal.
Indication
(2) Check for stain.
Display
Meter Check that reading is normal.
Operation Check for vibration and abnormal increase in
Load motor
check operation noise.
∗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.
For a periodic inspection, contact your sales representative.
42
Description
terminals and earth (ground) terminal).
deterioration (crack, discoloration, etc.).
the main circuit capacitor (
Chapter 4 of the Instruction Manual (Applied).)
with the inverter operated alone is balanced.
display circuits in a sequence protective
operation test.
deformation trace.
the main circuit capacitor (
Chapter 4 of the Instruction Manual (Applied).)
the Instruction Manual (Applied).
Interval
Periodic
Daily
∗2
Refer to
Refer to
Corrective Action at Alarm
Occurrence
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.
Customer's
Check