Checking The Converter Semiconductor Devices - Mitsubishi Electric FR-CC2-H315K Instruction Manual

Area of Inspection
inspection item
General
Conductors and
cables
Transformer/
Main circuit
reactor
Terminal block
Smoothing
aluminum
electrolytic
capacitor
Relay/contactor
Operation
check
Control
circuit,
protection
Overall
circuit
Aluminum
electrolytic
capacitor
Cooling fan
Cooling
system
Heat sink
Indication
Display
Meter/counter
Operation
Load motor
check
*1 Oil component of the heat dissipation grease used inside the converter unit may leak out. The oil component, however, is not flammable,
corrosive, nor conductive and is not harmful to humans. Wipe off such oil component.
*2 It is recommended to install a voltage monitoring device for checking the voltage of the power supplied to the converter unit.
*3 One to two years of periodic inspection cycle is recommended. However, it differs according to the installation environment.
Consult us for periodic inspection.
NOTE
• Continuous use of a leaked, deformed, or degraded smoothing aluminum electrolytic capacitor (as shown in the table above)
may lead to a burst, breakage, or fire. Replace such capacitor without delay.
7.1.4

Checking the converter semiconductor devices

 Preparation
• Disconnect the external power supply cables (R/L1, S/L2, T/L3, P/+, and N/-).
• Prepare a continuity tester. (For the resistance measurement, use the 100 Ω range.)
Description
• Check with megger (between main circuit
terminals and earth (ground) terminal).
• Check for loose screws and bolts.
• Check for overheat traces on the parts.
• Check for stains.
• Check conductors for distortion.
• Check cable sheaths for breakage and
deterioration (crack, discoloration, etc.).
Check for unusual odor and abnormal increase of
whining sound.
Check for a damage.
• Check for liquid leakage.
• Check for safety valve projection and bulge.
• Visual check.
Check that the operation is normal and no
chattering sound is heard.
• Check for an output voltage imbalance between
phases while operating the inverter alone.
• Check that no fault is found in protective and
display circuits in a sequence protective
operation test.
• Check for unusual odor and discoloration.
• Check for serious rust development.
• Check for liquid leakage in a capacitor and
deformation trace.
• Visual check.
• Check for unusual vibration and noise.
• Check for loose screws and bolts.
• Check for stains.
• Check for clogging.
• Check for stains.
• Check that indications are correct.
• Check for stains.
Check that readouts are correct.
Check for vibration and abnormal increase in
operation noise.
Inspection
Corrective action at fault
interval
*3
Daily Periodic
○ Contact the manufacturer.
○ Retighten.
○ Contact the manufacturer.
○ Clean.
○ Contact the manufacturer.
○ Contact the manufacturer.
Stop the equipment and
○
contact the manufacturer.
Stop the equipment and
○
contact the manufacturer.
○ Contact the manufacturer.
○ Contact the manufacturer.
○
○ Contact the manufacturer.
○ Contact the manufacturer.
○ Contact the manufacturer.
Stop the equipment 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 equipment and
○
contact the manufacturer.
Stop the equipment and
○
contact the manufacturer.
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Check
by
occurrence
user
167
7.1 Inspection item
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