Checking The Inverter And Converter Modules - Mitsubishi Electric 800 Series Instruction Manual

Area of Inspection
inspection item
Indication
Display
Meter/counter
Operation
Load motor
check
*1 Oil component of the heat dissipation grease used inside the inverter 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 inverter.
*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.
3.1.4

Checking the inverter and converter modules

 Preparation
• Disconnect the external power supply cables (R/L1, S/L2, T/L3) and motor cables (U, V, W).
• Prepare a continuity tester. (For the resistance measurement, use the 100 Ω range.)
 Checking method
Change the polarity of the tester alternately at the inverter terminals R/L1, S/L2, T/L3, U, V, W, P/+, and N/- and check the
electric continuity.
NOTE
• Before measurement, check that the smoothing capacitor is discharged.
• At the time of electric discontinuity, the measured value is almost ∞. When there is an instantaneous electric continuity, due
to the smoothing capacitor, the tester may not indicate ∞. At the time of electric continuity, the measured value is several Ω to
several tens of Ω. When all measured values are almost the same (although values may not be constant depending on the
tester type), it shows that there are no electrical paths with problems.
 Module device numbers and terminals to be checked
Converter module
Inverter module
(Assuming that an analog meter is used.)
43
3. Precautions for Maintenance and Inspection
3.1 Inspection item
Description
• Check that indications are correct.
• Check for stains.
Check that readouts are correct.
Check for vibration and abnormal increase in operation
noise.
Tester polarity
R/L1 P/+
D1
P/+ R/L1
S/L2 P/+
D2
P/+ S/L2
T/L3 P/+
D3
P/+ T/L3
U P/+
TR1
P/+ U
V P/+
TR3
P/+ V
W P/+
TR5
P/+ W
Inspection
interval
Daily Periodic
○
○
○
○
Continuity
No
D4
Yes
No
D5
Yes
No
D6
Yes
No
TR4
Yes
No
TR6
Yes
No
TR2
Yes
Corrective action
at fault
*3
occurrence
Contact the
manufacturer.
Clean.
Stop the
equipment and
contact the
manufacturer.
Stop the
equipment and
contact the
manufacturer.
Tester polarity
Continuity
R/L1 N/- Yes
N/- R/L1 No
S/L2 N/- Yes
N/- S/L2 No
T/L3 N/- Yes
N/- T/L3 No
U N/- Yes
N/- U No
V N/- Yes
N/- V No
W N/- Yes
N/- W No
Check by
user