Checking The Inverter Module And The Converter Module; Cleaning - Mitsubishi Electric 800 Series Instruction Manual

7.1.4
Checking the inverter module and the converter
module
Preparation
• Disconnect the external power supply cables (R/L1, S/L2, T/L3) and motor cables (U, V, W).
• Prepare a 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. If all measured values are almost the same, although these values are not constant depending on the
module type and tester type, the modules are without fault.
Module device numbers and terminals to be checked
Tester
polarity
Result
R/L1 P/+ Discontinuity
D1
P/+ R/L1 Continuity
S/L2 P/+ Discontinuity
D2
P/+ S/L2 Continuity
T/L3 P/+ Discontinuity
D3
P/+ T/L3 Continuity
U P/+ Discontinuity
TR1
P/+ U Continuity
V P/+ Discontinuity
TR3
P/+ V Continuity
W P/+ Discontinuity
TR5
P/+ W Continuity
(Assumes the use of an analog meter.)
7.1.5

Cleaning

Always run the inverter in a clean status.
When cleaning the inverter, gently wipe dirty areas with a soft cloth immersed in neutral detergent or ethanol.
NOTE
• Do not use solvent, such as acetone, benzene, toluene and alcohol, as these will cause the inverter surface paint to peel off.
• The display, etc. of the operation panel (FR-LU08) and parameter unit (FR-PU07) are vulnerable to detergent and alcohol.
Therefore, avoid using them for cleaning.
Tester
polarity
Result
R/L1 N/- Continuity
D4
N/- R/L1 Discontinuity
S/L2 N/- Continuity
D5
N/- S/L2 Discontinuity
T/L3 N/- Continuity
D6
N/- T/L3 Discontinuity
U N/- Continuity
TR4
N/- U Discontinuity
V N/- Continuity
TR6
N/- V Discontinuity
W N/- Continuity
TR2
N/- W Discontinuity
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
P/+
Converter module
D1 D2 D3
R/L1
C
S/L2
T/L3
D4 D5 D6
N/−
Inspection item
Inverter module
TR1 TR3 TR5
U
V
W
TR4 TR6 TR2
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