Mitsubishi Electric 800 Series Instruction Manual page 102

5.1.4
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 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
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.)
5.1.5
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 and parameter unit is vulnerable to detergent and alcohol. Therefore, avoid using
them for cleaning.
Tester
polarity
Result
R/L1 N/-
D4
N/- R/L1
S/L2 N/-
D5
N/- S/L2
T/L3 N/-
D6
N/- T/L3
U N/-
TR4
N/- U
V N/-
TR6
N/- V
W N/-
TR2
N/- W
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Result
Converter module
Continuity
D1 D2
Discontinuity
Continuity
R/L1
Discontinuity
S/L2
Continuity
Discontinuity
T/L3
Continuity
Discontinuity
D4 D5
Continuity
Discontinuity
Continuity
Discontinuity
Inspection item
P/+
Inverter module
TR1 TR3 TR5
D3
C
D6
TR4 TR6 TR2
N/−
U
V
W
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