Checking The Inverter And Converter Modules - Mitsubishi Electric FR-CS84-012 Instruction Manual

7.1.4

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/- to 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
Converter module
Inverter module
(Assuming that an analog tester is used.)
230
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.1 Inspection item
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
Converter module
D1 D2 D3
R/L1
S/L2
T/L3
D4 D5 D6
Continuity
No
D4
Yes
No
D5
Yes
No
D6
Yes
No
TR4
Yes
No
TR6
Yes
No
TR2
Yes
P/+
Inverter module
TR1 TR3 TR5
C
TR4 TR6 TR2
N/-
Tester polarity
R/L1 N/-
N/- R/L1
S/L2 N/-
N/- S/L2
T/L3 N/-
N/- T/L3
U N/-
N/- U
V N/-
N/- V
W N/-
N/- W
U
V
W
Continuity
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No