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Inspection item
88
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
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). (The inverter and the converter
unit (FR-CC2) can be measured with those cables connected.)
• Prepare a tester. (For the resistance measurement, use the 100 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 to
several tens of . 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
(Assumes the use of an analog meter.)
Tester
polarity
Result
Tester
polarity
Result
Converter
module
D1
R/L1, P/+ Discontinuity
D4
R/L1, N/- Continuity
P/+ R/L1, Continuity N/- R/L1, Discontinuity
D2
S/L2, P/+ Discontinuity
D5
S/L2, N/- Continuity
P/+ S/L2, Continuity N/- S/L2, Discontinuity
D3
T/L3 P/+ Discontinuity
D6
T/L3 N/- Continuity
P/+ T/L3 Continuity N/- T/L3 Discontinuity
Inverter
module
TR1
U P/+ Discontinuity
TR4
U N/- Continuity
P/+ U Continuity N/- U Discontinuity
TR3
V P/+ Discontinuity
TR6
V N/- Continuity
P/+ V Continuity N/- V Discontinuity
TR5
W P/+ Discontinuity
TR2
W N/- Continuity
P/+ W Continuity N/- W Discontinuity
Converter module Inverter module
D1 D2 D3
D4 D5 D6
TR1 TR3 TR5
TR4 TR6 TR2
U
V
W
R/L1
S/L2
T/L3
C
C
P/+
N/-
P/+
N/-