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• Checking the converter module
<Preparation>
(1) Disconnect the external power supply cables (R4, S4, T4, N, P).
(2) Prepare a tester. (Use 1 range.)
<Checking method>
Change the polarity of the tester alternately at the main circuit terminals R4, S4, T4, P and N of the converter,
and check for continuity.
<Module device numbers and terminals to be checked>
Note: 1.Before measurement, check that the smoothing capacitor is discharged.
2.At the time of discontinuity, the measured value indicated is a nearly infinite value. Due to the
influence of the smoothing capacitor, continuity may be instantaneously established and infinite not
indicated. At the time of continuity, the measured value is several to several ten ohms depending
on the module type, tester type, etc. If all measured values are almost the same, the modules are
without fault.
Ω
D1 D2 D3
R4
S4
T4
D4
D5
D6
C
P
N
(Assumes the use of an analog meter.)
Tester Polarity
Measured
Value
Converter module
D1
R4 P Discontinuity
P R4 Continuity
D2
S4 P Discontinuity
P S4 Continuity
D3
T4 P Discontinuity
P T4 Continuity
D4
R4 N Continuity
N R4 Discontinuity
D5
S4 N Continuity
N S4 Discontinuity
D6
T4 N Continuity
N T4 Discontinuity