Omron SYSDRIVE MX2 SERIES, User Manual

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11 Maintenance and Inspection
11 - 8 Multi-function Compact Inverter 3G3MX2-V1 User’s Manual (I585-E1)
Measure the resistance at the inverter main circuit terminals block R/L1, S/L2, T/L3, U/T1, V/T2, W/T3,
RB, P/
+
2, and N/
−
by alternating the polarity of the tester to judge the conduction state.
• Before starting the test, measure the voltage between P/
+
2 and N/
−
in the DC voltage range to check
that the smoothing capacitor is sufficiently discharged.
• The tester will show nearly infinite resistance in a no-conduction state. (With conduction, the tester
will show a resistance from a few
Ω
to several tens of
Ω
.)
However, it may not show infinite resistance if a momentary conduction is detected due to the influ-
ence of the smoothing capacitor.
The inverter or converter unit is in good condition if the measured value for each item in the following
table is nearly equal, although it does not match exactly because of the element type, tester type, and
so on.
Test Method
Tester polarity
Measurement
result
+
(Red)
−
(Black)
Converter
unit
D1
R/L1
+
1 No conduction
+
1 R/L1 Conduction
D2
S/L2
+
1 No conduction
+
1 S/L2 Conduction
D3
T/L3
+
1 No conduction
+
1 T/L3 Conduction
D4
R/L1 N/
−
Conduction
N/
−
R/L1 No conduction
D5
S/L2 N/
−
Conduction
N/
−
S/L2 No conduction
D6
T/L3 N/
−
Conduction
N/
−
T/L3 No conduction
Tester polarity
Measurement
result
+
(Red)
−
(Black)
Inverter
unit
TR1
U/T1 P/
+
2 No conduction
P/
+
2 U/T1 Conduction
TR2
V/T2 P/
+
2 No conduction
P/
+
2 V/T2 Conduction
TR3
W/T3 P/
+
2 No conduction
P/
+
2 W/T3 Conduction
TR4
U/T1 N/
−
Conduction
N/
−
U/T1 No conduction
TR5
V/T2 N/
−
Conduction
N/
−
V/T2 No conduction
TR6
W/T3 N/
−
Conduction
N/
−
W/T3 No conduction
Regenerative
braking unit
TR7
RB P/
+
2 No conduction
P/
+
2 RB Conduction
RB N/
−
No conduction
N/
−
RB No conduction
+
1
D1
D4
D2
D5
D3
D6
R/L1
S/L2
T/L3
C
P/
+
2
N/
−
TR7
RB
U/T1
V/T2
W/T3
TR1 TR2 TR3
TR4 TR5 TR6
Inverter unit
Regenerative braking unit
Converter unit