Omron SYSDRIVE MX2 SERIES User Manual page 390

8-1 Inspection and Maintenance
Before checking, measure the voltage between P/+2 and N/− at DC voltage range in advance, and
confirm that the smoothing capacitor is sufficiently discharged.
A nearly infinite value is shown in a no-conduction state. (The value shows the range from a few
to a few dozen Ω in a conduction state.)
However, the value may not be infinite if the momentous conduction occurs through the influence
of the smoothing capacitor.
The Inverter or converter is in good shape if the values from various parameters are nearly equal,
though they are not consistent depending on the types of elements or testers.
TR1
TR2
8
TR3
TR4
TR5
TR6
TR7
8-7
Tester
polarity
Measurement
value
−
+
(red) (black)
R/L1 +1 No conduction
D1
+1 R/L1 Conduction
S/L2 +1 No conduction
D2
+1 S/L2 Conduction
T/L3 +1 No conduction
D3
+1 T/L3 Conduction
R/L1 N/− Conduction
D4
N/− R/L1 No conduction
S/L2 N/− Conduction
D5
N/− S/L2 No conduction
T/L3 N/− Conduction
D6
N/− T/L3 No conduction
U/T1 P/+2 No conduction
P/+2 U/T1 Conduction
V/T2 P/+2 No conduction
P/+2 V/T2 Conduction
W/T3 P/+2 No conduction
P/+2 W/T3 Conduction
U/T1 N/− Conduction
N/− U/T1 No conduction
V/T2 N/− Conduction
N/− V/T2 No conduction
W/T3 N/− Conduction
N/− W/T3 No conduction
RB P/+2 No conduction
P/+2 RB Conduction
RB N/− No conduction
N/− RB No conduction
Regenerative braking unit
Converter unit +1 P/+2
D1 D2 D3
R/L1
S/L2
C
T/L3
D4 D5 D6
N/−
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-Axxxx)
RB
Inverter unit
TR1 TR2
TR7
TR4 TR5
TR3
U/T1
V/T2
W/T3
TR6