Omron SYSDRIVE RX Series User Manual page 345

Note 2: A nearly infinite value is shown in a no-conduction state.
However, the value may not be infinite if the momentary conduction occurs through the influence
of the smoothing capacitor
The value shown ranges from a few to a few dozen Ω in a conduction state.
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.
Note 3: The regenerative braking circuit is provided for Inverters with a capacity of 22 kW or lower.
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
TR1
P/+2 U/T1 Conduction
V/T2 P/+2 No conduction
TR2
P/+2 V/T2 Conduction
W/T3 P/+2 No conduction
TR3
P/+2 W/T3 Conduction
U/T1 N/- Conduction
TR4
N/- U/T1 No conduction
V/T2 N/- Conduction
TR5
N/- V/T2 No conduction
W/T3 N/- Conduction
TR6
N/- W/T3 No conduction
RB P/+2 No conduction
P/+2 RB Conduction
TR7
RB N/- No conduction
N/- RB No conduction
+1 P/+2 RB
Converter unit
D1 D2 D3
R/L1
S/L2
C
T/L3
D4 D5 D6
N/-
6-1 Inspection and Maintenance
Inverter unit
TR2
TR1
TR7
TR4 TR5
Regenerative
braking circuit
TR3
U/T1
V/T2
W/T3
6
TR6
6-8