Omron 3G3RX - Page 361

6-8
6-1 Inspection and Maintenance
6
Inspection and Maintenance
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  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)
Converter unit
D1
R/L1 PD/+1 No conduction
PD/+1 R/L1 Conduction
D2
S/L2 PD/+1 No conduction
PD/+1 S/L2 Conduction
D3
T/L3 PD/+1 No conduction
PD/+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
Inverter unit
TR1
U/T1 P/+ No conduction
P/+ U/T1 Conduction
TR2
V/T2 P/+ No conduction
P/+ V/T2 Conduction
TR3
W/T3 P/+ No conduction
P/+ 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 circuit
TR7
RB P/+ No conduction
P/+ RB Conduction
RB N/- No conduction
N/- RB No conduction
Converter unit
PD/+1 P/+ RB
Regenerative
braking circuit
D1 D2 D3
R/L1
S/L2
T/L3
D4 D5 D6
C
N/-
TR7
Inverter unit
TR1
TR2 TR3
U/T1
V/T2
W/T3
TR4 TR5 TR6