STEP ET Series - Anti-Interference Measures; Connect a Special Noise Filter on the Output Side

Chapter 4 Wiring of Inverter
Shanghai Sigriner STEP Electric Co., Ltd.
- 42 -
U/T1
V/T2
W/T3
DC+
R/L1
S/L2
T/L3
DC-
+
-
R
T
S
Energy feedback device
RG
Figure 4-12 External energy feedback device
4.3.4.7 Inverter output terminals (U/T1, V/T2, W/T3)
 The inverter output terminals U/T1, V/T2, W/T3 are connected to the motor terminals
U/T1, V/T2, W/T3. If the motor rotates in the wrong direction, please exchange the wiring
of any two phases of the inverter output terminal or motor terminal.

It is strictly forbidden to connect the power input to the inverter output terminals U/T1,
V/T2, W/T3.

It is strictly forbidden to ground or short circuit the output terminals.
 It is strictly forbidden to connect capacitors or surge filters on the output side of the
inverter. As the output of the inverter has high harmonics, the output side connected the
capacitor or surge filter will make the inverter overheat and damage.
 The diagram of forbidding the capacitor to be connected to the output side of the inverter
is shown in Figure 4-13.
V/T2
U/T1
M
W/T3
Figure 4-13: The capacitor is strictly prohibited to be connected on the output side
4.4 Anti-interference measures
4.4.1 Connect a special noise filter on the output side
To suppress the noise generated on the output side of the inverter, a special noise filter can be
connected to the output side of the inverter. The wiring of the noise filter on the output side of the
inverter is shown in Figure 4-14.