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2 Design
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
2-3 Wiring
2
2-3-5 Wiring for Control Circuit Terminals
Precaution for using more than one inverter
If more than one inverter uses a common input (such as a switch), and their power-on timing is
different, a sneak current will flow in the circuit as shown below. This may cause the inverters to
falsely recognize the input signal is ON even if it is OFF. If this occurs, insert a diode (rating:
50 V/0.1 A) in the position shown in the diagram or redesign the circuit to use an external power
supply to prevent sneak current.
For sink logic
Precaution for Wiring Control Circuit Terminals
Add a diode
Use an external
power supply
P24
PSC
SC
S1
Short-circuit
wire
P24
PSC
SC
S1
Switch OFF
With no diode inserted, the input turns
ON due to sneak current even when the
switch is OFF.
Power ON
Power OFF
Short-circuit
wire
Input
ON
P24
PSC
SC
S1
P24
PSC
SC
S1
Switch OFF
In place of short-circuit bar, insert a
diode to prevent sneak current.
Power ON
Power OFF
Input
OFF
P24
PSC
SC
S1
P24
PSC
SC
S1
Switch OFF
The use of an external power supply
with the short-circuit bar removed does
not cause sneak current.
Power ON
Power OFF
Input
OFF
24-VDC
Power
supply
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