Inverter doesn’t block the current flowing into itself when it is not powered. This may cause the closed circuit when two or more inverters are connected to common I/O wiring as shown below to result in unexpected turning the on the input. This may lead to dangerous situation. To avoid this closed circuit, please put the diode (rated:50V/0.1A) in the path as described below.

In case of Source logic

 

 

 

 

Jumper

Power ON

 

Power ON

P24

 

 

P24

 

wire

 

 

 

 

PLC

 

 

PLC

 

 

L

 

 

L

 

 

 

Input

Inserting

1

Input

 

1

ON

OFF

 

 

 

diode

 

 

Jumper Power OFF

 

Power OFF

wire P24

 

 

P24

 

 

PLC

 

 

PLC

 

 

L

 

 

L

 

 

1

 

 

1

 

Switch

 

 

 

Switch

 

OFF

 

 

 

OFF

 

 

P24

 

 

P24

 

Jumper

PLC

 

 

PLC

 

wire

L

 

 

L

 

 

1

Input

 

 

Input

 

ON

 

1

OFF

Jumper wire P24

PLC

L

1

Switch

OFF

P24

PLC

L

1

Switch

OFF

96

Page 98
Image 98
Hitachi hitachi series inverter user manual Off