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Hitachi hitachi series inverter Manuel D’Utilisation

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CAUTION: Be sure to diode in between "P24" and "PLC" when connecting plural 
inverters with digital input wiring in common. 
 
 
The power to the inverter control part can be supplied externally as shown below. Except 
driving motor, it is possible read and write the parameters by keypad and via 
communication even the drive itself is not powered. 
By having ability 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. To 
avoid this closed circuit, please put the diode (rated:50V/0.1A) in the path as described 
below. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Jumper 
wire
 
Inserting 
diode
P24
PLC 
L
1
P24
PLC 
L
1
Switch 
OFF 
Power ON 
Power OFF 
Input 
ON 
P24
PLC 
L
1
P24 
PLC
L 
1
Switch 
OFF 
Power ON 
Power OFF 
Input 
OFF 
Jumper 
wire
1
Switch 
OFF 
Switch 
OFF
Input 
OFF 
Input 
ON 
P24 
PLC 
L 
P24 
PLC 
L 
P24 
PLC 
L 
P24 
PLC 
L 
1 
1 
1 
Jumper 
wire
 
 
In case of Source logic 
 
Jumper 
wire