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Hitachi WJ200-004M Quick Reference Manual page 25

Wj200 series
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CAUTION: Be sure to install a diode in between "P24" and "PLC" when connecting
multiple inverters with digital input wiring in common.
The power to the inverter control circuits can be supplied externally as shown below. It is
possible to read and write parameters via the keypad with control power supplied in
this way, even though the drive itself is not powered. However it is NOT possible to
drive the motor.
To allow this capability, the inverter does not block current inflow to the control inputs.
When two or more inverters are connected together with common I/O wiring in this way,
it may result in unwanted activation of inputs. The use of diodes (rated 50V, 0.1A) as
shown will avoid this problem.
Short
bar
P24
PLC
L
1
Short
bar
P24
PLC
L
1
Switch
OFF
P24
Short
PLC
bar
L
1
P24
PLC
L
Short
bar
1
Switch
OFF
Power ON
Input
ON
Inserting
diode
Power OFF
In case of Source logic
Input
ON
24
Power ON
P24
PLC
L
Input
1
Power OFF
P24
PLC
L
1
Switch
OFF
P24
PLC
L
Input
OFF
1
P24
PLC
L
1
Switch
OFF
OFF

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