24
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
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
Short
bar
1
Switch
OFF
Switch
OFF
Input
OFF
Input
ON
P24
PLC
L
P24
PLC
L
P24
PLC
L
P24
PLC
L
1
1
1
Short
bar
In case of Source logic
Short
bar