
PLZ-4WL
89
5
Ext
e
rnal
C
ontr
o
l
Turning the Load On and Off through External Control
You can use an external control signal to turn the load on and off, and you can check whether
the load is on or off.
Signal Input for turning the load on and off
To turn the load on and off using an external contact, you need to apply an external signal
across pin 9 and 15 or 9 and 16 of the J1 connector.
When you turn the load off through an external contact, the LOAD key on the front panel
becomes invalid.
You can select the logic (LOW or HIGH) to use to turn the load on and off using the menu
setup. Select “2. Configuration” > “3. External” > “Load On Input.” Turn the power switch off
and then on again to enable the settings.
If you are not going to control the output using an external contact, set the logic to “HIGH”
(the default setting).
The input pin is pulled up to the internal circuit’s +5 V level by a resistor that is approximately
10 k
. The maximum allowable voltage is 5 V. The logic threshold levels are CMOS.
See
On
Off
H = On
L = Off
▼ indicates that the LOAD key has been pressed.
The LOAD has been
turned on by the
external contact, so
the load key is valid.
The LOAD key is invalid.
Even if the LOAD key is
pressed, the load will
not turn on.
For the external contact
to turn the load on again,
the load must first be
turned off once.
External
contact
Load
Example when the load is turned
on by a high level signal from the
external contact
Load On Input
External Contact
ON (closed)
OFF (open)
LOW
Load on
Load off
HIGH
Load off
Load on
+5 V
Approx. 10 kΩ
A COM
LOAD ON/OFF
CONT
J1
S
W
9
15,16