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PLC UV Control
PLC
switching may be driven by manual switch, relay, or optical coupler. Only analog intensity uses a voltage input to the PLC.
To use the PLC mode inputs, the
PLC ENABLE
pin 12 must be pulled down to low by grounding to the PLC return,
PLC GND
or a
COM
ground point
The PLC can control the UV on/off using the
LED ON/OFF
input Pin 6. When this input is pulled down by grounding to
COM
ground, the UV LED will turn on.
The PLC can also control the intensity of the UV output.
•
When the
INTENSITY IN/EXT
input Pin 7 is pulled down low by grounding to
COM
ground, the Intensity will be
controlled by the
EXTERNAL
ANALOG INTENSITY
input voltage.
•
The
ANALOG INTENSITY
input, Pin 3, is an analog voltage input. The voltage range is 0 to 10VDC.
Any setting 1 VDC or below will set the Intensity to 10% and each additional volt increases intensity by 10%. (Example: 5V =
50%, 7.5V = 75%, 10V = 100%) All three PLC inputs,
LED ON/OFF, INTENSITY IN/EXT
and
ANALOG INTENSITY
work in PLC
mode only. They are ignored in other working modes. The example connection for the PLC control signal is shown in Figure 19.
Figure 19.
PLC Connection
