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13
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, the
PLC ENABLE
(input pin 1) must be pulled down to low by grounding to the
COM
ground point
The PLC
INTERLOCK
(input Pin 11) disables all the UV output when it is de-asserted. It is pulled down before other control
signal in PLC mode.
The PLC
INHIBIT 1
(input Pin 7) and
INHBIT 2
(input Pin 9) disables each channel
’s
UV output when it is de-asserted. After the
INTERLOCK is
pulled down, the
INHIBIT 1
or
INHIBIT 2
is also pulled down.
After above signals are pulled down, the PLC can control the UV on/off using the Emitter 1 ON (input Pin 3) or Emitter 2 ON
(input Pin 5). 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
PRG/EXT
(input Pin 13) is pulled down low by grounding to
COM
ground, the Intensity will be controlled by
the EXTERNAL ANALOG INTENSITY input voltage.
•
The
ANALOG INPUT (
input
Pin 12) is an analog voltage input. The voltage range is 0 to 10VDC.
Any setting below 1 VDC will set the Intensity to 0% and each 1V additional volt increases intensity by 10%. (Example: 1V =
10%, 5V = 50%, 10V = 100%). The example connection for the PLC control signal is shown in Figure 14.
Figure 14.
PLC Connection Example
