PP420 LED lighting controllers - User Manual
5.1.3
Switched
In switched mode, you can use a trigger input to switch the output current
on and off. The output is enabled only when the input has a voltage on it.
5.2
Triggers
There are four trigger inputs, as summarised in the table below. The sense
of these can be either active high or active low depending on how the 'P'
flag is set. The 'P' flag inverts the sense of the trigger (see
).
Mode
Trigger input
Output
Continuous
N/A
Output is on.
Switched
Trigger = 0V
Output is off.
Trigger = 4.5V to 24V
Output is on.
Pulsed
Trigger goes from
0V to 4.5V
Pulse is triggered.
Trigger goes from
4.5V to 0V
No action.
5.3
Flags
Flags can be set on each channel as follows:
S flag:
This flag enables or disables autosensing (see
). When set, the PP420 senses a light connected to
it for the first time and will wait for the current rating to be set. If the flag is
not set, the PP420 will revert to the last current rating set.
E flag:
This flag enables or disables error checking. If the flag is not set the
PP420will not detect lighting errors.
Pflag:
This flag inverts the trigger sense. In pulse mode with the P flag set,
the PP420 triggered on the rising edge of the trigger pulse. If the flag is not
set, it triggers on the falling edge. The falling edge may give a slower
response time. In switched mode with the P flag set, the output is on when
the input is on. Clearing the P flag inverts this operation.
5.4
Automatic light sensing
When a channel does not have a light connected, the PP420 continually
tries to output a small amount of current. When a light is connected , it
flashes for a short time (the light is not damaged by this) until the PP420
detects that it is connected. You will then need to set up the current rating
of the light (see
Section 1, Front panel configuration
).
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