GARDASOFT VTR1, User Manual, Page: 8 / 24

8
Low voltage and mains wiring should be routed separately. If they must be loomed together
ensure that low voltage insulation rating is sufficient or that supplementary insulation is used.
Power supply cable length is recommended not to exceed 3m. If longer cables are fitted, or if
surge or transient interference greater than +/-60V may occur on the power supply lines,
additional surge protection should be provided.
6.2 Trigger Input Option
There is an optional opto-isolated trigger input. The opto-isolator isolates voltages up to 50V.
Signal Function
TRGI –ve Trigger input –ve.
TRGI +ve Trigger input +ve.
The trigger input circuit is as follows:
The trigger input circuit operates as follows:
When a voltage of 5V to 24V is applied across TRGI –ve and TRGI +ve, the trigger input is
logic 1 (on). When a voltage of 0V to 2V is applied across TRGI –ve and TRGI +ve, the trigger
input is logic 0 (off).
The trigger input takes about 3mA at all voltages from 5V to 24V.