304UM0001 Rev 00
PD160 Enhanced Series User Manual
Page: 22 of 39
4.3.2 Pulse Output
When configured as a pulse output, the relay will output a pulse according to the pulse duration setting
(default is 150ms). The output may be set to be any of the following:
•
Pulse on detect – the detector will give a pulse output on detection of a vehicle.
•
Pulse on un-detect – the detector will give a pulse output when the vehicle leaves the loop.
•
Pulse on fault – the detector will give a pulse output when the channel goes into fault.
Pulse outputs are fail-secure outputs and will not operate if a failure occurs. By default on the PD160,
relay2 is configured as a presence output and so is a fail-secure output.
4.4 Response Times
The response time of the detector is the time taken from when a vehicle moves over the loop to when
the detector gives an output.
The response times of the PD160 have been adjusted to prevent false operation in electrically noisy
environments, but retain adequate response to vehicles in parking and vehicle access control
applications.
The response time will be proportional to the level of sensitivity, the level of the detect and the speed
of the vehicle. In other words, a fast moving large detect will respond quicker than a slow moving small
detect. Also, if the sensitivity is set very low, the point at which it crosses the threshold will be later
than higher sensitivity settings. At maximum sensitivity however, the response time is slower than
other sensitivity levels to prevent false operation from noisy environments.
