304UM0001 Rev 00
PD160 Enhanced Series User Manual
Page: 13 of 39
3.2.4 Presence
The presence setting determines how the detector handle detects.
There are two modes to choose from, namely permanent presence
and limited presence.
Permanent presence mode is aimed at maintaining the presence of a
vehicle over the loop by continuously compensating for all
environmental changes. This is used in situations where safety is
involved and the detector is required to maintain the detect.
Limited presence, however, is aimed at limiting the presence of a vehicle over the loop. This is used in
situations where statistics or control is involved and a vehicle parked over the loop should not prevent
continued operation. The presence is limited to approximately one hour for a 1%
∆
L/L.
The presence mode can be toggled between permanent and limited presence via the presence menu.
In addition to the mode selected, a time-out may be set which operates in both modes. The time-out
selections range from 0 (off) to 60 minutes. If limited presence is selected and a time-out is defined,
the first time to expire will release the detect, effectively tuning out the vehicle’s presence. In this way,
subsequent vehicles travelling over the loop may be processed.
Setting
0 sec
(Off)
30 sec
1 min
4 min
10 min
20 min
40 min
60 min
Presence
(Permanent or Limited)
3.2.5 Relay
The PD160 Enhanced Series provides user defineable outputs on each relay. The detector setup
allows for relay outputs to be generated in the event of a vehicle entering, being present on or exiting
the loop.
The relay menu allows for complete customisation of the outputs.
After selecting which relay to adjust, each relay output may be set to
any possible combination of presence event, or pulse event (i.e.
pulse on detect or un-detect), pulse duration and output delay. Only
once a final presence or pulse setting has been selected will the new
setting take effect.
Whether the relay is activated on presence or a pulse signal is selected, the delay time and fail-safe /
secure settings for the channel can also be adjusted. A detect is classified as the entry of a vehicle
onto the loop, where an un-detect is the exit of the vehicle from the loop.
