Diablo Controls DSP-15, Руководство пользователя

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DSP-15 User Manual Page 9 of 23 DSP15_MAN_C
Frequency (DIP Switches 1 and 2)
Another important variable is loop frequency. When loops are installed sufficiently far apart, any two loops will
not interfere with each other. However, if two loops are fairly close together, say two to four feet apart, the
inductive fields may couple together and may interact causing intermittent false detections. The two main
variables for inductive coupling are distance and frequency separation. To aid in avoiding inductive coupling,
each DSP-15 unit comes with two frequency switches. They are binary coded allowing up to four different
frequencies to operate within. If there are suspicions that one of the two loops are interacting, simply change
one of the two unit’s frequency settings.
DIP Switch
Frequency
1 2
OFF OFF High
OFF ON Medium High
ON OFF Medium Low
ON ON Low
Fail Memory (DIP Switch 3)
Normal operation is that during a loop failure, the green Power LED will indicate what type of loop failure (open,
short, or large ΔL/L). During the loop failure the red Detect LED and output A will be active for fail-safe
operation or inactive for fail-secure operation. If the loop recovers from its failure, the red and green LEDs,
along with its two relay outputs, will operate normally again. However, when Fail Memory is enabled, the green
LED will continue to indicate a previous failure by blinking 1850 milliseconds on, 50 milliseconds off, 50
milliseconds on again, and then 50 milliseconds off. This blinking sequence will repeat until a reset or power
cycle occurs. Note that the red LED and relay outputs will continue to work normally.
Extended Presence (DIP Switch 4)
Under normal conditions, the DSP-15 will hold a vehicle presence for a reasonable amount of time. If a vehicle
parks over the loop and the detector measures a 1% ΔL/L, it will slowly tune that vehicle out over a period of
about one hour. For those instances where a longer period is desired, extended presence will hold that same
vehicle for about 19 or 20 hours. This is quite a long time, but it isn’t infinite. The DSP-15 does not have infinite
presence.