Diablo DSP-22-2 User Manual Download Page 9 | Manualshive

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Diablo DSP-22-2 User Manual Download Page 9

DSP-22-2 User Manual

Page 9 of 25

DSP-22-2_MAN_A

without having to be overly sensitive and susceptible to false detections. NOTE: If detection of high-bed tractor-
trailers is required, correctly sized loops must be used.

DIP

Switch 3

Function

OFF

Channel 1 Normal Sensitivity

ON

Channel 1 Sensitivity Boost

Channel 1 – Frequency (S3 DIP Switches 1 and 2)

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 main variables for inductive coupling are loop size, distance
between loops, and the loop frequency.  Loops that are connected to the same DSP-22-2 detector can not interfere
with each other, as the detector will only turn on one of the loops at any point in time (this is referred to as
scanning).  To aid in mitigating inductive coupling, each DSP-22-2 unit comes with two frequency switches for each
channel.  They are binary coded allowing up to four different operating frequencies.

If there are suspicions that loops are interacting, change one of the detector’s frequency settings for the suspect
channel so that their inherent frequencies are sufficiently different as to no longer interact. If the loops are the
same size and number of turns, setting one channel to high and the other channel to low will provide the maximum
frequency separation.

DIP Switch

Frequency

1

2

OFF

OFF

Channel 1 High

OFF

ON

Channel 1 Medium High

ON

OFF

Channel 1 Medium Low

ON

ON

Channel 1 Low

Channel 2 – Sensitivity (DIP Switches 4 and 5)

Channel 1 has four possible sensitivity levels.  In most situations the sensitivity setting medium high (DIP switch 1
OFF and DIP switch 2 ON) will work effectively. For those situations where this setting is not sensitive enough,
raise the sensitivity. For those situations where the detector is overly sensitive, lower the sensitivity one level at
a time until the desired performance is obtained.  Remember that semi-trucks look much smaller than a car.  So,
do not set or test the sensitivity using a passenger vehicle if semi-truck traffic will be seen over the loop.  The
factory default is low (DIP switch 1 OFF and DIP switch 2 OFF).

Like most inductive loop vehicle detectors, the DSP-22-2 directly measures the change in frequency of the loop
and from there, calculates the change in inductance when a vehicle interacts with it. The change in inductance is

measured as %ΔL/L (reads as “percent delta L over L”).

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Summary of Contents for DSP-22-2

Page 1: ...DSP 22 2_MAN_A 07 20 18 Page 1 of 25 Pros Who Know Trust Diablo User Manual DSP 22 2 Low Power Dual Channel Vehicle Detector with Support for the Mini Loop Probe ...

Page 2: ...Presence Pulse DIP Switch 7 10 Channel 2 Loop Probe DIP Switch 8 11 Channel 2 Frequency S3 DIP Switches 3 and 4 11 Indicators 12 3 Installation 15 General Rules and Best Practices for Inductive Loops 15 Detector Installation 16 Loop Installation 17 Mini Loop Probe Installation 20 4 Troubleshooting 22 No Power LED 22 Detect LED Flashes On Once Every Two Seconds 22 Detect LED Flashes On Twice Every ...

Page 3: ... DSP 22 2_MAN_A Figures Figure 1 Product Views 4 Figure 2 Physical Dimensions 7 Figure 3 Loop Installation 19 Figure 4 Saw Cut for Home Run Exit and Chiseled Corner for Home Run Exit 19 Figure 5 Typical Mini Loop Probe Installation 20 ...

Page 4: ... The detector is powered by a high performance 8 bit microcontroller that does not skimp on performance The DSP 22 2 detector has a small footprint and was designed to directly plug into many DoorKing operators The detector uses a 3 pin Molex connector for its power connections and the Channel 1 solid state output The Channel 2 relay outputs have separate screw terminals for wired connections Figu...

Page 5: ...r frequency settings available The actual loop frequency is dependent on loop circuit inductance Channel 1 S3 DIP Switch Frequency 1 2 OFF OFF High ON OFF Medium High OFF ON Medium Low ON ON Low Channel 2 S3 DIP Switch Frequency 3 4 OFF OFF High ON OFF Medium High OFF ON Medium Low ON ON Low B Pulse Output 250ms 15ms Response Time 181 ms typical 314 ms worst case Vehicle Hold Time Both channels wi...

Page 6: ...oltage 30 volts Maximum Voltage Drop Across Active Output 0 3 volts Relay Output Rating 30 VDC 2 amps resistive 110 VDC 0 3 amps resistive 125 VAC 0 5 amps resistive Current Draw No Channel in Detect 1 62 milliamps typical 20VDC Channel 1 in Detect 23 94 milliamps typical 20VDC Channel 2 in Detect 30 75 milliamps typical 20VDC Both Channels in Detect 33 60 milliamps typical 20VDC Environmental Dat...

Page 7: ... of 25 DSP 22 2_MAN_A Mechanical Data Mounting Position Any Housing Material Lexan Detector Size 4 300 inches High x 2 950 inches Wide x 820 inches Deep 109 22 mm High x 74 93 mm Wide x 20 83 mm Deep Figure 2 Physical Dimensions ...

Page 8: ...the detector is overly sensitive lower the sensitivity one level at a time until the desired performance is obtained Remember that semi trucks look much smaller than a car So do not set or test the sensitivity using a passenger vehicle if semi truck traffic will be seen over the loop The factory default is low DIP switch 1 OFF and DIP switch 2 OFF Like most inductive loop vehicle detectors the DSP...

Page 9: ...he detector s frequency settings for the suspect channel so that their inherent frequencies are sufficiently different as to no longer interact If the loops are the same size and number of turns setting one channel to high and the other channel to low will provide the maximum frequency separation DIP Switch Frequency 1 2 OFF OFF Channel 1 High OFF ON Channel 1 Medium High ON OFF Channel 1 Medium L...

Page 10: ...l 2 is only available in the inductive loop mode of operation DIP switch 8 OFF If channel 2 is in the probe mode of operation only pulse on entry operation is available regardless of the setting of DIP switch 7 In the Presence mode of operation once activated the output will remain activated for as long as a vehicle is detected over the loop After four minutes of continuous detection the detector ...

Page 11: ...e factory default is the inductive loop mode DIP Switch 8 Sensor Type OFF Channel 2 Inductive Loop ON Channel 2 Free Exit Probe NOTE In the probe mode of operation the Channel 2 will only hold a detection for 1 second Therefore if a vehicle stays over the sensor for more than 1 second it may generate additional pulses for the same vehicle Channel 2 Frequency S3 DIP Switches 3 and 4 When loops are ...

Page 12: ...he detector is in its high speed mode of operation Low Power Operation The LED will blink on once every 2 seconds when the detector is in its low power mode of operation Detect 1 LED The red Detect 1 LED is used to display the status of Channel 1 There are several different statuses that can be displayed on this LED Off No vehicle present in the detection area and the loop is functioning normally ...

Page 13: ...ill flash on one two or three times depending upon the prior failure type When the detector is in the low power mode Green LED flashes on once every 2 seconds the channel Detect LED will flash on at the same time Detect 2 LED The red Detect 2 LED is used to display the status of Channel 2 There are several different statuses that can be displayed on this LED Off No vehicle present in the detection...

Page 14: ... Change Fault When the detector senses that a loop is experiencing a large inductance change greater than 25 the LED will flash three times every two seconds repeatedly for the duration of the fault If the fault is corrected the LED will display the appropriate Prior Fault indication Prior Fault The detector is equipped with the ability to remember prior faults that have occurred since the last po...

Page 15: ...ed to reduce the loop wire bend angle to not exceed 45 degrees at any location 5 Use backer rod to hold the loop wire at the bottom of the saw cut before sealing the loop The backer rod should be cut into 1 inch pieces and one placed every foot or so as needed 6 If a loop installation will cross an expansion joint in the roadway surface some method of leaving some slack wire at the joint should be...

Page 16: ...f the source is overhead or below ground power lines the saw cut should be parallel to the short side of the loop The loop wire is placed in the saw cuts using a figure 8 motion A figure 8 loop will have more inductance that a similar sized conventional loop 14 If multiple loops are to be connected to the same detector there are several things to be aware of a Always connect multiple loops in seri...

Page 17: ...ring the loop should have a jacket of cross linked polyethylene or similar material that has very low moisture absorption properties This would be a wire with an XLP jacket such as XHHW THHN or similar wire types should never be used for loop wire The gauge of the wire to use depends on two factors Distance in cable feet from the loop to the detector and stresses the wire may see The gauge of the ...

Page 18: ... water finds its way in to these air pockets over time freeze thaw cycles can slowly jack the loop out of the saw slot causing loop failure The saw slot should be deep enough that the loop wire will have a minimum of of sealant over the top wire in the slot More is better Going too deep with the saw cut is also a concern Deep cuts in a road surface may impact the structural strength of the roadway...

Page 19: ...DSP 22 2 User Manual Page 19 of 25 DSP 22 2_MAN_A Figure 3 Loop Installation Figure 4 Saw Cut for Home Run Exit and Chiseled Corner for Home Run Exit BACKER ROD LOOP WIRE SAW DETAIL A DETAIL B ...

Page 20: ...at it fits snugly in the saw slot Use a blunt object not a screwdriver to press the backer rod pieces down into the saw slot as far as they will go Keeping the loop wire at the bottom of the saw slot allows the loop sealant to provide the maximum amount of protection possible from foreign object penetration Never use a continuous piece of backer rod over the loop as this would prevent the loop sea...

Page 21: ..._MAN_A Side Detection Zone Placement NOTE When the roadway is greater than 11 feet wide requiring a greater detection zone you have the option to add a second Mini Loop Probe to the opposing side of the roadway The probes must be wired in series ...

Page 22: ...s below 5 ohms the loop inductance should be checked This is done using an inductance meter The inductance of the loop should be less than 1500 microhenries It is very unusual to have a loop with an inductance value this high but it is possible with very large loops and many turns If the loop inductance value is above 1500 microhenries the loop will have to be replaced with a loop with less induct...

Page 23: ...ts used in the loop circuit remove them and replace with a crimp connection or preferably a soldered connection The open loop fault could also be a fatigued point in the loop wire This can occur at locations where the loop wires cross an expansion joint in the road surface Any place where the loop wires must move even if only a very tiny amount can cause wire fatigue The actual failure point may b...

Page 24: ...s proximity to the loop and the amount of energy being used If you believe the loop is experiencing electrical interference turn off the device believed to be the source of the interference and see if the problem goes away Sometimes this is not possible and more technical means are needed to help identify the source Call Technical Support in this case If the electrical interference is occurring in...

Page 25: ...igh is the correct setting However to compensate for some unusual loop geometries this setting may be inadequate Adjust the sensitivity one level higher and recheck the detector for proper detection If the channel sensitivity is set to high and the red LED still does not come on and you have another operating detector swap the loops between a working detector and a failing detector If the problem ...

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