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Summary of Contents for Diablo DSP-20
- Page 1 User Manual DSP-20 Dual Channel Vehicle Detector With Directional Logic Pros Who Know Trust Diablo DSP20_MAN_C 11/28/18 Page 1 of 24...
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Page 2: Table Of Contents
A Channel LED Shows Two Quick Flashes Once Every Two Seconds ..............22 A Channel LED Intermittently Comes On / Stays On Without a Vehicle Present ..........22 A Channel LED Will Not Come On With a Vehicle Present ................... 24 DSP-20 User Manual Page 2 of 24 DSP20_MAN_C... -
Page 3: Table Of Figures
Figure 5: Power LED Indications ..........................10 Figure 6: Normal Detect Red LED Indications ......................11 Figure 7: Directional Logic Detect LED Indications ....................12 Figure 8: Loop Installation ............................15 Figure 9: DIP Switches ............................. 17 DSP-20 User Manual Page 3 of 24 DSP20_MAN_C... -
Page 4: Introduction
The small package is powered by a high-performance 8-bit microcontroller that does not skimp on performance. The DSP-20 can operate as two independent channels or in a directional logic mode that allows the detector to activate an output based on the vehicle’s direction of travel. -
Page 5: Technical Data
Solid State Outputs: 50 milliamps @ 30 volts Environmental Data Operating Temperature: -35°F to 165°F (-37°C to 74°C) Storage Temperature: -40°F to 176°F (-40°C to 80°C) Humidity: Up to 95% relative humidity non-condensing DSP-20 User Manual Page 5 of 24 DSP20_MAN_C... -
Page 6: Mechanical Data
Mounting Position: Housing Material: Lexan Housing Size: 2.36 inches (High) x 1.75 inches (Wide) x 4.09 inches (Deep) 59.94 mm (High) x 4.45 mm (Wide) x 10.39 mm (Deep) Figure 2: Physical Dimensions DSP-20 User Manual Page 6 of 24 DSP20_MAN_C... -
Page 7: Features And Functions
The output begins when the second loop detects the vehicle. The output can be pulse or presence for either channel. Figure 4: Presence and Pulse Operation in Directional Logic DSP-20 User Manual Page 7 of 24 DSP20_MAN_C... -
Page 8: Presence Detection
On the free exit loop this will keep the gate open until the situation is fixed. This is useful in applications where it is important to allow traffic flow to continue. A fail-secure detector will never output DSP-20 User Manual Page 8 of 24... -
Page 9: Fail-Safe
1 second, then off for another 500 milliseconds before returning to their normal states. The channel will not output any detections or pulses during this two second reset period. If a prior loop fault is being displayed for the channel, it will be cleared. DSP-20 User Manual Page 9 of 24 DSP20_MAN_C... -
Page 10: Indicators
Indicators The DSP-20 is equipped with three LED indicators: Power (Green), Detect A (Red), and Detect B (Red). Power LED – The green power LED has four possible states: Figure 5: Power LED Indications The voltage applied to the detector is less than the minimum display voltage of approximately 3.5 volts. - Page 11 This display is meant to be easily distinguishable from the normal on display. With this additional display mode, the pulse mode of operation can easily be monitored for correct operation. DSP-20 User Manual Page 11 of 24 DSP20_MAN_C...
- Page 12 In the figure the occupancy display is shown as the gray shaded area. Figure 7: Directional Logic Detect LED Indications DSP-20 User Manual Page 12 of 24 DSP20_MAN_C...
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Page 13: Installation
The first consideration is the inductance in the lead-in length. The standard rule of thumb for calculating the inductance of the lead-in is 0.22 µH per foot. So for example, a 100’ lead-in would have 22 µH of DSP-20 User Manual Page 13 of 24... - Page 14 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, especially if any reinforcement material is cut. Using a smaller gauge of wire will allow for shallower saw cuts. DSP-20 User Manual Page 14 of 24 DSP20_MAN_C...
- Page 15 1 to 2 feet. The backer rod should be sized such that 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 DSP-20 User Manual Page 15 of 24...
- Page 16 Once the loop wire leaves the saw slot it should be twisted at least three times per foot. More is better. The twists should be kept tight to be most effective in reducing the effects of electrical interference. DSP-20 User Manual Page 16 of 24...
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Page 17: Configuration
2. This should be used to eliminate interference from other loops that may be in the same area, but connected to a different detector. Loops connected to the same DSP-20 detector will not interfere with each other by design. -
Page 18: Channel 2 Sensitivity (Switches 6 & 7)
Fail-safe operation is only available when a valid input voltage is applied to the detector. Channels configured for pulse output will always operate in the fail-secure mode. OFF = the fail-safe mode of operation is selected. ON = the fail-secure mode of operation is selected. DSP-20 User Manual Page 18 of 24 DSP20_MAN_C... -
Page 19: Directional Logic (Switch 1)
“NC” designates a relay output with the normally closed contacts available. “SS” designates the solid state output. Diablo Controls offers only one voltage type for the DSP-20, the –LV. The LV will operate between 10 to 30 volts, AC or DC. - Page 20 Channel 2 Emitter Output (-) Earth Ground Channel 1 Emitter Output (-) Channel 1 Open Collector Output (+) Channel 1 Loop Channel 1 Loop Channel 2 Loop Channel 2 Loop Channel 2 Open Collector Output (+) DSP-20 User Manual Page 20 of 24 DSP20_MAN_C...
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Page 21: Troubleshooting
If you do not have a meter capable of measuring resistance and inductance, you can skip to this step. Swap the loops between a working channel and a failing channel. If the problem follows the loop the loop is the problem. If it stays in the same channel, replace the detector. DSP-20 User Manual Page 21 of 24 DSP20_MAN_C... -
Page 22: A Channel Led Flashes Quickly (5 Hz)
A Channel LED Intermittently Comes On / Stays On Without a Vehicle Present This type of symptom is usually caused by one of three issues: physical issues with the loop, electrical interference, moving objects in proximity to the loop. DSP-20 User Manual Page 22 of 24 DSP20_MAN_C... - Page 23 Most manhole covers can be bolted in place. Contact the owner of the manhole to see what can be done to mitigate the cover movement. DSP-20 User Manual Page 23 of 24 DSP20_MAN_C...
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Page 24: A Channel Led Will Not Come On With A Vehicle Present
If the channel sensitivity is set to high and the red LED still does not come on, swap the loops between a working channel and the channel with the issue. If the problem follows the loop, the loop is the problem. If it stays in the same channel, replace the detector. DSP-20 User Manual Page 24 of 24 DSP20_MAN_C...
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