Diablo DSP-19 Manuale utente

Diablo Controls, Inc.

Document: DSP19_MAN_A

Released: June 05, 2017

Pros Who Know Trust Diablo

User Manual

DSP-19

Loop and Mini-Loop Vehicle

Detector

DSP-19 User Manual Page 2 of 24 DSP19_MAN_A

1. Contents

Figures ....................................................................................................................................................................3

2. Introduction ...........................................................................................................................................4

Functional Data.......................................................................................................................................................5

Electrical Data.........................................................................................................................................................6

Environmental Data................................................................................................................................................6

Mechanical Data.....................................................................................................................................................7

3. Features and Functions...........................................................................................................................8

Solid-State Output ..................................................................................................................................................8

Detector Reset........................................................................................................................................................8

Presence Detection.................................................................................................................................................9

Pulse Detection.......................................................................................................................................................9

Sensitivity (Rotary Switch)......................................................................................................................................9

Frequency (DIP Switches 1 and 2) ........................................................................................................................10

Loop / Magnetometer (DIP Switch 3)...................................................................................................................10

Normal / Extended Presence (DIP Switch 4) ........................................................................................................10

Normal Sensitivity / Sensitivity Boost (DIP Switch 5) ...........................................................................................11

Fail-Safe / Fail-Secure (DIP Switch 6)....................................................................................................................11

Output Connector.................................................................................................................................................12

Indicators..............................................................................................................................................................12

4. Installation...........................................................................................................................................15

Detector Installation.............................................................................................................................................15

Loop Installation...................................................................................................................................................15

Mini-Loop Installation...........................................................................................................................................18

5. Configuration .......................................................................................................................................20

Wiring ...................................................................................................................................................................20

6. Troubleshooting ...................................................................................................................................21

No Power LED .......................................................................................................................................................21

Power LED Flashes Slowly (2Hz) ...........................................................................................................................21

Power LED Displaying 1 Flash On, Every Two Seconds.........................................................................................21

Power LED Displaying 2 Flashes On, Every Two Seconds .....................................................................................21

Power LED Displaying 3 Flashes On, Every Two Seconds .....................................................................................22

Power LED Flashes Off Every Two Seconds ..........................................................................................................23

Detect LED Intermittently Comes On / Stays On Without a Vehicle Present.......................................................23

Detect LED Will Not Come On With a Vehicle Present.........................................................................................24

DSP-19 User Manual Page 3 of 24 DSP19_MAN_A

Figures

Figure 1: Product Views..............................................................................................................................................4

Figure 2: Physical Dimensions ....................................................................................................................................7

Figure 3: Outputs..................................................................................................................................................... 11

Figure 4: Power LED States...................................................................................................................................... 13

Figure 5: Detect LED States ..................................................................................................................................... 14

Figure 6: Loop Installation....................................................................................................................................... 17

Figure 7: Saw Cut for Home Run Exit and Chiseled Corner for Home Run Exit....................................................... 17

Figure 8: Typical Mini-Loop Installation .................................................................................................................. 18

Figure 9: Mini-Loop Side Installation....................................................................................................................... 19

DSP-19 User Manual Page 4 of 24 DSP19_MAN_A

2. Introduction

The DSP-19 is a compact vehicle detector that will operate on any voltage from 8 to 35 volts DC. The low voltage

range is ideal for solar applications. The DSP-19 can be connected to a standard inductive loop or one of Diablo

Controls mini-loops. The Diablo Controls mini-loop is a small “pipe shaped” device approximately 4-1/2” by 1” and

is designed to be buried in the ground to detect vehicles. Contact Diablo Controls for more information on the

mini-loop. The DSP-19 can be used as either a safety loop or free exit loop detector. It also has the flexibility to be

either “fail-safe” or “fail-secure”. The DSP-19 has a single solid-state FET output.

The DSP-19 has 10 selectable sensitivity settings and uses a 6-position DIP switch to configure the detector. This

includes the Diablo Controls mini-loop selection as well as sensitivity boost, extended presence and fail- safe/fail

secure operation. This makes the DSP-19 very flexible and versatile for those installations that need a little more

than a standard detector

Figure 1: Product Views

DSP-19 User Manual Page 5 of 24 DSP19_MAN_A

Functional Data

Sensitivity: Ten sensitivities are user selectable.

Setting

Sensitivity

Setting

Sensitivity

.48% ΔL/L

.08% ΔL/L

.32% ΔL/L

.06% ΔL/L

.24% ΔL/L

.04% ΔL/L

.16% ΔL/L

.03% ΔL/L

.12% ΔL/L

.02% ΔL/L

Frequency Settings: There are four frequency settings available. The actual loop frequency is

dependent on loop circuit inductance.

DIP Switch

Frequency

OFF

High

OFF

Medium Low

OFF

Medium High

Low

Inductive Loop Response Time: Response time is dependent on the sensitivity selected.

Setting

Response Time

Setting

Response Time

70ms ±10ms

140ms ±20ms

70ms ±10ms

140ms ±20ms

70ms ±10ms

140ms ±20ms

70ms ±10ms

140ms ±20ms

Mini-Loop Response Time: Response time is dependent on the sensitivity selected.

Setting

Response Time

Setting

Response Time

130ms ±10ms

250ms ±20ms

130ms ±10ms

250ms ±20ms

130ms ±10ms

250ms ±20ms

130ms ±10ms

250ms ±20ms

Vehicle Hold Time: In Normal Presence Mode: Approximately 1 hour for a detection of 1% ΔL/L.

In Extended Presence Mode: Approximately 1 to 2 days for a detection of 1% ΔL/L.

DSP-19 User Manual Page 6 of 24 DSP19_MAN_A

Electrical Data

Loop Inductance: 20 microhenries to 1500 microhenries (including lead-in inductance). Not all

frequency settings are available at inductances below 30 microhenries.

Operating Voltages: One wide range power version:

8 volts to 35 volts DC

Solid State Output Rating: Maximum Output Current: 250 milliamps

Maximum Pull-Up Voltage: 30 volts

Maximum Voltage Drop Across Active Output: 0.3 volts

Current Draw: Without detection is 31 ma maximum

With detection is 40 ma maximum

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-19 User Manual Page 7 of 24 DSP19_MAN_A

Mechanical Data

Mounting Position: Any

Housing Material: Lexan

Housing Size: 2.362 inches (High) x 2.008 inches (Wide) x .866 inches (Deep)

60.00 mm (High) x 51.00 mm (Wide) x 22.00 mm (Deep)

Figure 2: Physical Dimensions

DSP-19 User Manual Page 8 of 24 DSP19_MAN_A

3. Features and Functions

Solid-State Output

The DSP-19 has one solid-state (open-drain) output. Solid-state outputs have several advantages over relay

outputs:

•Allows for a smaller form factor

•Lower power consumption

•Outputs do not have to be debounced (relay contact bounce when closing)

•Higher reliability due to no moving parts

But they also have their limitations:

•Requires that the detector and the operator have the same DC common

•Requires a pull-up resistor to function correctly

•The output can only be pulled down to DC common (can only sink current)

•Limited current switching capability (250 milliamps)

•Polarity sensitive (will not work if connected backwards)

With proper engineering these limitations can be easily overcome and the benefits of the solid-state output can

be fully realized. Almost all operators are now designed to share their DC common with external devices and have

built in pull-up resistors on their inputs to facilitate working with solid-state (open-collector) outputs. These inputs

usually require less than 20 milliamps of current sinking capability to be activated.

The polarity issue is handled by the operator if the detector plugs directly in to the operator. If using an adapter

board like the RK-1 or RK-3, the negative side of the output is already connected to DC common. So the output is

simply connected to the desired termination point on the controller and it should all work.

The easiest way to envision the function of a solid-state (open-drain) output is to think of it as a normally open

relay contact with the relay common connected to DC common.

Detector Reset

When any of the DIP switches or the 10-position rotary switch is changed, or power is cycled to the detector, the

detector will perform a reset. The reset event will last for two seconds while the detector initiates any changes

and waits for all systems to stabilize. NOTE: If a vehicle is over the loop during the reset period it will not be

detected.

Both LEDs will turn off for 500 milliseconds at the start of the reset event. After that, the red LED will flash

according to its fail-safe or fail-secure mode of operation. A flash rate that is the same as the power LED indicates

the output is operating as fail-safe. A much faster flash rate indicates that the output is operating in the fail-secure

mode.

When a failure occurs, the output will be active if the detector is in the fail-safe mode. It will be inactive if in fail-

secure.

DSP-19 User Manual Page 9 of 24 DSP19_MAN_A

Presence Detection

Presence detection is only available in the inductive loop mode of operation (DIP switch 3 OFF). If the detector is

in the magnetometer mode of operation only pulse on entry operation is available.

While in the inductive loop mode of operation, the main output will always operate in the presence detection

mode. 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 will begin to slowly retune the detector with the goal of tuning

out the vehicle that stalled or parked on the loop over a relatively long time.

The time it takes to complete the retuning process is dependent on the strength of the detection being induced

by the vehicle. In the Normal Presence mode, it usually takes between 15 minutes and about 4 hours. In the

Extended Presence mode, the retune process may take over 24 hours. When the retuning process is complete,

any loop area that vehicles can still travel over will still detect the vehicle as expected. Once the vehicle leaves,

the detector will fully recover from the retuning process within 1 second.

Pulse Detection

In the magnetometer mode of operation, the main output is always configured for pulse on entry operation. The

pulse generated by the main output will be 250 milliseconds long. It is intended that there will be one output

pulse for each car driving over the loop. However, if a vehicle remains over the detection area for longer than two

seconds, a second pulse will be generated when the vehicle exits the area.

NOTE: The magnetometer mode of operation can not be used if the detector will function as a safety loop as

the mini-loop is not capable of presence detection.

Sensitivity (Rotary Switch)

The detector has ten (10) sensitivity levels. In most situations the sensitivity setting five (5) will work effectively.

For those situations where this setting is not sensitive enough, raise the sensitivity one level at a time until the

desired performance is obtained. For those situations where the detector is overly sensitive, lower the sensitivity

one level at a time until the desired performance is obtained. The factory default is five (5).

Like most inductive loop vehicle detectors, the DSP-19 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”).

For the ten sensitivities, the thresholds are:

Setting

Sensitivity

Setting

Sensitivity

.48% ΔL/L

.08% ΔL/L

Factory Default

.32% ΔL/L

.06% ΔL/L

.24% ΔL/L

.04% ΔL/L

.16% ΔL/L

.03% ΔL/L

.12% ΔL/L

.02% ΔL/L

DSP-19 User Manual Page 10 of 24 DSP19_MAN_A

Frequency (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. To aid in mitigating inductive coupling, each DSP-19 unit comes with two

frequency switches. 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 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 detector to high and the other detector to low will provide the maximum frequency

separation.

DIP Switch

Frequency

OFF

High

Factory Default

OFF

Medium Low

OFF

Medium High

Low

Loop / Magnetometer (DIP Switch 3)

The DSP-19 is capable of operating with either a standard inductive loop in the presence mode or the new mini-

loop (magnetometer) in the pulse on entry mode. In the magnetometer mode of operation the detector will only

hold a detection for 2 seconds. Therefore, if a vehicle stays over the sensor for more than 2 seconds it may

generate additional pulses for the same vehicle. The factory default is the inductive loop mode.

DIP

Switch 8

Loop Type

OFF

Inductive Loop

Factory Default

Mini-Loop

NOTE: The magnetometer mode of operation can not be used if the detector will function as a safety loop as

the mini-loop is not capable of presence detection.

Normal / Extended Presence (DIP Switch 4)

After four minutes of continuous detection, the detector will begin to slowly retune the detector with the goal of

tuning out the vehicle that stalled or parked on the loop over a relatively long time. For those instances where a

longer hold period is desired, extended presence is available.

The time it takes to complete the retuning process is dependent on the strength of the call being induced by the

vehicle. In the Normal Presence mode (DIP switch 4 off) this usually takes between 15 minutes and about 4 hours.

In the Extended Presence mode (DIP switch 4 on) the retuning process may take considerably longer, perhaps

over a day or so.

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