Diablo DSP-20 Manual de usuario

DSP20_MAN_C 11/28/18 Page 1 of 24 Pros Who Know Trust Diablo

User Manual

DSP-20

Dual Channel Vehicle Detector

With Directional Logic

DSP-20 User Manual Page 2 of 24 DSP20_MAN_C

1. Contents

2. Table of Figures ..................................................................................................................................................3

3. Introduction........................................................................................................................................................4

4. Technical Data ....................................................................................................................................................5

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

Electrical Data.........................................................................................................................................................5

Environmental Data................................................................................................................................................5

Mechanical Data.....................................................................................................................................................6

5. Features and Functions ......................................................................................................................................7

Operating Modes....................................................................................................................................................7

Presence Detection.................................................................................................................................................8

Pulse Detection.......................................................................................................................................................8

Sensitivity................................................................................................................................................................8

Sensitivity Boost .....................................................................................................................................................8

Fail-Safe vs Fail-Secure ...........................................................................................................................................8

Fail-Safe ..................................................................................................................................................................9

Fail-Secure ..............................................................................................................................................................9

Detector Reset........................................................................................................................................................9

Channel Reset.........................................................................................................................................................9

Indicators..............................................................................................................................................................10

6. Installation........................................................................................................................................................13

Detector Installation.............................................................................................................................................13

Loop Installation ...................................................................................................................................................13

7. Configuration....................................................................................................................................................17

DIP Switches .........................................................................................................................................................17

Channel 1 Frequency (Switch 12).................................................................................................................... 17

Channel 1 Sensitivity (Switches 10 & 11) ........................................................................................................ 17

Channel 1 Pulse / Presence (Switch 9) ............................................................................................................ 17

Channel 2 Frequency (Switch 8)...................................................................................................................... 17

Channel 2 Sensitivity (Switches 6 & 7) ............................................................................................................ 18

Channel 2 Pulse / Presence (Switch 5) ............................................................................................................ 18

Sensitivity Boost (Switch 4) ............................................................................................................................. 18

Extended Presence (Switch 3) ......................................................................................................................... 18

Fail Type (Switch 2).......................................................................................................................................... 18

Directional Logic (Switch 1) ............................................................................................................................. 19

Wiring ...................................................................................................................................................................19

8. Troubleshooting ...............................................................................................................................................21

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

Flashing Power LED...............................................................................................................................................21

A Channel LED Flashes Slowly (1 Hz) ....................................................................................................................21

A Channel LED Flashes Quickly (5 Hz)...................................................................................................................22

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 3 of 24 DSP20_MAN_C

2. Table of Figures

Figure 1: Front and Rear Views ..................................................................................................................................4

Figure 2: Physical Dimensions ....................................................................................................................................6

Figure 3: Presence and Pulse Operation in Normal Mode .........................................................................................7

Figure 4: Presence and Pulse Operation in Directional Logic.....................................................................................7

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 4 of 24 DSP20_MAN_C

3. Introduction

The DSP-20 is intended to be a general purpose two-channel vehicle detector designed for the parking and access

control industries. 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.

The DSP-20 is a dual-channel detector that uses advanced channel scanning technology to provide superior noise

tolerance. The scanning technology allows for placement of loops closer together (even overlapping) than ever

possible with single channel detectors. The DSP-20 continually monitors the loop circuit looking for conditions

that would signify a fault in the loop circuit and displays the type of fault identified. This quickly helps identify

open or shorted loops. Fault memory alerts the user to past faults that have automatically been recovered.

Diablo Controls’ unique flicker display helps ensure correct operation of a channel when it is operating in the pulse

mode. The channel’s detect LED will turn on while the pulse is being output then display the flicker mode while

the channel is still detecting the vehicle. This allows easy identification of a locked up channel operating in the

pulse mode.

The detector uses an 11-pin relay socket for connections and comes in three possible output versions. The

detector can be supplied with relays using either the normally open (DSP-20-NO) or the normally closed (DSP-20-

NC) contacts. There is also a solid state output version (DSP-20-SS) using an optically isolated open collector

output.

Figure 1: Front and Rear Views

DSP-20 User Manual Page 5 of 24 DSP20_MAN_C

4. Technical Data

Functional Data

Sensitivity: Four sensitivities selectable for presence or pulse modes of operation.

Low 0.50% ΔL/L

Medium Low 0.10% ΔL/L

Medium High 0.05% ΔL/L

High 0.02% ΔL/L

Frequency Settings: There are two settings per channel. The actual loop frequency is dependent on

loop circuit inductance. The detector uses a channel scanning technology to

minimize channel to channel interference.

Pulse Output: 150 millisecond on period followed by a 150 millisecond off period before the

next pulse can begin.

Response Time: 150 milliseconds

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

Extended Presence - Approximately 18 hours for a vehicle detection of 1% ΔL/L.

Electrical Data

Loop Inductance: 20 µH to 1500 µH (including lead-in inductance)

Operating Voltage: Relay Versions: 10.5 volts to 30 volts AC or DC.

Solid State Outputs: 7.5 volts to 30 volts AC or DC.

Operating Current: Relay Versions: Maximum - 120 milliamps (mA) both relays energized.

Typical - 25 mA typical with no relays energized.

Solid State Outputs: Maximum - 60 mA both outputs energized.

Typical - 25 mA typical with no outputs energized.

Output Ratings: Relay Outputs: 3 amps @ 125 volts

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 6 of 24 DSP20_MAN_C

Mechanical Data

Mounting Position: Any

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 7 of 24 DSP20_MAN_C

5. Features and Functions

Operating Modes

There are two selectable operating modes. Both channels of the detector will operate in the same operating

mode. The two operating modes are:

Normal - Two Individual Channels with Pulse or Presence – In this operating mode the detector operates

as two individual detectors. Either channel can operate in the pulse or presence mode. This matches the

operation of a standard detector.

Figure 3: Presence and Pulse Operation in Normal Mode

Directional Logic - Two Paired Channels with Directional Logic – In this operating mode the detector

operates as two logically interconnected detectors for the purpose of determining direction of travel over

two loops. The two loops are in the same travel lane and close enough together that any vehicle to be

detected will be detected by the second loop before being dropped by the first. 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 8 of 24 DSP20_MAN_C

Presence Detection

The channel output will remain activated 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 channel with the goal of tuning out

the vehicle that stalled or parked on the loop. The retuning process takes about an hour to complete with a

vehicle detection of 1% ΔL/L. 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 recover from the retuning

process within 1 second.

This detector does not have a permanent presence or infinite presence detection mode. Instead, it has a feature

called Extended Presence. The hold time length is dependent upon a number of variables, but in general a vehicle

that would normally be held for about one hour will now be held for about 18 hours. This feature is activated for

the entire unit.

Pulse Detection

The pulse mode used is commonly referred to as Pulse On Entry.

If the channel is in the normal mode of operation (Two Individual Channels with Pulse or Presence), the channel

will output a pulse when the vehicle is first detected and will not output again until the loop is no longer occupied.

If the detector is in the directional logic mode of operation (Two Paired Channels with Directional Logic), the first

channel to detect the vehicle will output a pulse when the second loop detects the vehicle while the first channel

is still detecting the vehicle. The detector will not output another pulse until both loops are no longer occupied.

Sensitivity

The detector has four user selectable sensitivity levels for each channel. In most situations the Medium Low or

Medium High setting will work effectively.

Sensitivity Boost

The detector has a user selectable feature that increases the sensitivity of a channel after initial detection. This

feature is active for both channels when selected. This feature is most often used to allow a channel to have a

lower starting sensitivity and then increase it after a vehicle has been detected. This is very useful in situations

where high-bed tractor-trailer vehicles will be passing over the loop. With this feature the detector may be able

to detect the high-bed portion of the vehicle 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.

Fail-Safe vs Fail-Secure

Here’s a little note on fail-safe versus fail-secure operation. In general, a fail-safe detector will output “detect”

when the loop circuit is failed. This is always useful on a safety loop to prevent accidental closure of a gate arm

on a vehicle. 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 9 of 24 DSP20_MAN_C

“detect” when the loop circuit is failed. This will keep the gate closed. This is useful in high-security areas or

installations where containment is needed.

Fail-Safe

When a channel is in the presence mode of operation and a loop failure is detected on that channel, the output

for that channel will stay activated during the failure. In gate applications this feature is used to automatically

open the gate if a loop fails. This feature is active for both channels when selected.

It should be noted that a power failure will always result in a fail-secure operation. 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.

Fail-Secure

When a channel is in the presence mode of operation and a loop failure is detected on that channel, the output

for that channel will stay deactivated during the failure. In gate applications this feature is used to keep the gate

closed if a loop fails. This feature is active for both channels when selected.

It should be noted that a power failure will always result in a fail-secure operation. Channels configured for pulse

output will always operate in the fail-secure mode.

Detector Reset

When the state of any of the DIP switches 1 through 4 are changed, the detector will perform a detector wide

reset which will include resets for both channels. These four switches control functions that modify the operation

of the entire detector. Therefore, to ensure that the changes are implemented correctly from the current

operating mode, all functions of the detector are reset as if the unit had just powered up with the new settings.

All LEDs will turn off for 500 milliseconds at the start of the reset event, then on for 1 second, then off for another

500 milliseconds before returning to their normal states. The detector will not output any detections or pulses

during this two second reset period. If a prior loop fault is being displayed for either channel, it will be cleared.

Channel Reset

When the state of any of the DIP switches 5 through 12 are changed, the detector will perform a channel reset for

the appropriate channel. Channel 1 will be reset with changes to switches 9 through 12. Channel 2 will be reset

with changes to switches 5 through 8. These switches control functions that modify the operation of a channel of

the detector. Therefore, to ensure that the changes are implemented correctly from the channel’s current

operating mode, all functions of the channel are reset as if the unit had just powered up with the new settings.

The appropriate detect LED and the power LED will turn off for 500 milliseconds at the start of the reset event,

then on for 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 10 of 24 DSP20_MAN_C

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

OFF The voltage applied to the detector is less than the minimum display voltage

of approximately 3.5 volts.

LOW VOLTAGE The LED will flash at a once per second rate with 500 milliseconds of on time

and 500 milliseconds of off time. While in this mode, the relay outputs will

not function.

RESET The LED will turn off for 500 milliseconds at the start of the reset event (a DIP

switch change), then on for 1 second, then off for another 500 milliseconds

before returning to the normal state.

NORMAL The LED is always on when the detector is in its normal state of operation.

Detect A – The red Detect A LED is used to display the status of channel 1. There are several different

statuses that can be displayed on this LED:

Open Loop When the detector senses that the loop is open or the inductance is too high,

the LED will turn on for 500 milliseconds then off for 500 milliseconds for the

duration of the fault.

If the fault is corrected, the LED will display the Prior Fault indication.

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