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Diablo Controls DSP-222 Operation Manual

Dual channel inductive loop detector sensor unit
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DSP-222 Operations Manual
Dual Channel Inductive
Loop Detector Sensor Unit
This manual contains technical information for the DSP-222 detector sensor unit.
Included are general description, general characteristics, installation procedure,
adjustment instructions, operational guide, maintenance procedures and technical
schematics and drawings.
DSP222H_Manual_A
Page 1 of 17

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Summary of Contents for Diablo Controls DSP-222

  • Page 1 DSP-222 Operations Manual Dual Channel Inductive Loop Detector Sensor Unit This manual contains technical information for the DSP-222 detector sensor unit. Included are general description, general characteristics, installation procedure, adjustment instructions, operational guide, maintenance procedures and technical schematics and drawings.
  • Page 2 The sensor unit occupies one position of a standard 170 input file. Each channel of the DSP-222 will automatically tune to any loop and lead-in inductance between 50 and 750 microhenries with a loop system “Q”...
  • Page 3 4. Theory of Operation The DSP-222 works on the principle that loop frequency is directly related to loop inductance. However, the change in loop frequency is very small -- perhaps as little as one hertz. It is easy to measure a change of one hertz simply by counting the number of cycles in one second.
  • Page 4 5. Detailed Description of Circuit Operation The following description is valid for both channels of the DSP-222. Reference designators are shown for channel 1 with those related to channel 2 in parentheses. Refer to section 8 for block diagram and schematic.
  • Page 5 The front-panel LED indication LED2 (LED1) is used to indicate the “Call” output of the channels. LED3 (LED4) indicates the “Fail” condition of the loops. These outputs are driven directly by the microcontroller. Monolithic voltage regulators provide a stable 12- volt reference supply U3.
  • Page 6 DSP-222 itself is suspect, see section 8 for a complete internal testing sequence. a) Neither channel responds to vehicles. Power supply fault. The DSP-222 requires a 24 VDC nominal supply. The sensor unit will operate at voltages as low as 16 volts. However, supply voltages below this may result in the sensor unit entering a reset state.
  • Page 7 Apply 24 ±1 volt power to the unit. Connect a loop test box with an inductance of approximately 115 microhenries to the loop inputs pins D and E (channel 1) and pins J and K (channel 2) to simulate the connection of loops. NOTE: All of the following signal measurements are referenced to logic ground.
  • Page 8 Possible components at fault are the crystal X1 or microcontroller U1. f) Reset input to microcontroller Voltage at pin 1 of U1 should be 5 volts ± .2 volts. Check to insure pin C on the detector is high--approximately 24 volts. Possible components at fault are transistors Q9, Q10, or diode D5.

  • Page 9: Bill Of Materials

    .1uF 50V PPS 1913 Panasonic/ECH-U1H104JB9 C25,26 .47uf X7R SMD 1206 AVX 12063C474KAT2A C16, 21 220uF 35V elect SMD Elna/RV-35V221MH10-R DSP-222 alum. front panel Diablo P/N CAS013 —– Oscillator plastic cover Modar/JIT minibox —– J1, 2 2 pins .025” sq. x .1” center...
  • Page 10 R4, 13 27K 1/8 watt SMD 1206 generic R6, 15 56K 1/8 watt SMD 1206 generic Q3, 6-8, 10-12 2N3904 NPN SMD SOT-23 transistor Motorola MMBT3904LT1 Q1, 2, 4, 5, 9 2N3906 SMD SOT-23 transistor Motorola MMBT3906LT1 S1, 2 6 position right angle DIP switch Switronic DA06BTS T1, 2 Potcore isolation transformer...
  • Page 11 10. Block Diagram 11. Schematic (next page) DSP222H_Manual_A Page 11 of 17...
  • Page 12 This page left intentionally blank. Remove and insert B-size schematic. DSP222H_Manual_A Page 12 of 17...
  • Page 13 12. Assembly Drawing 13. Specifications Power Supply: 24 VDC ±20%, 80 ma maximum for both channels. Loop Input: The loop inputs incorporate lightning and transient protection devices and the loop oscillator circuitry is transformer isolated. The lightning protection will withstand the discharge of a 10 microfarad capacitor charged to 2,000V across the loop inputs or between any loop input and earth ground.
  • Page 14 Tuning: Each channel of the DSP-222 series will automatically tune to any loop and lead-in combination within the tuning range upon application of power or when a valid reset signal is received. A channel can be reset by adjusting mode, sensitivity, or frequency.
  • Page 15 Front Panel Controls: Front panel mounted DIP switches allow the user to select sensitivity, pulse/presence and frequency on each channel. Operational Modes: Pulse - 125 ms ±25 ms momentary output Presence Time - Meets or exceeds the State of California (Caltrans) Specifications. (Minimum presence = 10 minutes for a change of inductance of 0.06% and minimum presence = 3 minutes for a change of inductance of 0.02%) Note: When operating in the pulse mode, a vehicle remaining over a loop will inhibit...
  • Page 16 Frequency: One of four settings may be selected to eliminate crosstalk. Reset Input: The DSP-222 may be reset by applying a ground true logic level to the reset input pin C for a period exceeding 15 microseconds. Electrical Interconnection: Edge Connector mates with connector types. Cinch 50-44A-30...
  • Page 17 Output Ratings: Optically Isolated Output Versions: the output transistor is rated for a maximum collector voltage of 30 VDC. Maximum collector current is 50 mA. Mechanical: Dimensions 1.12 W x 4.5H x 7.0 (Excluding handle) Environmental: Temperature Range: Storage: -55C to +85C Operating: -37°...