Reno A & E GT - 200 User Manual
Model GT - 200
Two Channel Rack Mount Detector with Timing
• Meets and exceeds NEMA TS 2 specication.
• Call Delay selectable in one-second increments up to 63 seconds.
• Call Extension selectable in 1/4-second increments up to 15.75
seconds.
• Eight front panel DIP switches for each channel provide:
• Eight levels of sensitivity.
• Presence or Pulse mode.
• Four loop frequencies.
• Fail-Safe or Fail-Secure operation.
• Channel disable.
®
Ordering Information:
Model GT-200-XX
R = Relay outputs
SS = Solid State outputs
• Loops are sequentially scanned to eliminate crosstalk.
• Channel status outputs provide individual channel status states
per NEMA TS 2.
• Loop Fail Event Monitor remembers and indicates intermittent
and current loop failures.
• Detector is self tuning and provides complete environmental
tracking.
• Dual color, high intensity LEDs:
• Green indicates detect.
• Red indicates loop fail.
• Audible detect signal (buzzer) facilitates loop and/or detector
troubleshooting.
• Complete built-in detector integrity test.
The Model GT-200 series is designed to meet or exceed NEMA Standards TS 2-1998 for Type C detectors and
is downward compatible to NEMA Standards TS 1-1989. Model GT-200 detectors are two channel, card rack
type loop detectors with delay and extension timing. Delay and extension timing condition the channel Call
outputs in either Presence or Pulse mode.
3510 E. ATLANTA AVENUE, PHOENIX AZ 85040 +1.480.968.6407 EDITRAFFIC.COM
Model GT - 200 Specications
This is a Performance Specication. It is not intended to be used as Operating Instructions.
Loop Frequency: Each channel has four (4) DIP switch selectable loop frequencies (normally in the range of 20 to
100 kilohertz) that are a function of the actual loop / lead-in network.
Sensitivity: Eight (8) sensitivity levels are available for each channel. The eight settings are selectable using three
DIP switches. Each of the eight sensitivity levels are binary encoded from 0 to 7 (lowest to highest sensitivity). The
sensitivity level selected determines the percentage of negative inductance change of the loop circuit required for
a CALL output signal. See SENSITIVITY, -∆L/L, & RESPONSE TIME table.
Channel Disable: When set to the Disable position, the channel output is continuously in the no call state regardless
of the presence or absence of vehicles over the loop. The loop oscillator is not activated when the channel is in the
Disabled (ON) state. Changing this setting will RESET the channel.
Presence / Pulse Mode: Each channel can be independently set to operate in one of two modes by means of front
panel mounted DIP switches.
Presence Mode: Call hold time is a minimum of four minutes regardless of vehicle size, and is typically one
to three hours for an automobile or truck.
Pulse Mode: A pulse of 125 ±10 milliseconds duration is generated for each vehicle entering the loop
detection zone. Each vehicle detected is instantly tuned out if it remains in the loop detection zone longer
than two seconds. This feature allows detection of vehicles subsequently entering the detection zone. After
each vehicle leaves the loop detection zone, the channel resumes full detection sensitivity within one second.
Changing the Presence / Pulse Mode switch will RESET the channel.
Fail-Safe / Fail-Secure Operation: During a loop failure condition, the state of the channel’s output can be
selected as CALL in the Fail-Safe mode or NO CALL in the Fail-Secure mode. Fail-Safe operation during a loop failure
is the standard mode of operation for intersection control. Fail-Secure operation during a loop failure is typically
used for incident detection systems for freeway management. Fail-Secure selection also selects fast response for
very accurate speed measurements. See SENSITIVITY, -∆L/L, & RESPONSE TIME table. Changing this setting will
RESET the channel.
Call Delay: Each channel’s Call Delay is adjustable from 0 to 63 seconds in one-second steps by means of PCB
mounted DIP switches. Call Delay time starts counting down when a vehicle rst enters the loop detection zone.
If the Delay feature is activated, the output will only be turned on after the selected delay time has passed with a
vehicle continuously present in the loop detection area. If a vehicle leaves the loop detection area during the delay
interval, detection is aborted and the next vehicle to enter the loop detection area will initiate a new full delay
interval. Whenever a channel’s Phase Green Input (call delay override) signal (pins 1 or 2) is active (low state), the
Call Delay function for that channel is aborted and the Call delay time is forced to zero. The detector indicates that a
vehicle is being detected but that the outputs are being delayed by ashing the channel’s Detect / Fail LED (green)
at four Hz with a 50% duty cycle.
Call Extension: Each channel’s Call Extension is adjustable from 0 to 15.75 seconds in 1/4-second steps. Call
Extension time starts counting down when the last vehicle leaves the loop detection zone. In the event a vehicle
enters the loop detection zone before the extension time expires, the detector will return to the detect state
(regardless of the setting of the delay timer) and the extension timer will be reset. When the last vehicle leaves the
loop detection zone, full Extension time is reestablished and the detector begins counting down again. The detector
will indicate that the extension interval is currently timing by ashing the channel’s Detect / Fail LED (green) at 16
Hz with a 50% duty cycle.
Audible Detect Signal: A front panel mounted push button is used to enable an audible detect signal that is emitted
any time a given channel’s detection zone is occupied.
Detect / Fail Indicator: Each channel has a super bright, high intensity, dual color (Red / Green) LED that indicates
a Call output and/or the status of any current or prior loop fault condition. A continuous On (green) state indicates
a CALL output. A continuous On (red) state indicates that a current open loop failure condition or an inductance
change condition of greater than +25% condition exists. A one Hz (red) ash rate indicates that a current shorted
loop failure condition or an inductance change condition of greater than -25% condition exists. A ash rate of three
50 millisecond (red) pulses indicates a prior loop failure condition. A ash rate of three 50 millisecond (red) pulses
followed by a 750 millisecond (green) pulse indicates a prior loop failure condition and a current CALL output (detect
state). If the audible detect signal is activated, any detect indication that would normally be displayed as green will
be displayed as orange.
Loop Fail (Event) Monitor: If the total inductance of the loop input network goes out of the range specied for
the detector, or rapidly changes by more than ±25%, the affected channel will immediately enter the programmed
Fail-Safe or Fail-Secure mode of operation. Fail-Safe operation generates a continuous Call output in the Presence
or Pulse mode. Fail-secure operation does not generate a call during a loop failure. In both modes of operation, the
FAIL LED will illuminate and remain on for as long as the loop fault exists. If the loop self-heals, the channel will
resume operation in a normal manner, but the FAIL LED of the channel will begin to ash at a rate of three ashes
per second as a means of indicating a prior Loop Fail condition. The FAIL LED will continue its indication of a prior
loop failure until the detector channel is reset or the detector is manually reset.
Loop Inductance Range: 20 to 2000 microhenries with a Q factor of 5 or greater.
Loop Feeder Length: Up to 5000 feet (1500m) maximum with proper feeder cable and appropriate loops.
Loop Input: Transformer isolated. The minimum capacitance added by the detector is 0.068 microfarad.
Scanning: The loop(s) connected to each detector channel are activated alternately to minimize crosstalk between
adjacent loops connected to the same detector.
Lightning Protection: The detector can tolerate, without damage, a 10 microfarad capacitor charged to 2,000 volts
being discharged directly into the loop input terminals, or a 10 microfarad capacitor charged to 2,000 volts being
discharged between either loop terminal and earth (chassis) ground.
Detector Reset: Changing the position of either channel’s DIP switches (except the Frequency switches or Call
Delay / Call Extension switches) will reset that detector channel. The detector can be reset by connecting a logic
ground signal to Pin C (Reset Pin). Reapplication of power after a power loss will also cause the detector to reset.
After changing either channel’s Frequency selection switches (DIP switches 2 & 3), the channel will require a reset.
Phase Green Inputs: Meets and/or exceeds all NEMA TS 1 and TS 2 requirements. Application of a Low state
voltage (0 to 8 VDC) to pin 1 (Ch. 1) and/or pin 2 (Ch. 2) causes the delay timer for the channel to abort the delay
timing function.
Solid State Outputs: Optically isolated. 30 VDC max. collector (drain) to emitter (source). 100 mA max. saturation
current. 2 VDC max. transistor saturation voltage. The output is protected with a 33-volt Zener diode connected
between the collector (drain) and emitter (source).
Relay Outputs (Optional): The relay contacts are rated for 6 Amps max., 150 VDC max., and 180 Watts max.
switched power.
Response Time: The response time of either channel is affected by the sensitivity level setting and Fail-Safe / FailSecure selection of that channel. When set to operate in Fail-Safe mode, response time is 65 ±25 milliseconds for
all sensitivity levels. When set to operate in Fail-Secure mode, response time varies and depends on the sensitivity
level selected. See SENSITIVITY, -∆L/L, & RESPONSE TIME table.
Self Tuning: The detector automatically self tunes and is operational within two seconds after application
of power or after being reset. Full sensitivity and hold time requires 30 seconds of operation.
Environmental & Tracking: The detector is fully self-compensating for environmental changes and loop
drift over the full temperature range and the entire loop inductance range.
Grounded Loop Operation: The loop isolation transformer allows operation with poor quality loops
(which may include one short to ground at a single point).
Detect Outputs: Per NEMA TS 2, a detection output (CALL) is indicated by a closed relay contact (Relay
output) or a conducting state (Solid State output). When operating in Fail-Safe mode, a channel’s output
defaults to a CALL state for any loop failure condition on that channel. When operating in Fail-Secure
mode, a channel’s output defaults to a NO CALL state for any loop failure condition on that channel.
In either Fail-Safe or Fail-secure mode, a channel’s output defaults to a CALL state upon loss of power.
NEMA TS 2 Channel Status Outputs: Meets and/or exceeds all NEMA TS 2 status output specications.
Test Mode: A PCB mounted DIP switch enables Test Mode. Test Mode provides a means of verifying
proper operation of the detector’s controls and indicators (switches and LEDs). Each channel’s loop
oscillator circuit is also checked to verify the correct frequency in each of the four frequency settings. The
frequency portion of testing requires that each channel be connected to a 100 microhenry loop; if other
inductance values are used, the frequency test results will be invalid.
Weight: 6.0 oz (170 gm).
Size: 4.50 inches (11.43 cm) .high x 1.12 inches (2.84 cm) wide x 6.875 inches (17.46 cm) deep (including
connector, excluding handle). Handle adds 1.00 inch (2.54 cm) to depth measurement.
Operating Temperature: -40º F to +180º F (-40º C to +82º C).
Circuit Board: Printed circuit boards are 0.062 inch thick FR4 material with 2 oz. copper on both sides
and plated through holes. Circuit boards and components are conformal coated with polyurethane.
Connector: 2 x 22 contact edge card connector with 0.156 inch (0.396 cm) contact centers. Key slots
located between pins B/2 & C/3, E/5 & F/6, and M/11 & N/12. See PIN ASSIGNMENTS table.
Power: 10.8 to 30 VDC. Solid State output, 100 mA max.; Relay output, 130 mA max.
Sensitivity -∆L/L
0 1.28% 65 ±25 milliseconds 3.5 ±2.5 milliseconds
1 0.64% 65 ±25 milliseconds 3.5 ±2.5 milliseconds
2 0.32% 65 ±25 milliseconds 3.5 ±2.5 milliseconds
3 0.16% 65 ±25 milliseconds 3.5 ±2.5 milliseconds
4 0.08% 65 ±25 milliseconds 4.5 ±3.5 milliseconds
5 0.04% 65 ±25 milliseconds 7.0 ±6.0 milliseconds
6 0.02% 65 ±25 milliseconds 11.5 ±10.5 milliseconds
7 0.01% 65 ±25 milliseconds 21.5 ±20.5 milliseconds
Switch ON OFF Factory Default
1 Channel Disabled Channel Enabled OFF
2
3 OFF
4 Fail-Safe Mode Fail-Secure Mode ON
5 Presence Pulse ON
6
7 ON
8 ON
PIN Function PIN Function
A DC (-) Common 1 No Connection
B DC (+) Power 2 No Connection
C Reset Input 3 No Connection
D Channel 1 Loop Input 4 Channel 1 Loop Input
E Channel 1 Loop Input 5 Channel 1 Loop Input
F Channel 1 Output, Drain 6 No Connection
H Channel 1 Output, Source 7 Channel 1 TS 2 Status Output
J Channel 2 Loop Input 8 Channel 2 Loop Input
K Channel 2 Loop Input 9 Channel 2 Loop Input
L Chassis Ground 10 No Connection
M No Connection 11 No Connection
N No Connection 12 No Connection
P No Connection 13 No Connection
C No Connection 14 No Connection
S No Connection 15 No Connection
T No Connection 16 No Connection
U No Connection 17 No Connection
V No Connection 18 No Connection
W Channel 2 Output, Drain 19 No Connection
X Channel 2 Output, Source 20 Channel 2 TS 2 Status Output
Y No Connection 21 No Connection
Z No Connection 22 No Connection
Sensitivity, -∆L/L, & Response Time
Fail-Safe Fail-Secure
Factory Default Settings
Four (4) Frequency Selections
Eight (8) Sensitivity Selections
PIN Assignments
Response Time
OFF
OFF
Model GT - 200 (551-0704-00) 03/23/2020
© COPYRIGHT 2020. Eberle Design, Inc. All Rights Reserved.
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