Reno GT-200-LRT User manual

(Firmware Version GT 2.x)
TWO CHANNEL LOOP DETECTOR
WITH DELAY AND EXTENSION TIMING
OPERATING INSTRUCTIONS
GENERAL
The Model GT-200-LRT is a two channel, scanning card rack type loop detector.This detector provides
reliable train detection for Light Rail Train detection applications by incorporating special features that prevent
lock-ups caused by high electric currents found in electrified railroads when loops are placed between the rails.
The detector automatically tunes and is operational within two seconds after application of power or a reset.
Full sensitivity and hold time require approximately 30 seconds of operation. The detector is fully self-
compensating for environmental changes and loop drift over the full temperature range. Each channel is
programmed using a front panel eight-position DIP switch. Call Delay and Call Extension timing functions are
programmed using PC board mounted DIP switches. Each channel has one dual color (green/red) LED
indicator. The LED provides an indication of the output state and loop failure conditions. Normal output
conditions are indicated when the LED is illuminated in green or orange. Loop failure conditions are indicated
when the LED is illuminated in red. A built-in test mode provides means for verifying proper operation of the
DIP switches, loop oscillator circuitry, and LED indicators.
CONTROLS AND INDICATORS
Front Panel Switches
Two eight-position DIP switches are labeled 1, for channel 1 and 2, for channel 2.
Channel Disable
When the DISABLE switch is in the disable position, the channel’s output is continuously in the No Call state
regardless of the presence or absence of vehicles over the loop. The loop oscillator is off when the channel is in
the disabled state.
NOTE: Changing the Channel Disable DIP switch resets the detector channel.
Loop Frequency
Each channel has four (4) selectable loop frequencies.
MODEL GT-200-LRT
Factory Default Settings Shown
SENSE
LEVEL
4
2
1
PULS PRES
1
2
FREQ
DISABLE
(
)
FAST NORM
1
7
6
5
4
3
2
8 Sensitivity Levels: 0to 7(See Sensitivity Level Section)
4 Frequency Selections: 0to 3(See Loop Frequency Section)
Pulse / Presence
Fast / Normal Response
Disable / Operate
1
2
FREQ
1
8
7
6
5
4
3
2
High (0)
1
2
1
8
7
6
5
4
3
2
Medium High (1)
1
2
1
8
7
6
5
4
3
2
Medium Low (2)
1
2
1
8
7
6
5
4
3
2
Low (3)

2
Fast/Normal Response Mode
DIP switch 4 is used to select the detector’s response time.
Normal Mode is recommended. Use Fast Response for speed and occupancy applications.
NOTE: Changing the Fast/Normal Response Mode DIP switch setting resets the detector channel.
Pulse/Presence Mode
DIP switch 5 controls the output mode of each channel.
PRESENCE (PRES): Presence Mode provides a Call hold time of at least four minutes (regardless of vehicle
size) and typically one to three hours.
PULSE (PULS): Pulse Mode generates a single 125 millisecond pulse output for each vehicle entering the
loop detection zone. Any vehicle remaining in the loop detection zone longer than two seconds will be tuned
out providing full sensitivity for any vacant portion of the loop detection zone. Full sensitivity for the entire
loop detection zone is recovered within one second following the departure of vehicles.
NOTE: Changing the Presence/Pulse DIP switch setting resets the detector channel.
Sensitivity Level
Each detector channel has eight (8) sensitivity selections.
NOTE: Changing the Sensitivity Level setting resets the detector.
Audible Detect Feature (Buzzer)
A front panel pushbutton switch labeled BUZZER is used to enable the audible detect feature. Either channel
can have this feature activated. When this feature is active the channel LED illuminates with an orange color.
The first time the pushbutton is pressed a 50 millisecond audible signal confirms the activation of Channel 1.
The second time the pushbutton is pressed two 50 millisecond audible signals confirm the activation of Channel
2. To deactivate this feature press and hold the pushbutton for one second. A 250 millisecond audible signal
confirms the deactivation of the feature. This feature automatically turns off 15 minutes following activation.
NOTES: 1) When operating in Pulse mode the buzzer will cease if a vehicle occupies the detection zone for
more than two seconds.
2) The buzzer is activated whenever a vehicle is detected in the loop. This allows the technician
to directly verify loop function without being concerned with Delay and/or Extension timing
functions.
PC Board Mounted Programming DIP Switches
The two-position DIP switch labeled S3 is used to activate the “Test Mode” and the “100 Millisecond
Minimum Output Mode”.
Test Mode
When S3 switch 1 is turned ON, the Test Mode is activated. For more information on Test Mode, refer to the
Model GT-200-LRT Operation Manual.
NOTE: The Test Mode DIP switch must be OFF for normal detector operation.
“5” (0.04 % -∆L/L)
1
8
7
6
5
4
3
2
4
2
1
“0” (1.28 % -∆L/L)
1
8
7
6
5
4
3
2
4
2
1
“1” (0.64 % -∆L/L)
1
8
7
6
5
4
3
2
4
2
1
“2” (0.32 % -∆L/L)
1
8
7
6
5
4
3
2
4
2
1
“3” (0.16 % -∆L/L)
1
8
7
6
5
4
3
2
4
2
1
“4” (0.08 % -∆L/L)
1
8
7
6
5
4
3
2
4
2
1
“6” (0.02 % -∆L/L)
1
8
7
6
5
4
3
2
4
2
1
“7” (0.01 % -∆L/L)
1
8
7
6
5
4
3
2
SENSE
LEVEL
4
2
1

3
100 Millisecond Minimum Output Mode
When operating in Presence Mode two modes of operation are available for the Call outputs. Either “Normal
Mode” or “100 Millisecond Minimum Output Mode”, which is selected by S3 switch 2.In “Normal Mode” the
Call outputs are active without a minimum Call output time. In the “100 Millisecond Minimum Output Mode”
each Call output duration will be a minimum of 100 milliseconds.
Call Delay and Call Extension
The four, six-position DIP switches labeled S1, S2, S4, and S5 located on the PC Board are used to program
Call Delay and/or Call Extension. DIP switch S1 controls Channel 1 Delay Timing, DIP switch S2 controls
Channel 1 Extension Timing, DIP switch S4 controls Channel 2 Delay Timing, and DIP switch S5 controls
Channel 2 Extension Timing. To turn any of these DIP switches ON, push the switch up.
Call Delay (S1 and S4)
Each DIP switch has six (6) switches labeled 1second, 2seconds, 4seconds, 8seconds, 16 seconds, and 32
seconds. The programmed delay time is the total value of all switches turned ON.
Call Extension (S2 and S5)
Each DIP switch has six (6) switches labeled 1/4 second, 1/2 second, 1second, 2seconds, 4seconds, and 8
seconds. The programmed extension time is the total value of all switches turned ON.
Reset
Changing the position of any individual channel’s front panel DIP switches (except the Frequency switches)
resets the channel.
The detector can be reset by connecting a logic ground to Pin C or by the interruption of power.
Pin Assignments
Pin
Function
Pin
Function
A
DC Common
1
No Connection
B
DC +
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, Collector
6
No Connection
H
Channel 1 Output, Emitter
7
No Connection
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
R
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, Collector
19
No Connection
X
Channel 2 Output, Emitter
20
No Connection
Y
No Connection
21
No Connection
Z
No Connection
22
No Connection
63 Seconds
2
4
8
32
1
16
1
2
3
4
5
6
ON
36 Seconds
2
4
8
32
1
16
1
2
3
4
5
6
ON
32 Seconds
2
4
8
32
1
16
1
2
3
4
5
6
ON
0 Seconds
2
4
8
32
1
16
1
2
3
4
5
6
ON
Channel 1 - S1
Channel 2
- S4
0 Seconds
4
¼
½
1
2
8
1
2
3
4
5
6
ON
Channel 1 - S2
Channel 2 - S5
8 Seconds
4
¼
½
1
2
8
1
2
3
4
5
ON
9 Seconds
4
¼
½
1
2
8
1
2
3
4
5
6
ON
15.75 Seconds
4
¼
½
1
2
8
1
2
3
4
5
6
ON

Model GT-200-LRT GT 2.x Operating Instructions P/N 889-0711-01
4
Detect/Fail Indicators
Each channel includes one dual color (green/red) light emitting diode (LED). The LED displays three colors;
green, red, and orange.
NOTE: If either channel has the audible detect feature activated, that channel’s Detect/Fail LED will be
illuminated in an orange state for any Call output condition.
Detect / Fail LED
Output Status
OFF No Call Output
GREEN - Solid Call Output
ORANGE - Solid Call Output
Audible Detect Feature Activated
GREEN - Four flashes per second No Call Output
Vehicle Detected
Delay Timing active
ORANGE - Four flashes per second
No Call Output
Vehicle Detected
Delay Timing active
Audible Detect Feature Activated
GREEN - 16 flashes per second Call Output Detection zone vacant
Extension Timing active
RED – Solid ON Open Loop Failure
RED - One Hz flash rate (50% Duty Cycle) Shorted Loop Failure
RED - Three 50 ms flashes per second Prior Loop Failure - Current Loop OK
RED - Three 50 ms flashes per second followed by a
GREEN- 750 ms flash Call Output Prior Loop Failure - Current Loop OK
RED - Three 50 ms flashes per second followed by an
ORANGE - 750 ms flash
Call Output
Prior Loop Failure - Current Loop OK
Audible Detect Feature Activated
RED - Three 50 ms flashes per second followed by
GREEN - four flashes per second
No Call Output
Vehicle Detected
Delay Timing active
Prior Loop Failure - Current Loop OK
RED - Three 50 ms flashes per second followed by
ORANGE - four flashes per second
No Call Output
Vehicle Detected
Delay Timing Active
Prior Loop Failure - Current Loop OK
Audible Detect Feature Activated
RED - Three 50 ms flashes per second followed by
GREEN - 16 flashes per second
Call Output
Detection zone vacant
Extension Timing active
Prior Loop Failure - Current Loop OK