Rae H2 User manual

SINGLE CHANNEL LOOP DETECTOR
OPERATING INSTRUCTIONS
I General
The Model H2 is a single channel detector with a solid state Detect Output and a
solid state Fail Output. Please verify source voltage before applying power.
The Model H2 will operate on voltages between 8 and 30 VDC with a maximum
current requirement of 45 mA.
II Indicators and Controls
i Power / Detect / Fail LEDs
The detector has one green and two red LED indicators used to provide
indications of the detector’s power status, output state, and/or loop failure
conditions. The table below lists the various indications and their meanings.
Status
POWER LED (Green)
DETECT LED (Red)
FAIL LED (Red)
Off
No power
Detect Output Off
Loop OK
On
Power to detector
Detect Output On
N/A
Flash N/A
2 Hz (50% duty cycle)
Delay timing
4 Hz (50% duty cycle)
Extension timing
1 Hz (50% duty cycle)
Loop Failure
One flash every five seconds
Prior Loop Failure
ii Rotary Switch (Sensitivity)
The eight-position rotary switch selects one of eight (8) sensitivity levels as
shown in the table below. 0 is lowest and 7 is highest, with normal (factory
default) being 4. Use the lowest sensitivity setting that consistently detects the
smallest vehicles. Using higher than necessary sensitivity levels may result in
false detections.
Position
0
1
2
3
4 *
5
6
7
-∆L/L
2.56%
1.28%
0.64%
0.32%
0.16% *
0.08%
0.04%
0.02%
* Factory default setting.
MODEL H2

2
iii DIP Switches
Switch
OFF
ON
Factory Default
1
Frequency
(See table in Frequency section)
OFF
2
ON
3
Fail-Safe
Fail-Secure
OFF
4
No Boost
Sensitivity Boost
OFF
5
Detect Output Delay
(See table in Output Delay section)
OFF
6
OFF
7
Detect Output Extension
(See table in Output Extension section)
OFF
8
OFF
Frequency (DIP Switches 1 and 2)
When loops are located in close proximity to one another it may be necessary to
select different frequencies for each loop to avoid loop interference, commonly
known as crosstalk. DIP switches 1 and 2 can be used to configure the detector
to operate at one of four frequencies corresponding to Low, Normal, Medium,
and High as shown in the table below.
Switch
Frequency
Low (0)
Normal (1) *
Medium (2)
High (3)
1
ON
OFF *
ON
OFF
2
ON
ON *
OFF
OFF
* Factory default setting.
Fail-Safe / Fail-Secure (DIP Switch 3)
When DIP switch 3 is in the OFF position, the detector operates in Fail-Safe
mode.If a loop fault occurs when operating in Fail-Safe mode the Detect
Output is “ON”.
When DIP switch 3 is in the ON position, the detector operates in Fail-Secure
mode.If a loop fault occurs when operating in Fail-Secure mode the Detect
Output is “OFF”.
NOTES: Changing the setting of this DIP switch will reset the detector.
The factory default setting is OFF, Fail-Safe mode.
Sensitivity Boost (DIP Switch 4)
Sensitivity Boost is activated using DIP switch 4. When a vehicle is detected
sensitivity is automatically "boosted" to a higher level. The higher sensitivity
level remains until detection is dropped, at which time the sensitivity returns to
the no-detect level. This feature provides protection against dropping detection
when high bed vehicles pass over the loop.
NOTE: The factory default setting is OFF, no Sensitivity Boost.

3
Detect Output Delay (DIP Switches 5 and 6)
An Output Delay time of zero, two, five, or ten seconds can be programmed
using DIP switches 5 and 6. Output Delay time is the time before the Detect
Output activates following vehicle detection. If the Output Delay feature is
programmed to a value other than zero the Detect Output is "ON" only if a
vehicle is continuously detected for the programmed delay time. If vehicle
detection is lost during the delay time period the delay timer is reset to zero.
The next vehicle entering the loop detection zone starts a new delay time period.
The Detect LED flashes at a two Hertz rate (50% duty cycle) during the delay
time period.
Switch
Detect Output Delay Interval
Zero (0)
Seconds *
Two (2)
Seconds
Five (5)
Seconds
Ten (10)
Seconds
5
OFF *
ON
OFF
ON
6
OFF *
OFF
ON
ON
* Factory default setting.
Detect Output Extension (DIP Switches 7 and 8)
An Output Extension time of zero, two, five, or ten seconds can be programmed
using DIP switch positions 7 and 8. Output Extension time is the time following
the loss of detection before the Detect Output is dropped. If another vehicle
enters the loop during the extension time period the extension timer is reset to
zero, and a full extension time period follows the departure of the last detected
vehicle. The Detect LED flashes at a four Hertz rate (50% duty cycle) during
the extension time period.
Switch
Detect Output Extension Interval
Zero (0)
Seconds *
Two (2)
Seconds
Five (5)
Seconds
Ten (10)
Seconds
7
OFF *
ON
OFF
ON
8
OFF *
OFF
ON
ON
* Factory default setting.
III Detector Reset
The following actions perform Detector Reset:
1. Remove and reapply power.
2. Changing Fail-Safe / Fail-Secure setting. (DIP switch 3).
3. Momentarily connecting Pin 3 of the Molex connector to ground (0 to 2
VDC).
Detector Reset must be performed following any change in loop-operating
frequency. Changes in Sensitivity, Sensitivity Boost, Delay time, or Extension
time immediately take effect without the need to perform Detector Reset.

Model H2 Operating Instructions P/N 889-0805-00
4
IV Failed Loop Diagnostics
The Fail LED (red) provides loop failure information. The Fail LED is "OFF"
when the loop inductance value is within tolerance, and no past out of tolerance
conditions have existed. The Fail LED flashes at a one Hertz rate (50% duty
cycle) when the current loop inductance value is out of tolerance. The Fail LED
flashes at a rate of one flash every five seconds when a past out of tolerance loop
condition has existed, but the current loop inductance value is within tolerance.
This flash rate continues as long as the loop inductance value remains in
tolerance. Resetting the detector clears the fail indication. A flashing Fail
LED indication suggests the possibility of an intermittent loop connection.
Reno A&E highly recommends soldering all loop connections with a proper
soldering iron and rosin core solder.
V Pin Connections
Pin
Function
1
Loop
2
Loop
3
Reset
4
No Connection
5
No Connection
6
Fail Output Drain
7
Fail Output Drain
8
Detect Output Drain
9
DC +
10
DC Common
NOTES: Pins 6 and 7 (Fail Outputs) are in a conducting state when power is applied and
a functioning loop is connected to the detector. If power or the loop fails, the
Fail Output will open to provide an indication of the failure.
The Detect and Fail Outputs are FET devices that sink current to DC Common
(i.e. the FET Output switches the load to DC Common). To operate properly,
the output must be connected as shown below:
If the output is being used to turn on an inductive device such as a relay, a
snubber diode should be wired in parallel with the relay coil.
DC Common
Detector
+ VDC
Load
Detect or Fail Output
Optional Diode