Viking LOOP RACK User manual

Radio Station
Mag.
Lock
Mag. Lock
Safety ConnectorOpen CommandsGuard StationM
Hold Open
Timer
Stop
Close Open
Radio Station Loop Connector Open Commands Guard Station M
GND Close Stop Open Gnd Fire Gnd Strike Gnd Exit
Gnd Center Gnd
Reopen Gnd UL Gnd +28v Gnd Radio Gnd +28v +28v
Mag.
Lock
F
Mag. Lock
N.C.
COM
N.O.
Hold Open
Timer
Stop CloseOpen
LimitLimit
30sec
60secoff
1sec
Mag.
Lock
Hold Open
Timer
Stop
Close Open
30
60
Off 1
LOOP RACK INSTALLATIONLOOP RACK INSTALLATION
Inside
Outside
Reopen
Center
Exit
Reopen
Center
Exit
Gnd
28V
Twist Wire Outside the
Loop 6 Twists/Foot
Until Its Connection
to the Loop Rack
Inside Safety
Loop
Center
Loop
Outside Safety
Loop
Exit
Loop
Loop Connector
Control Board
Connector
Viking Loop Rack
Reopen CenterExit
OP CN RO
Corporate Headquarters
631 Wald
Irvine, CA 92618
Technical Support 800-908-0884

TECHNICAL SUPPORT 1 800 908 0884
Twist Wire Outside the 
Loop 6 Twists/Foot
Until Its Connection 
to the Loop Rack
1/8" to 1/4" Saw Slot
Provide Additional Saw Cuts
to Eliminate Sharp Corners
Continuously Wind Wire
in Loop Slot for the 
Required Number of Loops
(2 Loops Shown)
Guidelines for Vehicular Loop Detector Installation
1. Prevent sharp corners in the geometry of the loop sensor.
2. Install the appropriate number of turns for your loop geometry based on the loop perimeter. Use
Table C (below) as a guide.
3. Use XLP (cross-linked-polyethylene) type of wire. This wire reduces the effects of moisture and
other environmental events in altering the functionality of the vehicular loop detector.
4. Twist the lead wire at least 6 turns per foot.
5. Use BACKER-ROD to minimize damage to the loop detector wire prior to using the sealant.
6. Place the loop detector wire and adjust the sensitivity of the vehicular loop detector unit in a
way to minimize the effects of the gate over the loop detector wire.
IMPORTANT – Some of the following parameters may affect the proper functionality of the
vehicular loop detector (consult the installation manual and the manufacturer of the
vehicular loop detector).
• Gate size,
• Number of turns in the loop sensor wire;
• Distance from the loop sensor wire to the gate either at the open or close position.
1" Min.
Backer-Rod
Vehicular Loop 
Detector Wire 
(3 Turns Shown)
Sealant
Saw Cut
Table C – Recommended Number of Turns
Perimeter in Feet Number of Turns
10 5
20 4
30-40 3
50-100 2
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LOOP RACK INSTALLATIONLOOP RACK INSTALLATION