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Information Manual
Underground Loops and Loop Detectors
Underground Loops and Loop Detectors
DoorKing Plug-In Loop Detectors and Loop Accessories
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Copyright 2016 DoorKing, Inc. All rights reserved.
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Table of Contents
Related Manuals for DoorKing 9411 Single Channel with Aux Relay
Summary of Contents for DoorKing 9411 Single Channel with Aux Relay
- Page 1 Information Manual Underground Loops and Loop Detectors Underground Loops and Loop Detectors DoorKing Plug-In Loop Detectors and Loop Accessories Copyright 2016 DoorKing, Inc. All rights reserved.
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Page 3: Table Of Contents
DoorKing Preformed Loop Guidelines SECTION 3 - TYPICAL LOOP LAYOUT EXAMPLES Slide Gates Swing Gates SECTION 4 - TROUBLESHOOTING LOOP SYSTEMS Loop Diagnostics Poor Connections Shorted Loop Wire Detector Adjustments SECTION 5 - DOORKING LOOP DETECTORS AND ACCESSORIES Loop Info-Q-2-16... -
Page 4: Introduction
The lead-in cable: If additional lead-in wire is required, DoorKing recommends that you use a shielded twisted pair (Insulated (floated) at one end and grounded at gate opera- tor) with a direct burial rated jacket or be placed in PVC conduit. - Page 5 Pre-formed loops are typically encased in PVC or other durable materials to provide high reliability and long life. Sizes may vary depending on the source of the pre-formed loop. DoorKing offers a variety of pre-formed loops that come with 25 feet of lead-in wire.
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Page 6: Section 1 - How The Loop System Works
SECTION 1 - HOW THE LOOP SYSTEM WORKS Field of Sensitivity A loop sets up an inductive field, called a field of sensitivity. This field of sensitivity completely surrounds the loop wires extending above, below, and on all sides of the loop. When a vehicle (or any metallic object) enters this field of sensitivity, the inductance of the loop changes as more of the inductive field is disrupted by the vehicle. -
Page 7: Field Cancellation Effect
Field Cancellation Effect Winding the loops in the same direction (Clockwise or Counter-Clockwise) electrically creates the effect of the electrical current passing through the closest edges of the loops in opposite directions. Since the electrical currents are flowing in the opposite directions, the inductive fields of sensitivity created have the same magnetic poles (North or South) toward each other. -
Page 8: Loop Phasing
Loop Phasing It was mentioned previously that when two loops are wired to the same detector terminal, they must be the same size, same number of turns and the same distance from the gate. They must be connected in series and the direction in which each loop is wound is important for proper door or gate operation. -
Page 9: Loop Detection Field Interference And Loop Placement
Loop Detection Field Interference and Loop Placement Detection Field Around Loops It is important that the loops are installed far enough away from all moving metal objects (gate) to keep the loop’s detection fields clear. The 1/2 to 2/3 the length of the short leg of the loop will determine a detection field limit. -
Page 10: Section 2 - Loop Installation Guidelines
SECTION 2 - LOOP INSTALLATION GUIDELINES In order to have a loop detection system operate as a reliable, high performance system, it is necessary to pay careful attention to the loop installation. The use of proper installation techniques and the proper type of wire can reduce frustration, aggravation, and unnecessary service calls. - Page 11 Cutaway of Underground Loops Roadway Sealant even with road surface. Sealant even with road surface. Sealant Sealant 1/2” to 3/4” Min. 1” depth 1 1/2” Backer Rod Typical 2” 1” Foam backer rod Typical spaced every 1 ft in saw cut Depth will vary holds wires in place.
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Page 12: Doorking Preformed Loop Guidelines
• The same careful attention to proper installation guidelines described for saw cut loops also apply to the installation of DoorKing 4 ft x 8 ft preformed loops. • Preformed loops should be imbedded 2 to 3 inches below the surface of the poured concrete pavement. -
Page 13: Section 3 - Typical Loop Layout Examples
Slide Gates Every slide loop installation is unique and may have specific problems that are not fully explained in this manual. DoorKing highly recommends that the loop system is installed by a professional installer who understands loop systems and can foresee any problems that might occur for your specific installation. -
Page 14: Swing Gates
Shadow Loop • Minimum loop size is 18 in. x 48 in. (Pages 3 and 4) DoorKing preformed loops are 4 ft x 8 ft. (Page 10) • Minimum loop size is 18 in. x 48 in. (Pages 3 and 4) DoorKing preformed loops are 4 ft x 8 ft. -
Page 15: Section 4 - Troubleshooting Loop Systems
(rain, sprinklers, morning dew, etc.), the nick causes a short to ground. This can be checked by utilizing a megohm meter capable of testing up to 500 megohms (500 million ohms), such as a DoorKing meter P/N 9401-045 (A typical ohms meter will 1000 ABOVE 1000 not read units as small as micro henries). -
Page 16: Section 5 - Doorking Loop Detectors And Accessories
Loop’s detection field. Used with the 1600 barrier gate operators. Manufactured by DoorKing Inc. Megohm meter. Checks integrity of ground loops. Reads up to 500 megohms. - Page 17 Information Manual Underground Loops and Loop Detectors Underground Loops and Loop Detectors DoorKing Plug-In Loop Detectors and Loop Accessories DoorKing, Inc. 120 S. Glasgow Avenue Inglewood, California 90301 U.S.A. Phone: 310-645-0023 Fax: 310-641-1586 Loop Info-P-3-10 www.doorking.com...