Subscriber Discussion

Exit Loop Questions

JS
John Saunders
•Nov 01, 2018
IPVMU Certified

I have a client with an industrial site, entry/exit rolling gates with an island in between. Card access in, exit loop out. They want to add an exit loop inside the entry gate - to provide a back up exit if the main (intended) exit gate goes out of commission. I intuitively don't like it, in part because they sometimes have delivery vehicles (semis) queued up inside the entry, which would keep the gate open. My questions ...

1. Assuming we could address the queued vehicle issue, is there any other reason to avoid this?

2. Can a loop be remotely activated / deactivated? That is, as long as the main exit is functioning properly, the secondary exit loop is inactive, and we can somehow turn it on when (if) it is ever needed?

3. If #2 is possible, can it be done via the access system, which would be connected to the gate operator?

Thanks!

 

Avatar
Michael Silva
•Nov 01, 2018
Silva Consultants

My two cents:

1. I don't see any real issues with this if the new exit loop is properly placed. This would be no different than if a single gate was used for both entry and exit.

2. Yes. Loop detectors typically have dry-contact outputs. You could enable/disable the detector by simply wiring a relay contact or switch in series with the loop detector output.

3. Yes. The relay contact mentioned above could be provided by an auxiliary output from the access control system. This output could be toggled on or off through a command from the access control system

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U
Undisclosed #1
•Nov 01, 2018
IPVMU Certified
In reply to Michael Silva

My two cents:

Don’t be fooled, John.  

IMHO, a similarly reputable consultant’s analysis of your situation could easily fetch $300, if billed on-the-clock :)

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JS
John Saunders
•Nov 01, 2018
IPVMU Certified
In reply to Undisclosed #1

Agree. I expect to invoice myself substantially.

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Corey Vavra
•Nov 02, 2018
In reply to John Saunders

Opinions are free. Its facts you have to pay for :)

U
Undisclosed #1
•Nov 03, 2018
IPVMU Certified
In reply to Corey Vavra

Opinions are free.

Tell my lawyer.

JS
John Saunders
•Nov 01, 2018
IPVMU Certified
In reply to Michael Silva

Great, I assume they worked that way. Thanks.

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Sean Patton
•Nov 01, 2018

Michael pretty much said it all.

You didn't mention it but I would recommend to add in video coverage of the gate if you don't have it, and would consider License Plate Capture capability for when someone runs into the gate arm when you have the detector disabled and they mindlessly drive through it...

JS
John Saunders
•Nov 01, 2018
IPVMU Certified
In reply to Sean Patton

You're right, I didn't mention it, but we do have it. Thanks.

Avatar
Brian Rhodes
•Nov 01, 2018
IPVMU Certified

From our Vehicle Gate Access Control Guide: 

For many enterprise access platforms, and maybe even gate operators, input logic events can be programmed so that specific inputs can be ignored if they are detected 'out of logical sequence'.

For example, the 'inside safety loop' can be ignored if the 'outside safety loop' is detected first/before the main 'exit loop'.

This type of logic cross-linking can be used if just flat-out turning off the loop is a problem.

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JS
John Saunders
•Nov 01, 2018
IPVMU Certified

Thanks, wasn't aware of the potential to use a logic sequence.I kind of like that.

Avatar
Brian Rhodes
•Nov 02, 2018
IPVMU Certified
In reply to John Saunders

A common default implementation of this is used for 'forced door' event muting.

Many systems will send a forced door, or 'door forced open' alert when a door is opened unless an RTE device is used or credential is scanned/entered before the door position contacts are opened.

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Undisclosed #2
•Nov 01, 2018

If UL is needed: https://industries.ul.com/blog/securing-peace-of-mind-operators-and-access-control

 

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