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Output Control for Locks & Lights

Issue:

Output Control for Locks & Lights

Product Line:

NetBotz

Environment:

NetBotz version 2

Cause:

For unlocking doors there are a number of products that can be interfaced to our output relay pod. Depending on the door type, you will be dealing with magnetic locks or electronic door strikes.

Resolution:
 

These devices operate on 12V or 24V power (a separate power supply is required). One of the outputs on our output relay pod would be wired in series with the power to the lock/strike. This way, we control when power is applied to the lock/strike. Typically a magnetic lock is unlocked (released) when power is cut off. Typically a door strike is unlocked (released) when power is applied. If the door is unlocked when power is lost it is referred to as "fail-safe" and if it is locked when power is lost it is referred to as "fail-secure". This is important to consider because when the WB500 loses power, the outputs of the output relay pod will open. The power transformers that are sold with these locks/strikes often have battery back-up -- you would want to have the WB500 on a UPS in that scenario.

Electrically, the specification to look for in these devices is the "power required". Since our output relays are rated at about 10W max, that means that the power required by the lock or door strike needs to be less than 850mA @ 12V (425mA @ 24V). Also, the output relays are rated for a resistive load. Therefore some of the products might require surge suppression, etc. Here is a list of companies found that make magnetic door locks/strikes (please note these are not Schneider entities and the links are not validated on a regular basis):


http://www.securitron.com/
http://www.locknetics.com/
http://www.rutherfordcontrols.com/
http://www.sargentlock.com/products/electro/line_detail.php?line_id=242&
http://www.dortronics.com/


For lighting control, the answer doesn't look to be as simple. What we would look to interface with is called a “low-voltage lighting control system.” It looks these are typically sold as complete systems with wall switches, occupancy sensors, automation controllers, etc. As an example, you can take a look at the GE "Total Lighting Control" pdf:

http://www.geindustrial.com/products/applications/tlc/tlclvrc.pdf.

In these systems there may not always be an easy place for us to be wired in as a control point. Some of the controllers offer options for "dry contact" inputs and the system can be programmed to respond to these inputs. In other systems it may be possible for our output relay pod to be wired into the system in the same way as a manual wall control. In either case, the same electrical ratings apply: 10W max and resistive load.

For basic lighting control needs, the customer can probably find an electrician that can design a simple solution that will do what they want. Since all that may be required is to connect our output relay pod to a power relay that switches the circuit to the light(s) on and off. They need a licensed electrician for doing this type of stuff.


 
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