Page 10 - Security Today, January/February 2020

widely used platforms in access control.
Total system draw: 72.4W
*Calculations based on product specification sheets
Based on this data, you can see that 75W can potentially power an entire 8 door system. If these levels are too close for comfort, there are ways you can save power: use a midspan in- jector or PoE switch that has battery backup. This would elimi- nate the battery backup on the PoE driven power supply and alleviate 10W. You can also limit the PoE driven power supply to 4-6 doors and use 2 power supplies, putting the 12VDC de- vices on one power supply and the 24VDC devices on the other. The cost for the second power supply will certainly be less than using an electrician.
Additionally, the access control manufacturer you are work- ing with may draw less power on the panels. Keep in mind that
“This new standard allows manufac- turers of powered devices to design new products with bigger features, faster motors, and more capabilities.”
this method of powering your access control system will elimi- nate the need to schedule a certified electrician to wire up the power supply. The category cable used for power can run in the same cable trays and paths as other network cabling.
When servicing the system, unplugging the Ethernet cable from the PoE driven power supply is safe with no voltage present. Once the cable is back in, the handshake is performed with the power source and 802.3bt PoE is sent back to power the system.
IEEE802.3bt 4PPoE has made its way into our world of secu- rity and we can take full advantage of its characteristics to save money, labor and make our installations much safer to work with innovative PoE driven power supplies like Tango from Altronix.
Take a look at a recent access control proj- ect you installed, and calculate how much you would have saved using 4PPoE and a PoE- driven Power Supply. You may be surprised at the savings.
Ronnie Pennington is the national sales engi- neer at Altronix Corp.
Powering an 8 Door Access Control System
QTY
Device
Total Current
Voltage
Watts
4
Mercury Boards
2150mA
12VDC
25.8W
8
Card Readers
440mA
12VDC
5.3W
8
Electric Strikes
1200mA
24VDC
28.8W
8
REX Motion
208mA
12VDC
2.5W
1
Battery Charging
833mA
12VDC
10W
LOW VOLTAGE
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