Power Supply Specification
The power supply is capable of supplying a maximum of 3 Amps. This should be
sufficient to power the 2-Door Station pcb, up to 4 readers, 2 locks and provide
charging current for the batteries.
Use the following table to ensure you do not overload the power supply:
Item Current(mA)
DS200 100
Door 1 Entry Reader
80
Door 1 Exit Reader
80
Door 2 Entry Reader
80
Door 2 Exit Reader
80
Door 1 Mag Lock
Door 2 Mag Lock
Battery 1 Recharge current
300
Battery 2 Recharge current
300
Safety Margin
300
Total
The total current should not exceed 3Amps (3000mA). This leaves approximately
1600mA available for supplying the locks on a 2 door system with 2 entry and 2 exit
readers.
Battery Backup
There is room in the cabinet for two 7Ahr batteries giving a total of 14Ahrs. The
length of time these batteries will last depend on the power consumption of the
system. Battery 1 provides backup for the PCB, the readers and Door 1 output.
Battery 2 provides backup for Door 2 output only. Battery 1
must always
be fitted.
A magnetic lock draws current continuously and therefore you can add the continuous
current to the total. A fail-safe lock (door strike) only draws current when it operates.
In this case you need to estimate the average hourly consumption using the following
equation:
Lock Current (mA) x (Number of operations per hour x door relay time)/3600
For example, a 500 mA lock operating 20 times an hour for 5 seconds would use
500 x (20 x 5)/ 3600 = 13.9mA per hour
Once the total power consumption has been determined, then it can be calculated how
long the batteries will last.
Example
DS200 with two readers and 2 magnetic locks, each drawing 400mA would consume
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