Paxton PROXIMITY compact slimline - Manual (Page 4)

About 4
Power supplies
Paxton supplied
Paxton Access Ltd offer these power supply solutions.
Part number Description
339-424
12Vdc boxed backup power supply 1A
430-166 12Vdc boxed backup power supply 2A
339-425 12V 1.2AH battery for 1A boxed PSU
862-719 12V 7AH battery for 2A boxed PSU
998-260 1A 12V d.c. compact power supply with cable tails
12Vdc boxed backup power supply 1A
Standard 1 Amp 12V dc power supply unit with a 205mm X 230mm X 80mm enclosure. Hinge lid with a
tamper switch. Takes 2 X 1.2AH batteries.
12Vdc boxed backup power supply 2A
Standard 2 Amp 12Vdc power supply unit with a 350mm X 325mm X 80mm enclosure. Hinge lid with a
tamper switch. Takes 2 X 7AH batteries.
1A 12V d.c. compact power supply with cable tails
Suitable for powering PROXIMITY compact readers in simple low security applications. Can drive locks
drawing up to 500mA. This supply is housed in a small sealed plastic enclosure and can be fixed to a wall
using the bracket supplied.
Choosing guide
When choosing a power supply for the PROXIMITY compact system there are several considerations.
Current rating
The rating of the power supply must be suited to the load. The maximum quiescent current of the
PROXIMITY compact slimline reader is 140mA.
The minimum power supply rating is equal to the sum of all loads plus 10% (safety factor).
Battery backup
The time that the PROXIMITY compact system will continue to operate when the mains supply fails is
dependent on the current consumption of the system and the battery backup in the power supplies. The
relationship is shown below
Backup time (hours) = Amp hour of backup batteries (Amp hours)
Current consumption of system (Amps)
Power supplies vary in the features they offer relating to battery backup. A few considerations are:
•
Deep discharge – When a backup battery is drained too much it can reach a state whereby it cannot be
recharged. This is deep discharge. Some power supplies have the ability to prevent this happening.
• Recharge limit – Some power supplies limit the current consumption of a battery whilst it is recharging.
If a power supply does not do this then the system may not be immediately operational when mains
power is resumed, i.e. the power will be consumed by the battery recharge.
• Battery capacity – The size of the enclosure will limit the amount/size of the backup batteries.
Table showing power
supplies available from
Paxton Access Ltd
Relationship between current
consumption and battery backup
time