Product Data Sheet

Power Supplies
Battery backed up power supplies enable a system to continue functioning properly in the case of failure of the primary mains power source. UK Health & Safety law requires all fire alarm control equipment to have battery backed power supplies. Tann`s range of boxed 24-28v DC power supply units are designed to be universal power sources for fire systems and ancilliary equipment, and can be used as direct replacements for older Tann charger/power supplies. They can be used whenever a 24 volt "uninterruptable" power supply is required, and are avaliable in a choice of power ratings and cabinet sizes to suit the powered equipment and required standby times.

Key Features · High efficiency switched mode type · Twin (primary and secondary) outputs · Fully monitored mains and battery supplies · Automated periodic battery capacity check · Front panel status check indicators · Fault relay for remote signalling to equipment · Temperature compensated charger for improved battery life · Chassis avaliable seperately for retrofits · Load shedding prevents battery damage · Cabinets can accomodate a range of batteries · High stability, cool running

Capacity Formula
In order to meet British Standard guidelines, the correct capacity of battery needs to be chosen. This is achieved using the following formula:


Where:
Cmin is the minimum capacity of the batteries when new, at 10 hour discharge rate and 15°c.
T is the required standby period in hours according to BS5839.
Ia is the standby load in amps of the system/equipment.
Ib is the full load in amps of the alarm devices (sounders, bells, strobes).
Ic is the panel alarm load in amps with 25% of zones in a fire condition, or a minimum of 2 zones plus any other equipment (relays, etc) that is activated by an alarm condition.

Specifications

Type	PSI	PSV	PSX
Input voltage	220-240v AC 50Hz	110-240v AC 50-60Hz	110-240v AC 50-60Hz
Output voltage	18.5-28v at 20°c (no load)	18-33v at 20°c (no load)	18-33v at 20°c (no load)
Output Current	1A maxi	5.5A maxi	11A maxi
Cabinet Size (standard)	320 x 345 x 85mm	380 x 380 x 100mm	495 x 495 x 220
Weight (no batteries)	3kg	TBA	TBA
Operating Temperature	-5 to +45°c	-5 to +50°c	-5 to +50°c
Maxi Humidity	95% RH (non condensing)	95% RH (non condensing)	95% RH (non condensing)
Battery Capacity	2x 12v 7Ah maxi	Std 2x 12v 17Ah maxi Large 2x 12v 24Ah maxi	Std 2x 12v 36Ah maxi Up to 2x 12v 64Ah with extra cabinet
Fault output	SPCO contact, 1A 30v DC maxi	DPCO contact & open-collector signal	DPCO contact & open-collector signal
Front Panel Indicators	Power & Fault	AC On, DC On, Fault	AC On, DC On, Fault

All units designed to comply with BSEN54-4, EN60950 and UL1950. Onboard LED indicators give further details of fault conditions. Deep discharge protection cuts off output if battery voltage drops below 19v

Order Codes

PSI	24 volt 1 amp boxed power supply unit
PSIC	24 volt 12 amp power supply chassis only
PSV	24 volt 5 amp boxed power supply unit, standard case (380x380x100)
PSVE	24 volt 5 amp boxed power supply unit, large case (495x495x220)
PSVC	24 volt 5 amp power supply chassis only
PSX	24 volt 10 amp boxed power supply unit
PSE	Empty large battery cabinet for 10 amp unit
PSXC	24 volt 10 amp power supply chassis only

Back to Batts, PSUs, Spares & Repairs

Product Price List