DC UPS battery chargers

Monday, 17 January, 2005 | Supplied by: http://www.mrutty.com.au/

The PB251 is a family of 13.8V and 27.6V 220W/275W off line DC uninterruptible power supplies (DC UPS).

When connected the lead-acid batteries these until provide uninterruptible power to the last in the event of mains failure. 110/120V AC Variants are also available.

Feature of the PB251 Family:

A battery low voltage disconnect switch protects the battery against deep discharge.
A battery charging current controller limits the battery charging current independently pf the load current to extend the battery life.
A self-resetting electronic battery circuit breaker protects against nuisance blowing of the battery fuses on accidental load short circuits.
DC-OK and battery OK alarms including voltage free change over contacts.
Natural convection cooling, no fan bearings to fail or blocked filters.
PB 251 Series have very low output ripple and noise which is similar to linear power converters and is suitable for powering radio equipment.
PB 251 Series is available in chassis mount (CM) and 2RU 19" rack-mounting.
(RML) Variants.
PB 251 output power can be increased by attaching a heat sink to the unit (option-H) or by cooling the unit using the external mounting service via a gear plate (option-P).
PB 256 models with increased output power (PB-256-1210CML and PB-256-2405CML) are available for use where the external mounting surface can act as a heat sink.
PB 251-12B incorporates Hirose connectors suitable for direct connection to radio base station equipment.
Designed to comply with safety standard AS/NZS 60950 and RF Emissions standard AS/NZS CISPR11:2002 Group 1, Class B Limits.