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Technical Support: +44(0)23 9269 6638 (option 3)
PAK200583_02C Jan 2021 ©2019 ELMDENE INTERNATIONAL LTD
27.6 Vdc 1 Amp Switch Mode Power Supply for Fire
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EN54-4:1997 +A1 +A2
STX2401-C
STX2401-T
F
EATURES
The STX2401-x is an EN54-4:1997 +A1 +A2 approved power supply ideal for use in Fire & Smoke and
ventilation control Systems. Its regulated 27.6V dc output will supply up to 1.2 Amps continuous
current into the load, in addition to providing up to 300mA for charging the standby battery capacities
of 1.2Ah (STX2401-T) or 7Ah (STX2401-C). The power supply output features electronic short circuit
protection under both mains and standby battery operation. Maximum battery life is assured through
continuous active battery monitoring and the use of a two stage charger, comprising bulk and
temperature compensated final float phase depending upon battery condition. Once fully charged the
product operates in Eco power saving mode, whereby the batteries are charged for 4 hours in every
24 hour period while still being continuously monitored. This reduces wasted energy in charging
already fully charged batteries and extends their working life. Deep discharge protection prevents
premature battery failure when operating from standby for extended periods. Two sets of volt free
solid state relay fault output signal (i) loss of mains and (ii) battery fault, charger fault and loss of
output. In addition there is an optional plug in serial interface that can provide diagnostic and fault
reporting information to supervisory systems.
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Certified by UL to EN54-4:1997 +A1 +A2.
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Up to 1.2A current to load at 27.6V dc nominal regulated output.
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Charging capability to support 1.2 or 7Ah batteries.
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Electronic overload protection shuts down output until overload or short circuit is removed.
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Battery Monitor detects battery missing, low battery, short-circuit or reverse connection or circuit
impedance (Ri) in excess of 500m
, caused by connector or wiring problem/corrosion, within 4 hours.
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Battery charging circuit is energised only when a battery is correctly connected and the battery voltage
is greater than 14 V.
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No loss of output during automatic connection of battery to load on loss of mains.
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Deep discharge protection disconnects battery from load when battery voltage falls below 21 V.
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Diagnostic indicator LED (Orange) (Internal).
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Fault indicator LED (Yellow) flashes on detection of output fault, battery fault, charger fault and mains
failure.
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Mains indicator LED (Green) showing mains present Indicators check at start-up.
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Optional RS232 serial interface for fault reporting and diagnostics.
Elmdene International Ltd
Tel: +44(0)23 9269 6638
3 Keel Close, Interchange Park,
Fax: +44(0)23 9266 0483
Portsmouth, Hampshire, PO3 5QD, UK
0843-CPR-0213 14 (UL)
2531-CPR-CSP11212 20 (DBI)
