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Technical Support: +31(0)20 613 1611
PAK200581_01N October 2015 ©2015 SenseTek B.V.
27.6 Vdc 5 Amp Switch Mode Power Supply for Fire – EN54-4:1997 +A1 +A2
V02205 - STX2405-E
V02105 - STX2405-C
F
EATURES
The STX2405-x is an EN54-4:1997 +A1 +A2 approved power supply ideal for use in Fire and Smoke and
ventilation control Systems. Its regulated 27.6V dc output will supply up to 5 Amps continuous into
the load, in addition to providing up to 850mA for charging the standby batteries up to 17Ah. 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.
Certified by UL to EN54-4:1997 +A1 +A2.
Up to 5A current to load at 27.6V dc nominal regulated output.
Charging capability to support 7 or 17/18Ah batteries.
Electronic overload protection shuts down output until overload or short circuit is removed.
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 corrosion within 4hours.
Battery charging circuit is energised only when a battery is correctly connected and the battery voltage
is greater than 14 V.
No loss of output during automatic connection of battery to load on loss of mains.
Deep discharge protection disconnects battery from load when battery voltage falls below 21 V.
Diagnostic indicator LED (Orange) (Internal).
Fault indicator LED (Yellow) flashes on detection of output fault, battery fault, charger fault and mains
failure.
Mains indicator LED (Green) showing mains present Indicators check at start-up.
Optional RS232 serial interface for fault reporting and diagnostics.
SenseTek B.V.
Tel: +31(0)20 613 1611
Abberdaan 162, 1046 AB, Amsterdam
Fax: +31(0)20 613 2212
The Netherlands
0843-CPR-0215
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