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Doc ID: I200448 - 30
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June 2021
27.6V dc Switch Mode Power Supply
PSU241038
F
EATURES
High efficiency cost effective power supply ideal for use in Fire, Access Control and General Security
applications. Featuring a regulated 27.6V dc output supplying continuous full rated current to load
plus additional current for charging 2 x 12V standby batteries. Maximum battery life is assured using
deep discharge protection to prevent premature battery failure when operating in standby mode for
extended periods. Two sets of volt-free contacts are provided to signal (i) loss of mains (ii) battery and
loss of output faults. The universal mains input voltage enables the power supply to be used across a
wide geographical area. The highly efficient switch mode design ensures low operating costs,
generates less heat and with a small physical size increases the room available for additional PCBs or
cables. The modular construction simplifies maintenance.
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Up to 10A current to load at 27.6V dc nominal regulated output.
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Charging capability to support 18, 38 or 65Ah batteries with intelligent load enhancement.
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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
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Battery charging circuit is energised only when a battery is correctly connected and the battery
Voltage is greater than 14V.
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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 to 21V.
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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.
