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Features
Features of the power supplies include:
Features
Description
Deep Discharge
Prevention
Prevents deep-discharge of the standby batteries by disconnecting the load when the standby bat-
tery-voltage drops below 19 +/- 1V DC. A deep-discharge can cause permanent damage to standby
batteries. Preventing this condition allows standby batteries to recharge for continued operation
after extended power outages.
Battery Backup
Provides battery power to the load when the AC input of the power supply falls below the rated
level. The voltage at the load remains within the specified range during these switching-transitions.
Battery Boost
Boosts standby battery voltage to maintain a constant 22 VDC when the voltage drops below the 22
VDC level.
Short-Circuit Protection
Provides a shut down on the load side of the power supply when the load-current exceeds the max-
imum level.
Automatic Retry
Restores output to the load when operating conditions return to nominal levels. This feature
restores voltage levels at the load following conditions such as over-current and AC restore.
Battery Impedance
Provides a warning when the impedance of the battery reaches a level that could prevent proper
system operation.
Battery Supervision
Battery presence and low battery voltage supervision
Earth Fault Detection
Earth Fault Detection
General Trouble Relay
All troubles are reported over the common trouble contacts.
Batteries
Standby Battery Type
Two 12 VDC, valve-regulated lead acid
Standby Battery Charging
Two standby batteries wired in series
Maximum Amp Hour Capacity
60 AH maximum
Charge Current
1.25 A Max
Output Current
4 A Max
Maximum Alarm Current
4 A
Normal Standby Load during AC Fail
XT+ 1 Area Releasing Control Unit: 140mA
XT+ 2 Area Releasing Control Unit: 230mA
XT+ 2 Area Releasing Control Unit w/ Status unit & Ancillary board for each Area: 372 mA
A 12Ah battery can support a full alarm load (4A) for 7 minutes following 24hr standby
with a max standby load of 379mA.
Standby Operating Time
24 Hours
Battery Charge Voltage
27.6 VDC
Recommended battery size is 12 Ah for a typical configuration. Required battery size is mainly dependent on
standby current. To determine the most appropriate battery size, use the battery calculator in LE2.
Overview
VES Fire Detection Systems
XT+ Releasing Control Unit Installation Manual
Version 1.00 | December 2018 | MAN-1252VES
Page 15