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Global Solutions Personal Focus
The No-Break™ DC power supply is designed to provide DC power and float charge lead acid batteries for
critical back up applications. The SR250i
to all the normal features of the No-Break™ DC range, the SR250i
face to enable user monitoring of the power supply and user control of the battery condition test function.
No-Break™ SYSTEM BLOCK DIAGRAM
AC MAINS
RS485
STANDBY
LED
LED &
comms. port
OFF
BUTTON
POWER
LED
OK LED
ON
BATTERY
LED
SYSTEM
ON
OK LED
MAINS FAIL /
ALARM
POWER SUPPLY
OFF
FAIL ALARM
BATTERY
ALARM
SYSTEM
OFF
FAIL ALARM
OPERATION OF ELECTRONIC CIRCUIT BREAKER (ECB) UNDER OVERLOAD CONDITIONS
System Current Limit
(AC mains on)
Battery is discharging whenever load cur-
rent exceeds 1x (system current limit).
Short circuit condition
can only exist for 2mS
6x
2.5x
1x
2mS
ECB operates after 2mS under short circuit condition and after 300mS of sustained overload.
Specifications are subject to change without notice. No liability accepted for errors or omissions.
485 is a variant of our standard SR250C
POWER CONVERSION
OUTPUT VOLTAGE, CURRENT
LIMIT & BATTERY CHARGE
CURRENT CONTROL
BATTERY
MANAGEMENT
BATTERY
& ALARM
CURRENT
CIRCUIT
SENSE
6x overload
for 300mS max.
Total current
PSU + Battery
PSU current
Component
Time
300mS
485 has a serial communication inter-
ELECTRONIC
REVERSE
CIRCUIT
POLARITY
BREAKER
FUSE
NORMAL OPERATION
LOAD CURRENT < PSU MAX CURRENT
System Current Limit
(during AC fail)
Short circuit condition
can only exist for 2mS
6x
1.5x
2mS
At all times the ECB allows 50-60% system overload.
model.
In addition
I
LOAD
LOAD +
LOAD -
I
CHARGE
BATTERY +
BATTERY TEMP.
SENSOR
BATTERY -
6x overload
for 300mS max.
Indefinite
Until LVD
300mS
Time
3
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