Specifications are subject to change without notice. No liability accepted for errors or omissions.
3
The
No-Break ™DC
power supply is designed to provide DC power to lead acid batteries for critical back up
applications. In addition to the normal features of the standard
SR750C..
model, the
SR750
i
….-LAN+
has
an ethernet communication interface using SNMP protocol to enable user monitoring of the power supply and
battery parameters and control of the battery condition test function.
No-Break
™ SYSTEM BLOCK DIAGRAM
LOAD +
I
LOAD
AC MAINS
STANDBY
LED &
BUTTON
POWER
OK LED
BATTERY
SYSTEM
OK LED
MAINS FAIL /
POWER SUPPLY
FAIL ALARM
BATTERY
SYSTEM
FAIL ALARM
LED
ON
LED
ON
LED
OFF
ALARM
OFF
ALARM
OFF
LOAD -
B
BATTERY -
NORMAL OPERATION
LOAD CURRENT < PSU MAX CURRENT
ELECTRONIC
CIRCUIT
BREAKER
POWER CONVERSION
BATTERY
MANAGEMENT
& ALARM
CIRCUIT
BATTERY
CURRENT
SENSE
OUTPUT VOLTAGE, CURRENT
LIMIT & BATTERY CHARGE
CURRENT CONTROL
I
CHARGE
BATTERY TEMP.
SENSOR
REVERSE
POLARITY
FUSE
The ECB is activated under the following conditions: 1.
battery voltage drops below the Vdisco (1.66V/cell)
2.
battery current overload (refer to graphs above)
The ECB will latch open only when there is no input power present. It will reset when input power is restored or can be manually
reset by briefly shorting the
BAT-
and
LOAD-
terminals together when there is no input power.
Input power on
OPERATION OF ELECTRONIC CIRCUIT BREAKER (ECB)
Input power off
Trip time
ms
2
300
System load current
(x I PSU rated)
2.5
6
ECB does not trip below 2.5x I PSU rated
Battery supplies max of 1.5 x IPSU rated
Trip time
ms
2
300
System load current
(x I PSU rated)
1.5
5
ECB does not trip below 1.5x I PSU rated
INTRODUCTION
Ethernet port
