DC Backup UPS
Application, Maintenance and Installation Manual
Revision 1
The main components of the 700x series are shown in the following block diagram.
AC in
Figure 4
7021 and 7025
series Block diagram
5
Monitoring
Analog monitoring
The status of the unit is indicated on the front panel, and remotely, via voltage-free contacts. The following
table shows the details.
CONDITION
LOCAL (LEDs)
REMOTE (RELAYs)
Charger OK
Green light if OK
N/O contact closes if OK
DC available
Green light if V
load
over 18VDC
-
Low Voltage alarm
Red light if V
batt
is under 20VDC
N/O contact opens on low battery
18/10/06
7021 and 7025_manual1.doc
Page 5 of 7
Linear DC
power
supply
Lead acid
battery
(fused)
Monitoring and
control unit
Changeover switch
and low voltage
disconnect circuit
User load
connection
Telemetry
