DC Backup UPS
Application, Maintenance and Installation Manual
Revision 1
6
Installation
Fit this unit in locations where personnel access is restricted. Personnel with access must be trained in
electrical safety and be familiar with procedures for avoiding electrical shock.
Allow room in 19 inch rack for airflow around case.
Wiring
AC input
Unit must be connected to mains earth.
Provide external protection, as
there is no AC fusing inside unit
.
DC output
DC output wiring size should comply with wiring codes.
We recommend 1.5mm up to 17Ah, 2.5mm for 40Ah. (keep wiring short)
Connection of the output is from terminal block, E --.
To install as earthed supply connect or – to earth.
To install as a floating supply, connect two 10k/1/2W resistors external to the
unit(see diagram). Fit one resistor from ground to + terminal and the other from
ground to the – terminal.
Batteries
Units are shipped without batteries. On commissioning, check that the fuse is
removed and connect the batteries as follows:
1/ connect RED wire to +ve terminal of battery 1.
2/ connect BLACK wire to –ve terminal of battery 2.
3/ Fit fuse.
Replacement of batteries follows the same procedure.
Remote
monitoring
Remote wiring should be 0.75mm sq.
Wiring plugs into front of unit. The voltage-free contacts are clearly labelled.
Connections for remote monitoring are given in the table below.
Connector pin
number
Function - Analog version
Relay contacts
6 connector top
Common
charger monitor
5
Closed for charger OK, opens on fail
4
Open for OK, closes on fail
3
Common
battery low
2
Closed for batt OK, opens on low
1
Open for OK, closes when low
Mounting dimensions for the 7021 and 7025 range of DCUPS are given in the attached drawing.
7
Maintenance
There is no routine maintenance required on the 7021 and 7025 series DC backup units. However, it is
recommended that the battery capacity be verified yearly with a non-critical load, to ensure adequate
performance during power outages.
18/10/06
7021 and 7025_manual1.doc
Page 6 of 7
WARNING
:
Take care when inserting batteries, as the batteries contain hazardous energy levels
Do not allow battery terminals to connect in a short circuit.
.
