Datasheet

PRELIMINARY
UB20.241
U–Series
24V, 20A, DC-UPS
ZM12.SIDE Side mounting bracket
This bracket is used to mount the DC-UPS sideways with or without utilizing a DIN-Rail.
The two aluminum brackets and the black plastic slider of the unit have to be detached, so that the steel brackets can
be mounted.
For side DIN-rail mounting, the removed aluminum brackets and the black plastic slider need to be mounted on the
steel bracket.
Fig. 26-7
ZM12.SIDE Side mounting bracket
Fig. 26-8
Side mounting with DIN-rail brackets
27. APPLICATION NOTES
27.1. BATTERY REPLACEMENT INTERVALS
Batteries have a limited life time. They degrade slowly beginning from the production and need to be replaced
periodically. The design life figures can be found in the individual datasheets of the batteries and usually is specified
according to the Eurobat guideline or according to the manufacturer’s specifications.
The design life is the estimated life based on laboratory condition, and is quoted at 20°C using the manufacturer’s
recommended float voltage condition. According to the Eurobat guideline, design lives have been structured into the
following different groups:
3 - 5 years:
This group of batteries is very popular in standby applications and in small emergency equipment.
This represents a 4 years design life with a production tolerance of ±1 year.
6 - 9 years:
This group of batteries is usually used when an improved life is required.
This represents a 7.5 years design life with a production tolerance of ±1.5 years.
10 - 12 years:
This group of batteries is used when in applications where longest life and highest safety level are
required. This represents a 11 years design life with a production tolerance of ±1 year.
A battery failure within the specified design life of the battery usually results in a complete loss of the battery
function (broken cell, defect connection, …) and will be detected and reported by the periodical battery tests which
are included in the UB20.241 DC-UPS control unit.
If the operational parameters differ from those which are specified for the design life, an earlier change of the
battery might be necessary. The “real life” is called service life and is defined as the point at which the cell’s actual
capacity has reached 80% of its nominal capacity. At the end of the service life the capacity degrades much faster, so
that a further use of the battery is not recommended.
September 2012 / Rev. 1.3 DS-UB20.241-EN preliminary
All parameters are specified at an input voltage of 24V, 20A output load, 25°C ambient and after a 5 minutes run-in time
unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.
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