Data Sheet

UB20.241
UB-Series
24V, 20A, DC-UPS
2. INTENDED USE
This device is designed for installation in an enclosure. Use an appropriate enclosure which protects against
mechanical, electrical and fire hazards.
This device is intended for professional use in areas such as in industrial control, office, communication, and
instrumentation equipment.
Do not use this device in equipment or systems where malfunction may cause severe personal injury or threaten
human life.
3. INSTALLATION NOTES
This device may only be installed and put into operation by qualified personnel.
The input must be powered from a SELV or PELV power source.
Use DIN-rails according to EN 60715 with a height of 7.5 or 15mm.
Mounting orientation must be output and input terminals on top.
Do not obstruct air flow as the unit is convection cooled. Ventilation grid must be kept free of any obstructions.
Use an appropriately sized 24V power supply, which can deliver the additional required internal current consumption
(including the charging current) specified as input current in the table of chapter 4.
Install the batteries outside the cabinet or in a place, where the batteries will not be heated by adjacent equipment
and ensure sufficient ventilation for the batteries as required in the EN 50272-2 standard.
Use wires not smaller than 4mm
2
(or AWG 12) and not longer than 2x1.5m (equal 1.5m cord length) between the
batteries and the DC-UPS. Longer or thinner wires can change performance of the DC-UPS system.
Use a 35A fuse (ATOF
®
287 035 from Littelfuse or an UL listed fuse with the same characteristics) in the battery path.
The battery fuse protects the wires between the battery and the DC-UPS and shall be located close to the battery. If
PULS battery modules are used, this fuse is already included.
Use a 4A fuse (ATOF
®
287 004 from Littelfuse or an UL listed fuse with same characteristics) between the connection
point of the two 12V batteries and the “Center TAP” connection point of the DC-UPS. An equivalent protection is
included on the PULS battery modules or the PULS UZS24 sensor board. Please note: The center tap connection is not
mandatory but enables an individual charging and monitoring of the two batteries.
Optionally, a PT1000 temperature sensor can be connected to terminals point 11 and 12 to measure the battery
temperature. This adjusts the charging voltage according to the battery temperature which extends the battery life.
This sensor is already installed in the PULS battery modules (UZK24) and the PULS UZS24.100 sensor board.
The following installation clearances must be maintained when the device is loaded permanently with more than 50%
of the rated power:
- Left / right: 5mm (15mm in case the adjacent device is a heat source)
- On top of the unit: 40mm
- On bottom of the unit: 20mm
Agency approvals apply only for altitudes up to 2000m.
Maximum surrounding air temperature: 70°C / 158°F.
A disconnecting means shall be provided for the output and battery input when used in applications according to CSA
C22.2 No 107.1-01.
Feb. 2016 / Rev. 2.1 DS-UB20.241-EN
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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