Datasheet

ManualsBrandsPULS ManualsAccessories for electricalUB20.241

PRELIMINARY

UB20.241

U–Series

24V, 20A, DC-UPS

DC-UPS CONTROL UNIT

■ Allows Batteries Between 3.9Ah and 130Ah

■ Stable and adjustable Output Voltage in Buffer

Mode

■ Superior Battery Management for Longest Battery Life

■ Comprehensive Diagnostic and Monitoring Functions

■ Replace Battery Signal Included

■ Battery Refreshing function

■ Electronically Overload and Short Circuit Protected

■ 3 Year Warranty

1. GENERAL DESCRIPTION

2. SHORT-FORM DATA

Input voltage nom. DC 24V

range 0Vdc- 30Vdc

Output current max. 25A

min. 20A

Normal mode

Buffer mode

Output voltage Adjustable Buffer mode

Allowed batteries 2 x 12V

3.9Ah - 130Ah

VRLA lead acid

Temperature range

Derating

-40 ºC to +70 ºC

0.5A/ ºC

Operational

+60 ºC to +70 ºC

Dimensions 46x124x127mm WxHxD

Buffer time (at 20A)

8’ 5”

15’

7Ah battery module

12Ah battery

module

This uninterruptible power supply (UPS) controller

UB20.241 is an addition to standard 24V power

supplies to bridge power failures of voltage

fluctuations. Expensive downtimes, long restart

cycles and loss of data can be avoided.

The DC-UPS includes a professional battery

management system which charges and monitors

the batteries to achieve the longest battery service

life as well as many diagnostic functions that ensure

a reliable operation of the entire system.

A unique feature of the UB20 Series is the

application of two independent battery chargers.

This makes matching of batteries unnecessary and

allows a precise battery charging, testing and

optimized using of battery capacity.

power

UB10.241

UB20.241

UB-Series

Summary of content (23 pages)

PAGE 1
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series DC-UPS CONTROL UNIT ■ ■ Allows Batteries Between 3.9Ah and 130Ah Stable and adjustable Output Voltage in Buffer Mode Superior Battery Management for Longest Battery Life Comprehensive Diagnostic and Monitoring Functions Replace Battery Signal Included Battery Refreshing function Electronically Overload and Short Circuit Protected 3 Year Warranty ■ ■ ■ ■ ■ ■ 1. GENERAL DESCRIPTION 2.
PAGE 2
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series INDEX 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. PAGE General Description ............................................1 Short-form Data ..................................................1 Order Numbers....................................................1 Markings ..............................................................1 Input ....................................................................3 Output in Normal Mode .................
PAGE 3
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 5. INPUT Input voltage Input voltage ranges nom. nom. DC 24V 23.3 to 30Vdc 30 to 35Vdc 35Vdc Threshold voltage for buffer-mode typ. Identical with buffer voltage Turn-on voltage typ. 23Vdc max typ. 23.3Vdc 70 mA typ. typ. 1.2A 2.4A No limitation Input current 4 External capacitors on the input 1) Continuous operation, see Fig.
PAGE 4
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 7. OUTPUT IN BUFFER MODE If the input voltage falls below the transfer threshold level, the DC-UPS starts buffering without any interruption or voltage dips. Buffering is possible even if the battery is not fully charged. Output voltage in buffer mode Ripple and noise voltage Output current max nom. Short-circuit current typ. 22,5V, 24V, 25V, 26V 120mVpp.
PAGE 5
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series Fig. 7-3 Short-circuit on output, hiccup mode, typical behavior Output Current End of short circuit Start of short circuit 30A t 0 2s 17s 2s 17s 2s 17s 8. BATTERY INPUT The DC-UPS requires VRLA batteries with a sum voltage of 24V which is usually achieved by a series connection of two 12V batteries. To extend the service lifetime of the battery, the point of connection of the batteries can be connected with the center tap of the DC-UPS.
PAGE 6
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 9. BUFFER TIME The buffer time depends on the capacity and performance of the batteries as well as the load current. The diagram below shows typical buffer times of the standard battery modules. Buffer time with battery module UZK24.071 min. 13’ 30” At 10A output current *) min. 4’ 10” At 20A output current *) typ. 16’ 53” At10A output current, see Fig. 9-1 typ. 5’ 12” At 20A output current, see Fig. 9-1 Buffer time with battery module UZK24.121 min.
PAGE 7
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 10. EFFICIENCY AND POWER LOSSES Efficiency Power losses typ. typ. typ. typ. 99%. 3.7W 7,8W 22,7W Normal mode, 20A output current, battery fully charged Normal mode, 20A output current, battery fully charged Buffer mode, 10A output current Buffer mode, 20A output current 11. FUNCTIONAL DIAGRAM Fig.
PAGE 8
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 12. CHECK WIRING AND BATTERY QUALITY TESTS The DC-UPS is equipped with an automatic “Check Wiring” and “Battery Quality” test. “Check Wiring” test: Under normal circumstances, an incorrect or bad connection from the battery to the DC-UPS or a missing (or blown) battery fuse would not be recognized by the UPS when operating in normal mode. Only when back-up is required would the unit not be able to buffer.
PAGE 9
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 14. FRONT SIDE USER ELEMENTS A B Signal Port Plug connector with screw terminals, inserted from the surface. Connections for the Ready, Buffering, Replace Battery relay contacts and for the Inhibit input. See details in chapter 13. Power Port Screw terminals, connection for input and output voltage C Red Error LED Check wiring: Failure in the installation, battery or battery fuse Input voltage: Input voltage is lower than the selected Buffer voltage+0.
PAGE 10
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series Fig. 14-1 Flashing pattern of the red error LED Fig. 14-2 Flashing pattern of the yellow Diagnosis LED 1 Overload 1 0 1 0 1 Chek Wiring 0 1 Input Voltage 0 1 Temp. 0 1 0 Replace Battery Buffertime expired Inhibit active 0 Fig. 14-3 Flashing pattern of the green status LED’s 1 Ready 0 1 Charging 0 1 Refreshing 0 1 Buffering 0 15.
PAGE 11
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 16. RELIABILITY Lifetime expectancy min. min. min. min. MTBF SN 29500, IEC 61709 MTBF MIL HDBK 217F t.b.d. t.b.d. t.b.d. t.b.d. t.b.d. t.b.d. t.b.d. t.b.d.
PAGE 12
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 18. ENVIRONMENT Operational temperature -40°C to +70°C Storage temperature Humidity -40°C to +85°C 5 to 95% r.H. Vibration sinusoidal Shock Over-voltage category Degree of pollution *) 2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g 2 hours / axis 30g 6ms, 20g 11ms 3 bumps / direction, 18 bumps in total III II 2 Reduce output current above 60°C with 0.
PAGE 13
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 21. DIELECTRIC STRENGTH The relay contacts and the inhibit input are floating and separated from the input and output voltage. The following isolation tests were performed. In- / Output Battery + Chassis A Type test 60s A t.b.d. Factory test 5s 500Vac Field test 5s 500Vac Cut off current setting >10mA Type tests and factory tests: Conducted by the manufacturer.
PAGE 14
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series Fig. 24-1 Side view Fig. 24-2 Front view 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. www.pulspower.
PAGE 15
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 25. INSTALLATION NOTES Mounting: The power terminal shall be located on top of the unit. An appropriate electrical and fire end-product enclosure should be considered in the end use application. Cooling: Convection cooled, no forced air cooling required.
PAGE 16
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 26. ACCESSORIES Battery Modules Depending on the requirements of the application two types of pre-assembled battery modules, intelligent or passive, with two different battery sizes are available. The passive battery modules include fuse holders and a temperature sensor. The intelligent modules are equipped with a second temperature sensor, a data interface and allow battery refreshing.
PAGE 17
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series Fig. 26-3 UZK24.072 24V/7Ah intelligent battery module Fig. 26-4 UZK24.122 24V/12Ah intelligent battery module ZM2.WALL Wall / Panel mounting bracket This bracket is used to mount the DC-UPS units onto a flat surface without utilizing a DIN-Rail. Fig. 26-5 Assembled Wall mounting bracket September 2012 / Rev. 1.3 DS-UB20.
PAGE 18
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 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.
PAGE 19
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series Temperature effect: The temperature has the most impact in the service life. The hotter the temperature, the earlier the wear-out phase of the battery begins. The wear-out results in a degradation of battery capacity. See Fig. 27-1 for details. Effect of discharging cycles The number as well as the depth of discharging cycles is limited.
PAGE 20
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series Fig. 27-1 Service life versus ambient temperatures, typ *) Fig. 27-2 Cell capacity degradation vs.
PAGE 21
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 27.3. CONNECTION OF THE CENTER TAP For optimized battery charging and testing the monitoring of every single battery is necessary. This ensures the longest service lifetime of the batteries. Therefore it is recommended to connect the centre point of both batteries with the center tap screw terminal of the UB20-241. (Fig.:26-4) Fig. 27-4 Typical wiring of the center tap Non-buffered circuits Buffered circuits ++ -- + - + IN Output 24V max.
PAGE 22
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series 27.5. CONNECTION OF AN EXTERNAL TEMPERATURE SENSOR The end of charge voltage of VRLA batteries depends on the environmental temperature. This affects the lifetime of the batteries. To avoid overcharging at higher temperatures the end of charge voltage should be adapt to the environmental temperature. For temperature compensated battery charging it is necessary to connect an external temperature sensor (PT1000) to the DC-UPS.
PAGE 23
UB20.241 PRELIMINARY 24V, 20A, DC-UPS U–Series “Error” LED is on Check correct wiring between the battery and the DC-UPS Check battery fuse. Is the battery fuse inserted or blown? Check battery voltage (must be typically between 14.8V and 30.2V) Check battery polarity DC-UPS did not buffer Inhibit input was set Battery did not have enough time to be charged and is still below the deep discharge protection limit.