Data Sheet

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UB20.241

UB-Series

24V, 20A, DC-UPS

DC-UPS CONTROL UNIT

 No Change in Output Voltage in Battery Mode

 Selectable Output Voltages in Battery Mode

 1-Battery-Concept

Each 12V Battery is Charged and Monitored Separately

for Longest Battery Life

 Precise Battery Charging by Using a Temperature Sensor

 Battery Size Selector for Small or Large Batteries

 50% BonusPower

, 30A for up to 4s

 High Breaking Capacity for Branch Protectors

 Smart Battery Diagnostics and Monitoring Functions

 3 Year Warranty

1/31

GENERAL DESCRIPTION

The UB20.241 uninterruptible power supply controller

(DC-UPS) is used in addition with a 24V power supply

and batteries to bridge power failures or voltage

fluctuations. This configuration can prevent expensive

downtimes, long restart cycles and loss of data.

A unique feature of the UB20 series is the constant

voltage in battery mode, which will not change as the

batteries discharge. The buffer voltage in battery mode

can be set to four different output values. Another

feature is the utilization of two independent battery

chargers for the two 12V-batteries in series. This feature

makes matching batteries unnecessary and allows for

precise battery charging, testing and optimized usage

of the battery capacity to achieve the longest battery

service life.

The UB20.241 includes many battery diagnostic

functions that ensure a reliable operation of the entire

system. Furthermore, a temperature controlled charging

extends the life of the batteries. It also includes a

selectable buffer time limiter as well as ready, buffering

and replace battery contacts. For safety and

maintenance, an inhibit input signal is included which

prevents a battery backup.

SHORT-FORM DATA

Input voltage DC 24V

-±25%

18-30Vdc

Output voltage same as input

voltage

in power supply

mode

22.5V, 24V, 25V,

26V (selectable)

in battery mode

Output current 25A continuous

30A for 4s

in power supply

mode

20A continuous

30A for 4s

in battery mode

at 22.5V

Allowed battery

sizes

3.9 – 150Ah 2 batteries in

series, each 12V

Buffer time 6min 45s at 20A, 7Ah

16min 47s at 20A, 12Ah

2h 49min at 20A, 65Ah

6h 20min at 20A, 140Ah

Temperature range -40°C to +70°C operational

Derating 0.5A/°C +60°C to +70°C

Dimensions 46x 124x 127mm W x H x D

Weight 700g / 1.54lb

ORDER NUMBERS

DC-UPS UB20.241 Standard DC-UPS unit

Accessory UZK24.071 Battery module 24V, 7Ah

UZO24.071 UZK24.071 without batteries

UZK24.121 Battery module 24V, 12Ah

UZO24.121 UZK24.121 without batteries

UZS24.100 Sensor & center tap board

ZM2.WALL Panel/ wall-mount bracket

ZM12.SIDE Side-mount bracket

MARKINGS

IND. CONT. E

I.T.E.

Class I Div 2

IECEx ATEX

II 3G Ex nA nC II T4 Gc

Marine

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.

www.pulspower.com Phone +49 89 9278 0 Germany

Summary of content (31 pages)

PAGE 1
UB20.
PAGE 2
UB20.241 24V, 20A, DC-UPS UB-Series INDEX Page 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. Terminology and Abbreviations.........................3 Intended Use .......................................................4 Installation Notes ................................................4 Input / Output .....................................................6 Batteries and Battery Charging ........................10 Buffer Time........................................................
PAGE 3
UB20.241 24V, 20A, DC-UPS UB-Series 1. TERMINOLOGY AND ABBREVIATIONS DC-UPS Abbreviation for Uninterruptible Power Supply system with a DC input and a DC output. A DC-UPS utilizes batteries as back-up energy source. Power supply mode Describes a condition where the input voltage is in the rated input voltage range and the supplying power supply can deliver a sufficient amount of current for the DC-UPS and the load.
PAGE 4
UB20.241 24V, 20A, DC-UPS UB-Series 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.
PAGE 5
UB20.241 24V, 20A, DC-UPS UB-Series WARNING Risk of electrical shock, fire, personal injury or death. - Turn power off and disconnect the battery fuse before working on the device. Protect against inadvertent repowering. - Make sure that the wiring is correct by following all local and national codes. - Do not modify or repair the unit. - Do not open the unit as dangerous voltages may be present inside. - Use caution to prevent any foreign objects from entering the housing.
PAGE 6
UB20.241 24V, 20A, DC-UPS UB-Series 4. INPUT / OUTPUT The output is connected to the input through a back-fed protection (MOSFET). In power supply mode, the output voltage follows the input voltage decreased by a small voltage loss. In battery mode, the output voltage is a constant voltage, which can be preselected in one of four voltages. Input Voltage Range: At voltages within the input voltage range, control functions such as LEDs, monitoring features, relay contacts, etc. are functioning normally.
PAGE 7
UB20.241 24V, 20A, DC-UPS UB-Series Input voltage Input voltage range nom. nom. DC 24V -±25% 18-30Vdc max. 30-35Vdc max. 35Vdc typ. typ. typ. typ. 23.5 – 30Vdc 25 – 30Vdc 26 – 30Vdc 27 – 30Vdc typ. typ. typ. typ. 23.5Vdc 25Vdc 26Vdc 27Vdc Control functions such as LEDs, monitoring features, relay contacts, etc. are working. The unit can either be in power supply mode or in battery mode. See Fig. 4-2. Temporarily allowed, no damage to the DC-UPS.
PAGE 8
UB20.241 24V, 20A, DC-UPS UB-Series Output current in power supply mode nom. nom. nom. in battery mode nom. typ. Overload behavior in power supply mode in battery mode Output short circuit current in power supply mode in battery mode Return current typ. typ. Allowed voltage between input and earth (chassis) Capacitive and inductive loads 1) 2) 3) 4) max. 25A 30A 20A at 22.5V, 18A at 26V 30A at 22.5V, 26A at 26V 80A Continuously allowed For max. 5s Continuously allowed see Fig.
PAGE 9
UB20.241 24V, 20A, DC-UPS UB-Series Fig. 4-6 Select an appropriate power supply, which can deliver the additional current for charging and internal consumption the DC-UPS Fig. 4-7 Battery mode: Output voltage vs. output current, typ. Output Voltage 28V Input Current Output Current 22.5V 20 Hiccup mode 12 8 Current consumption for battery charging 4 0 Output Current 0 Fig. 4-8 Battery mode: HiccupPLUS behavior during a short-circuit on output, typ. 4 8 12 16 20 24 28 32A Fig.
PAGE 10
UB20.241 24V, 20A, DC-UPS UB-Series 5. BATTERIES AND BATTERY CHARGING The battery is not included in the DC-UPS. Use one of the PULS 24V battery modules (see chapter 22.4 and 22.5). In addition to the PULS battery modules, the UB20.241 is also designed to be compatible with a large variety of different VRLA (Valve Regulated Lead Acid) or SLA (Sealed Lead Acid) batteries from various suppliers.
PAGE 11
UB20.241 24V, 20A, DC-UPS UB-Series Setting of battery size selector - ctd. Deep-discharge protection Required min. battery voltage to allow charging 3) Battery charging time Battery discharge current 1) 2) 3) 4) 5) typ. small battery < 10Ah 10.5V / 9.0V large battery > 10Ah 10.5V / 9.0V typ. 21V / 18V 21V / 18V min. 2 x 7V 2 x 7V At 0A / 20A buffer current, center-tap connected, Buffering stops as soon as one battery falls below this value.
PAGE 12
UB20.241 24V, 20A, DC-UPS UB-Series 6. BUFFER TIME The buffer time (sometimes also called autonomy time) is the maximum period of time for which the battery can maintain the required output current. The buffer time mainly depends on the capacity and quality of the battery and the output current in battery mode. The following times are typical values for a new product and the aging effect during operation is not included.
PAGE 13
UB20.241 24V, 20A, DC-UPS UB-Series Fig. 6-2 Buffer time curves for battery modules UZK24.071 and UZK24.121, typ. Buffer Current 20A 18A Batteries: A... 7Ah (UZK24.071) B... 12Ah (UZK24.121) 16A 14A 12A 10A A B 8A 6A 4A B 2A A 0A 0 10 20 30 40 50 60 70 80 90 1,5 2 3 Minutes Hours 4 5 6 7 8 9 10 Buffer Time Fig. 6-3 Buffer time curves for various battery sizes, typ. Buffer Current 20A 18A Batteries: A... 7Ah B... 12Ah C... 26Ah D... 65Ah E... 100Ah F...
PAGE 14
UB20.241 24V, 20A, DC-UPS UB-Series 7. READY AND BUFFERING RELAY CONTACT The DC-UPS is equipped with two independent relay contacts for remote monitoring and controlling of the unit. Ready contact Contact is closed when both batteries are charged more than typical 85%, no wiring failure is detected, input voltage is sufficient and inhibit signal is not active. Contact ratings Isolation voltage max. 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A min. 1mA at 5Vdc see chapter 19. resistive load min.
PAGE 15
UB20.241 24V, 20A, DC-UPS UB-Series 10. EFFICIENCY AND POWER LOSSES Efficiency typ. 99% Power losses typ. 1.9W typ. 4.8W typ. 6.8W typ. 4.6W typ. typ. typ. 4.2W 7.6W 21.
PAGE 16
UB20.241 24V, 20A, DC-UPS UB-Series 12. FUNCTIONAL DIAGRAM Fig.
PAGE 17
UB20.241 24V, 20A, DC-UPS UB-Series 14. FRONT SIDE AND USER ELEMENTS Fig. 14-1 Front side A Input Terminal (screw terminal) B Output Terminal (screw terminal) One extra (-) pole for easy grounding. The minus-pole is internally hard-wired with the minus-pole of the input and battery terminals. C Signal Connector (8-pole plug connector) comprises the following connections: - Ready relay contact, see chapter 7. - Buffering relay contact, see chapter 7. - Inhibit input signal, see chapter 9 and chapter 23.8.
PAGE 18
UB20.241 24V, 20A, DC-UPS UB-Series Fig. 14-2 Flashing pattern for green “Status LED” 1 0 Ready 1 0 Charging 1 0 10 Hz Buffering Each battery has its own status LED. The signals are the same for both batteries. Ready: The LEDs are on solid when the battery is charged (> 85%), no wiring failure is recognized, input voltage is sufficient. After the unit is turned-on with charged batteries, it can take 20s or longer that the signal switches from charging to ready.
PAGE 19
UB20.241 24V, 20A, DC-UPS UB-Series 15. EMC The DC-UPS is suitable for applications in industrial environment as well as in residential, commercial and light industry environment without any restrictions. All tests are performed in power supply and battery mode.
PAGE 20
UB20.241 24V, 20A, DC-UPS UB-Series 16. ENVIRONMENT Operational temperature *) -40°C to +70°C (-40°F to 158°F) Derating Storage temperature Humidity **) Vibration sinusoidal 2.5%/°C -40 to +70°C (-40°F to 158°F) 5 to 95% r.H. 2-17.8Hz: ±1.6mm; 17.
PAGE 21
UB20.241 24V, 20A, DC-UPS UB-Series 17.
PAGE 22
UB20.241 24V, 20A, DC-UPS UB-Series 19. DIELECTRIC STRENGTH The signal port (relay contacts and inhibit input) are floating and separated from the power port (input voltage, output voltage, center-tap terminal and temperature sensor). Type and factory tests are conducted by the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies the voltage with a slow ramp (2s up and 2s down).
PAGE 23
UB20.241 24V, 20A, DC-UPS UB-Series 21. PHYSICAL DIMENSIONS AND WEIGHT Width Height Depth Weight DIN-rail Housing material Installation clearances 46mm 1.81’’ 124mm 4.88’’ 127mm 5.0’’ The DIN-rail height must be added to the unit depth to calculate the total required installation depth. 700g / 1.54lb Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm. Body: Aluminium alloy Cover: zinc-plated steel See chapter 2 Fig. 21-1 Front view Fig. 21-2 Side view Feb. 2016 / Rev.
PAGE 24
UB20.241 24V, 20A, DC-UPS UB-Series 22. ACCESSORIES 22.1. ZM2.WALL – WALL-MOUNTING BRACKET This bracket is used to mount the DC-UPS onto a flat surface without utilizing a DIN-rail. 22.2. ZM12.SIDE – WALL-MOUNTING BRACKET This bracket is used to mount 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.
PAGE 25
UB20.241 24V, 20A, DC-UPS UB-Series 22.4. UZK24.071 – 24V, 7AH BATTERY MODULE The UZK24.071 passive battery module utilizes two non-spillable 7Ah maintenance-free lead-acid batteries (connected in series), that are assembled in one package with all the required wiring included. The battery module includes the monitoring and protection board UZS24.100.
PAGE 26
UB20.241 24V, 20A, DC-UPS UB-Series 23. APPLICATION NOTES 23.1. BATTERY REPLACEMENT INTERVALS There are two main causes for battery failures and the need for replacing them: - Random failures: Within the defined service life of a battery, random battery failures can happen. E.g. short circuit in one cell, broken cell connection, acid pollution, mechanical defects, … . Such failures occur randomly and cannot be predicted.
PAGE 27
UB20.241 24V, 20A, DC-UPS UB-Series battery chargers and the temperature tracking feature of the UB20.241, the end-of-charge-voltage can be set very precisely to the required value and thereby avoiding unnecessary aging effects. - Discharged batteries: Charge retention is important to get the longest battery life. Stored batteries which are not fully charged age faster then charged batteries. Batteries which are not in use should be recharged at least once a year.
PAGE 28
UB20.241 24V, 20A, DC-UPS UB-Series 23.2. EXTERNAL INPUT PROTECTION The DC-UPS is tested and approved for branch circuits up to 28A. An external protection is only required, if the supplying branch has an ampacity greater than this. If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of the circuit breaker. A minimum value of 25A B- or C-Characteristic breaker should be used. Check also local codes and local requirements.
PAGE 29
UB20.241 24V, 20A, DC-UPS UB-Series 23.5. PARALLEL USE TO INCREASE OUTPUT CURRENT Two DC-UPSs with two individual power supplies, two battery modules and one decoupling module can be used to build a system with higher output current. Fig. 23-4 Wiring example for parallel use to increase the output current (13) (12) (11) + - Center-tap + + - - DC 24V, 20A Output Temp. Sensor Power Supply UZK24 Battery Module AC Input L N PE - + + IN - OUT UB20.
PAGE 30
UB20.241 24V, 20A, DC-UPS UB-Series 23.7. SERIES USE FOR 48V APPLICATIONS A series connection for 48V applications is allowed when utilizing two individual power supplies, two DC-UPSs and two battery modules. (13) (12) (11) Ready AC Input L N PE Replace Battery UB20.241 DC-UPS Power Supply - - + + + BAT - - DC 24V, 20A Output Center-tap Temp. Sensor Power Supply UZK24 Battery Module AC Input L N PE + - - + + IN - + OUT UB20.241 DC-UPS - + - BAT (13) (12) (11) Center-tap Temp.
PAGE 31
UB20.241 24V, 20A, DC-UPS UB-Series 23.9. TROUBLESHOOTING The following guidelines provide instructions for fixing the most common failures and problems. Always start with the most likely and easiest to check condition. Some of the suggestions may require special safety precautions. See notes in section 3 first. Symptom: Explanation / Action: Single flash on the “Error” LED - “Error” LED is solid on - Check correct wiring between the battery and the DC-UPS - Check battery fuse.