Data Sheet

UB20.241
UB-Series
24V, 20A, DC-UPS
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.
- Replace battery, see chapter 5 and 8.
D
Battery Terminal (screw terminal)
E
Battery Monitoring Connector (3-pole plug connector)
- Connection for temperature sensor for battery temperature. See chapter 5 (optional).
- “Center-Tap” connection - middle point of the two batteries See chapter 3 (optional).
F Red Error LED – This LED indicates that charging or buffering is not possible. The
flashing pattern reports the following reasons:
- Check wiring
- Insufficient input voltage
- Too high temperatures
For details see Fig. 14-4.
G
Yellow Diagnosis LED – This LED helps troubleshooting and the flashing pattern
indicates the following:
- Output overloaded (current)
- Battery replacement required
- Expired buffer time due to buffer time selector or discharged battery
- Activated inhibit input
For details see Fig. 14-3.
H
Green Status LED – Each battery has its own status LED. Battery 1 represents the
battery, which is electrically closer to the (+) pole and battery 2, which is closer
to the (-) pole. The flashing pattern of this LED reports the following information:
- Ready
- Charging
- Buffering
For details see Fig. 14-2.
I
Battery Size Selector (pluggable jumper) - For details see chapter 5.
Two positions to select battery sizes > and <10Ah. Influences the charging current, the
allowed battery temperature range and the battery quality tests. Factory set: <10Ah.
A missing jumper equals a <10Ah setting.
J
Buffer Time Limiter (rotary switch with 6 dents) - For details see chapter 6.
Limits the maximum buffer time in a buffer event to save battery energy. Selectable
between 10s 30s, 60s, 3 minutes and 10 minutes. If no limitation is selected (infinite
period of time), the buffering will be ended by the deep discharge protection.
Factory set: infinite.
K
Buffer Voltage Selector (rotary switch with 4 dents) - For details see chapter 4.
Allows setting the output voltage in battery mode to 22.5V, 24V, 25V or 26V.
Factory set: 22.5V
L
Chassis Ground (screw)
Use a M4 ring-type terminal to connect the housing to ground, when required.
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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