Data Sheet

UB20.241
UB-Series
24V, 20A, DC-UPS
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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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 - Check input voltage.
The input voltage must be at least 1V higher than the selected buffer
voltage and smaller than 30V.
“Error” LED is solid 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 between 14.8V and 30V)
- Check battery polarity
DC-UPS did not buffer - Inhibit input was set.
- Battery did not have enough time to get charged and the battery
voltage is still below the deep-discharge protection level.
DC-UPS stopped buffering - Deep discharge protection stopped buffering. Use a larger battery, or
allow sufficient time for charging the battery.
- End of service life of the battery
- Battery did not have enough time to be charged.
- Inhibit input was activated
- Buffer time limiter stopped buffering. Change the settings of the buffer
time limiter on the front of the unit.
- At too high temperatures
DC-UPS stopped buffering for 1s - Center-tap connection opens in buffer mode
- Center-tap connection problems
DC-UPS constantly switches between
power supply mode and battery mode
- The supplying source on the input is too small and can not deliver
sufficient current. Use a larger power supply or reduce the output load.
- The output voltage of the power supply dips to a too low value. The
input voltage must always be at least 1V higher than the selected
buffer voltage and smaller than 30V.
Increase the output voltage of the power supply
- Too high voltage drops on wires. Increase the output voltage of the
power supply or increase the wires cross section from the power supply
to the DC-UPS.