No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search


To have a better experience, please upgrade your IE browser.


TP48200A-DT19D1 Telecom Power User Manual

Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
DC Under Volt

DC Under Volt

Possible Causes

  • An AC power failure has occurred.
  • The DC undervoltage alarm threshold is incorrectly set on the SMU.
  • The system configuration is incorrect.
  • The power system voltage has been manually set to a very low value.
  • Rectifiers are faulty.


  1. Check whether an AC power failure has occurred. If so, rectify the fault to restore the AC power supply.
  2. Check whether the DC undervoltage alarm threshold (45 V DC by default) is correctly set. If not, set the threshold to the correct value.
  3. Check whether the load current is greater than the present power system capacity. If so, expand the power system capacity or reduce the load power.
  4. Check whether the system voltage has been manually set to a very low value. If so, check with other maintenance personnel whether the voltage can be changed to a normal value.
  5. Check whether faulty rectifiers have resulted in insufficient power system capacity for the loads. If so, replace the faulty rectifiers.
Updated: 2019-11-27

Document ID: EDOC1000078784

Views: 24602

Downloads: 505

Average rating:
This Document Applies to these Products

Related Version

Related Documents

Previous Next