What to do if Delta Electronics UPS signals '+/-DC BUS High/ Low'?
- RRobin WelchSep 8, 2025
If your Delta Electronics UPS indicates '+/-DC BUS High/ Low', it means that the UPS has abnormalities. Contact service personnel.

What to do if Delta Electronics UPS signals '+/-DC BUS High/ Low'?
If your Delta Electronics UPS indicates '+/-DC BUS High/ Low', it means that the UPS has abnormalities. Contact service personnel.
What to do if Delta Electronics UPS signals Inverter Fault?
If your Delta Electronics UPS indicates an inverter fault, it means that the UPS has abnormalities. Contact service personnel.
What to do if Delta Electronics RT-1K signals DC-DC Fault?
If your Delta Electronics UPS indicates a DC-DC fault, it means that the UPS has abnormalities. Contact service personnel.
What to do if Delta Electronics RT-1K signals Abnormal Output/ Inverter Voltage?
If your Delta Electronics UPS indicates an abnormal output or inverter voltage, it means that the UPS has abnormalities. Contact service personnel.
What to do if Delta Electronics RT-1K signals 'Shutdown After' Shutdown?
If your Delta Electronics UPS indicates 'Shutdown After' shutdown, it means that the function is enabled. Contact service personnel.
What to do if Delta Electronics RT-1K signals 'Battery Save' Shutdown?
If your Delta Electronics UPS indicates ''Battery Save' shutdown', it means the function is enabled because the total load is too small or there is no load connected, after running in battery mode for 30 minutes. Contact service personnel.
| Brand | Delta Electronics |
|---|---|
| Model | RT-1K |
| Category | UPS |
| Language | English |
Covers intended use, handling, placement, general warnings, usage, and battery precautions.
Overview of the UPS operation panel components (LEDs, LCD, buttons).
Explains icons, 7-segment, and 16-segment displays on the LCD.
Lists error codes, meanings, and possible causes for troubleshooting.
Shows rear panel layout and details functions of ports and connectors.
Step-by-step guide for rack-mounting the UPS and external battery pack.
Step-by-step guide for tower-mounting the UPS and external battery pack.
Steps for connecting the UPS to the AC utility power.
Overview of settings configurable in Setup mode and setup procedures.
How to perform manual and automatic battery tests.
Critical warnings and precautions before replacing internal batteries.
Lists error codes, meanings, possible causes, and solutions.
Detailed specifications for RT-1K, RT-2K, RT-3K models and external battery packs.
Seller warranty terms, exclusions, and maintenance service details.