What to do if Delta Electronics RT signals '+/-DC BUS High/ Low'?
- HHeather AlexanderSep 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 RT 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 RT 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 UPS 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 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 UPS 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 UPS 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.
| Category | UPS |
|---|---|
| Model | RT Series |
| Transfer Time | 0 ms |
| Humidity | 0-95% non-condensing |
| Dimensions | Varies by model |
| Weight | Varies by model |
| Type | Online |
| Topology | Double Conversion |
| Output Power Capacity | 1kVA to 20kVA |
| Input Voltage | 230/240 VAC |
| Output Voltage | 230/240 VAC (Varies by model, user configurable) |
| Output Voltage Regulation | +/- 1% |
| Communication Interface | RS232, USB, SNMP (Optional) |
| Battery Type | Sealed Lead-Acid (SLA) |
| Operating Temperature | 0-40°C |
| Storage Temperature | -15-50°C |
| Form Factor | Rackmount/Tower (Convertible) |
| Efficiency | Up to 95% (Varies by model and load) |
Key safety guidelines for UPS usage, handling, placement, and warnings.
Details the various functions and key features of the UPS.
Explains the components and layout of the UPS control panel.
Step-by-step guide for installing the UPS in a rack-mount configuration.
Step-by-step guide for installing the UPS in a vertical tower configuration.
Important safety and procedural warnings before making any connections.
Instructions for connecting an optional external battery pack to the UPS.
Steps for connecting the UPS to the main AC power source.
Step-by-step guide for turning on the UPS.
Step-by-step guide for turning off the UPS.
Describes overload protection behavior in different modes.
Critical warnings and precautions before replacing internal batteries.
Details error codes, possible causes, and solutions for 7-segment display errors.
Discusses common problems like overload and battery issues with solutions.