Online UPS Q&A
Model Numbers: DN-170093, DN-170094, DN-170095, DN-170096
1. Alarm or Fault Reference Code
| Event log | UPS Alarm Warning | Buzzer | LED |
|---|---|---|---|
| 1 | Rectifier Fault | Beep continuously | Fault LED lit |
| 2 | Inverter fault (Including Inverter bridge is shorted) | Beep continuously | Fault LED lit |
| 9 | Fan fault | Beep continuously | Fault LED lit |
| 12 | Selftest fault | Beep continuously | Fault LED lit |
| 13 | Battery Charger fault | Beep continuously | Fault LED lit |
| 15 | DC Bus over voltage | Beep continuously | Fault LED lit |
| 16 | DC Bus below voltage | Beep continuously | Fault LED lit |
| 17 | DC bus unbalance | Beep continuously | Fault LED lit |
| 18 | Soft start failed | Beep continuously | Fault LED lit |
| 19 | Rectification model Over Temperature | Twice per second | Fault LED lit |
| 20 | Inverter model Over Temperature | Twice per second | Fault LED lit |
| 26 | Battery over voltage | Once per second | Fault LED blinking |
| 29 | Output Short-circuit | Once per second | Fault LED blinking |
| 30 | Input current limit | Once per second | Fault LED blinking |
| 31 | Bypass over current | Once per second | BPS LED blinking |
| 32 | Overload | Once per second | INV or BPS LED blinking |
| 33 | No battery | Once per second | Battery LED blinking |
| 34 | Battery under voltage | Once per second | Battery LED blinking |
| 35 | Battery low pre-warning | Once per second | Battery LED blinking |
| 36 | Overload time out | Once per 2 seconds | Fault LED blinking |
| 37 | DC component over limit. | Once per 2 seconds | INV LED blinking |
| 39 | Mains volt. Abnormal | Once per 2 seconds | Battery LED lit |
| 40 | Mains freq. abnormal | Once per 2 seconds | Battery LED lit |
| 41 | Bypass Not Available | Once per second | BPS LED blinking |
| 42 | Bypass out of tracking range | Once per second | BPS LED blinking |
| 45 | EPO Enable | Beep continuously | Fault LED lit |
Fault analysis:
When a fault occurs, record the status of display, and then fix the reason in accordance with the following questions.
- If the input supply is abnormal? (over/under voltage)
- If load changes? (capacity or type)
- If a burn mark on PCBA?
- If smelly odor?
- If abnormal noise?
- If bad environment? (dust or moisture)
- High temperature of UPS or ambient environment?
If fault occurs inside the UPS, contact your dealer with UPS S/N, photos of error code, load type, and environmental information.
2. Troubleshooting
If the UPS system does not operate correctly, please solve the problem by using the table below and the Trouble Shooting Chart.
| Symptom | Possible cause | Remedy |
|---|---|---|
| No indication and alarm even though the mains are normal. | 1. The AC input power is not connected well. 2. The AC input is connected to the UPS output. |
|
| Alarm code is shown as "33" and battery led blinking. | The external or internal battery is incorrectly connected. | Check if all batteries are connected well. |
| Alarm code is shown as "26" and battery led blinking. | Battery voltage is too high, or the charger is fault. | Contact your dealer. |
| Alarm code is shown as "34" and battery led blinking | Battery voltage is too low, or the charger is fault. | Contact your dealer. |
| Alarm code is shown as "32" and INV or BYPASS led blinking. | UPS is overload | Remove excess loads from UPS output. |
| Alarm code is shown as "29" and FAULT led light. | The UPS shut down automatically because short circuit occurs on the UPS output. | Check output wiring see if connected devices are in short circuit status. |
| Alarm code is shown as "9" and FAULT led light. | Fan fault. | Contact your dealer. |
| Alarm code is shown as "01,02,15,16,17,18" | A UPS internal fault has occurred. | Contact your dealer. |
| Alarm code is shown as 45 | EPO is not fixed properly when not used. | Put the jumper cap (pin) back on EPO port to avoid to trigger the EPO function. |
| Battery backup time is shorter than nominal value | 1. Batteries are not fully charged 2. Batteries defect |
|
3. Question
Which environment or loading is Digitus Online UPS suitable for?
Answer: Digitus Online UPS is suitable for workstations, network servers, computer rooms and data center. Digitus Online UPS cannot connect motor loads, such as laser printers and refrigerators.
My UPS is showing the battery at 0V voltage and 0% capacity on the display. Does the battery need to be replaced?
Answer: Please run battery test (UPS self-test mode): Press and hold "On/Enter Button" for 2 seconds to enter UPS self-testing while in AC mode. If it is still abnormal, please help to check each battery with multi-meter. If a battery voltage is less than 10V; then the battery is broken and needs a replacement.
Note: The lifetime of a lead-acid battery is 2-4 years, even if it is not used frequently at all.
We turned on the UPS but is no voltage coming out of the UPS (does not supply), no alarm, and no information from the screen. Why?
Answer: When starting up the online UPS, user needs to press ON button for over 3 seconds. Even though a short press can light up the LCD, but it only acts as the charger to charge the batteries. Inverter is not working so there is no output in the socket.
What are the proper instructions for calibration?
Answer: Calibration:
- Keep UPS at AC mode, to charge the batteries for at least 12 hours
- Connect testing load under AC mode.
- Switch to battery mode, discharge battery until reaching EOD and UPS switches off. Record the autonomy time.
- **UPS will calibrate automatically after a cycle of fully charge & fully discharge**
- Switch to AC mode & charge the battery for at least 12 hours
- Connect testing load under AC mode
- Switch to battery mode. Check whether the autonomy time on the display is close to the autonomy time you recorded in step 4.
To ensure display the battery backup time more accurately, it is necessary to set the correct battery capacity.
| All UPS and EBP cabinets | Number of battery strings | UPS LCD Battery capacity setting |
|---|---|---|
| UPS only (internal batteries) | 1 (default) | 9AH (default) |
| UPS + 1 EBP | 3 | 27 AH |
| UPS + 2 EBPS | 5 | 45AH |
| UPS + 3 EBPS | 7 | 63AH |
| UPS + 4 EBPS | 9 | 81AH |
Note: The UPS contains one battery string; each EBP contains two battery strings.
What is error 33?
Error 33 means no battery, could be loose wiring or bad battery. Please open the front panel and take out the battery box, check whether all cables are fixed properly. Then, please measure the battery voltage one by one. If the battery voltage is under 10V, it means the battery has reached the end of its life and needs to replace all the batteries.
Several reasons make batteries end of life. The more charge and discharge, the sooner it reaches the end of life. Other reasons could be not charging the battery for 3-6 months (depending on storage temp.), connecting low load and slow discharge that causes battery overdrain, etc.
What is the solution of Error 45: EPO?
Answer: Error 45 means EPO enable. Please ask the client to check whether EPO is fixed properly.
From the factory delivery, there should be a jumper cap (pin) on the EPO port to avoid triggering the EPO function. Customer should not remove the pin if EPO function is not used.
The UPS back panel features several ports. The Emergency Power Off (EPO) port is shown with a jumper cap inserted, preventing accidental activation. The RS232 port is also visible.
Error 45 Details: EPO Enable, Buzzer: Beep continuously, LED: Fault LED lit.
What is error 27 & 28? What should we do to solve the problem?
Answer: The error code 27 & 28 is L/N reverse. Please plug the power cord in the other direction.
| Symptom | Possible cause | Remedy |
|---|---|---|
| Alarm code is shown as "27&28" and FAULT led light. | Mains Input reverse& Bypass Input reverse | Check input L/N wiring in reverse connection |
