Notice #28 on the Eaton 9130 indicates that the DC link voltage has exceeded the safe operating range. The DC link voltage is the voltage between the positive and negative terminals of the battery bank. It is important to keep the DC link voltage within the safe operating range to prevent damage to the UPS.
The safe operating range for the DC link voltage on the Eaton 9130 is 280-450V. If the DC link voltage exceeds this range, the UPS will show Notice #28 and switch to bypass mode. This means that the UPS will no longer be able to provide power to the connected loads.
There are a few things that can cause the DC link voltage to exceed the safe operating range. One possibility is that the battery bank is not properly charged. Another possibility is that there is a problem with the UPS itself.
If you see Notice #28 on your Eaton 9130, you should first check the battery bank. Make sure that the batteries are properly charged and that there are no loose connections. If the batteries are properly charged and there are no loose connections, then you may need to have the UPS serviced.
Here are some additional tips to help you troubleshoot the issue:
- Check the battery voltage. The battery voltage should be between 28 and 45 volts.
- Check the battery temperature. The battery temperature should be between 10 and 35 degrees Celsius.
- Check the battery connections. Make sure that the battery connections are tight and that there are no corrosion.
- If you have a multimeter, you can measure the DC link voltage directly.
If you have checked all of these things and the DC link voltage is still not within the safe operating range, then you will need to call a qualified technician to diagnose the problem.
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