Power Supply and Distribution System Troubleshooting

The power input to the downstream device is abnormal.

• The switch trips abnormally.
• The UPS is faulty.

• Use a multimeter to check whether there is a short circuit. Turn on the switch again, and check whether the system is overloaded.

• Restart the UPS. If the UPS is faulty, replace it.

The surge protection function fails.

• The SPD circuit breaker is OFF.
• The SPD ground cable is not connected.
• The surge protection module is abnormal. The SPD window is red.

• Check that the SPD circuit breaker is turned on. The power distribution subrack (monitoring type) will prompt an alarm indicating that the SPD circuit breaker is not turned on.
• Check whether the SPD ground cable is properly connected.
• Replace the surge protection module. For details, see Replacing a Surge Protection Module.

The general switch is ON, the LCD displays no information, and the system does not perform self-check.

The input power supply is not connected.

Check the UPS input power cable connection.

The input voltage is less than the lower threshold or greater than the upper threshold.

Use a voltmeter to check whether the UPS input voltage meets requirements.

The mains is normal, but the AC input indicator is off. The UPS works in battery mode.

The UPS mains switch is OFF.

Turn on the UPS mains switch.

The input cable is not properly connected.

Check the UPS input power cable connection.

The UPS fails to communicate.

• The UPS communications cable is not properly connected.
• The UPS parallel cable is not properly connected.
• The UPS is deleted on the ECC800-Pro WebUI.

• Reconnect the UPS communications cable.
• Reconnect the UPS parallel cable.
• Remove the network cable from the MON1 port on the UPS, reinstall the cable, and add the UPS on the ECC800-Pro WebUI.

The UPS does not report a fault but has no output voltage.

The output cable is not properly connected.

Check the output power cable connection.

The UPS does not start after you press .

is not pressed long enough.

Press for more than 5 seconds until you hear a beep sound.

The UPS is overloaded.

Shut down all loads, and restart the UPS.

The mains indicator is off.

The mains voltage or frequency exceeds the UPS input range.

Use a multimeter to verify that the input voltage and frequency meet specifications.

The battery discharge time is obviously shorter than the standard time.

Batteries are not fully charged.

Charge batteries for more than 8 hours when the mains is normal. Test the discharge time again.

The battery performance deteriorates.

Contact your local Huawei technical support to replace batteries.

Abnormal noise or smell is generated in the UPS cabinet.

The UPS is faulty.

Shut down the UPS and cut off the power input immediately. Contact your local Huawei technical support.

The battery indicator blinks. The buzzer buzzes 1 second and then stops 1 second. The battery reserve is insufficient. The UPS is about to shut down.

• The UPS will soon shut down due to insufficient battery reserve, and loads will be powered off.
• The number of batteries and battery capacity are incorrectly set.

• Save load data immediately and shut down primary loads to avoid data loss or damage.
• Connect the UPS input to the backup AC power supply immediately.
• Verify that the number of batteries and battery capacity are correctly set based on the actual configuration.

The user forgot the password.

None

• If the user forgot only the LCD password (the preset password is 000001), use the feature code (the preset feature code is 999999) to activate the LCD password.
• If the user forgot the LCD password and feature code, contact your local Huawei technical support.