2. After the mains power is cut off, the UPS cannot switch to the inverter state for operation.
Set the multimeter to the voltage range and connect the probe to the Anderson plug on the back of the UPS to directly measure the DC voltage reaching the UPS while the UPS is operating under mains power. At this point, one person is observing the display on the multimeter, while another person unplugges the input line of the UPS and observes the display on the multimeter at the moment of power failure. If the voltage drops significantly, it indicates that there is a problem with the battery. If the connection issue can be ruled out and the battery has been in use for about two years, it is necessary to consider replacing the battery pack.
3. The UPS inverter time is short and cannot meet customer requirements.
Smart UPS long delay models must set battery parameters at the beginning of installation. If battery parameters are not set, problems such as short inverter time may occur. Secondly, the battery parameters have been set, but the UPS inverter time is still very short. You can measure the battery voltage when the UPS low power alarm is triggered. If the measurement shows that the battery is indeed in a low power state, then the battery needs to be replaced. If the measured value shows that the battery is not in a low battery state, then you need to perform a charge discharge verification. Note that during charge and discharge verification, the battery must be fully charged and discharged with around 50% load.
Thirdly, the PowerChutePlus software has been installed. As the default setting of the software is to shut down the computer after 5 minutes of mains power interruption, you need to modify the parameters in the software
Electricity environment in the city.
1. Power grid interference.
If there is severe interference in the power grid, such as voltage sag and other power disturbances, it may cause UPS to experience power outages and other malfunctions. Below are some examples of such mains interference. You can install PowerChutePlus software to check for power interference in the network through the software’s event records. If you see many such records in the event log, it indicates that there is significant interference in your mains power and network, which can also reduce the lifespan of the battery. If conditions permit, it is recommended that you replace the mains power input or renovate the power grid.
PowerChutePlus event record can record mains interference
UPS on battery: Deep momentary sag
UPS on battery: Large momentary spike
UPS on battery: Brownout
UPS on battery: High input Line voltage
UPS on battery: Small momentary spike
UPS on battery: Small momentary sag
2. The UPS input terminal is equipped with a leakage protector.
When the UPS is turned on, it will cause the leakage protector to trip. If you need to install a leakage protector, you need to connect it to the output line of the UPS
3. The air switch at the UPS input has tripped.
This phenomenon may be caused by the small capacity of the air switch at the input end of the UPS, as the starting current of the UPS is relatively large, so it is required that the capacity of the front air switch be sufficiently large.
4. UPS inverter status and online status frequently switch.
The first possibility is caused by fluctuations in the electricity supply. Secondly, if you use a generator, this situation may occur.