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What are the common UPS faults and how to rectify them?

UPS can't start the

for UPS is started by dc, so when there is no battery, low battery or the battery cases such as UPS can't start. There are several similar situation:


the first case: the newly installed UPS can't start.

Check whether the battery connector on the rear panel of the UPS is connected. Because the new battery will self-discharge during storage, the UPS cannot be started when the battery is in a low power state. In this case, you need to connect the UPS to the battery and the mains. Press the Test button on the front panel of the UPS. Although the display light on the UPS panel will not turn on, the UPS will charge the battery. After charging for a period of time, press the Test key to start the UPS.

the second case: UPS work after a period of time, UPS can't start.

Also because the battery is low, the battery needs to be charged.

the third kind of situations: battery for two years or so, UPS can't start.

According to the use of most customers, the battery will generally have more or less capacity decline after two years of use, if the battery can not play the role of delay, it needs to be replaced with a new battery.

4 kinds of circumstances: single battery voltage is normal, but UPS can't start.

1. It is likely that there is a problem with the connection between the battery and the battery or the connection between the battery and the UPS, such as: the connection point is not strong or there is oxidation at the connection point, then it is necessary to remove the oxide and reconnect.

2. The insurance connection between the UPS and the battery may be broken. If the insurance is broken, replace it with another insurance.

3. The connection between the UPS and the battery is very long, very thin, or there is a connection point in the middle, resulting in a large voltage drop, causing the UPS to fail to start.

2, the UPS can not be switched to the inverter state after the mains power failure

Let the UPS work in the mains state, the multimeter is set in the voltage file, the pen is connected to the Anderson plug on the back of the UPS, and directly measure the DC voltage to the UPS. At this time, a person to observe the multimeter display, another person unplug the UPS input line, observe the multimeter display at the moment of power failure, if the voltage value instantly drops a lot, indicating that there is a problem with the battery, if you can exclude the problem on the connection, and the battery has been used for about two years, you need to consider replacing the battery pack.

3, UPS inverter time is short, can not meet customer requirements

First, the UPS long delay model must be set at the beginning of the installation of battery parameters, if the battery parameters are not set, there will be a short inverter time such a problem.

Second, 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, if the measurement value shows that the battery is indeed in a low power state, it needs to replace the battery. If the measurement shows that the battery is not in a low charge state, you need to make a charge and discharge check. Note that in the charge and discharge verification, the battery should be full, and about 50% of the load should be taken when discharging.

4, grid environment

        1) grid interference:

        the presence serious interference in the power grid, such as voltage sag and the power interference may cause malfunction phenomenon such as UPS without power.

        2) UPS input installed leakage protector:

                        UPS is big leakage current, When the UPS is turned on, the leakage protector will trip. If you need to install a leakage protector, you need to connect the leakage protector to the output line of the UPS.

        3) UPS at the input air switch trip:

     This phenomenon may be caused by the small capacity of the air switch at the UPS input, because the starting current of the UPS is relatively large, so the capacity of the front end of the air switch is required to be large enough.

        4) UPS and online state frequent transformation:

        first, it is possible that mains fluctuation.

        second, if you use the generator, so this occurs.

        5) man-made fault

        the UPS input phase sequence, Cause the input safety to fuse;

        battery maintenance, improper operation caused by short circuit or will pick the is negative;

        will not UPS running in normal mode (forget to close the battery circuit breaker, did not start the inverter, etc.);

        not according to the procedures prescribed steps in order to start or stop the UPS.

        6) cooling fan trigger fault

        and the environment is clean Off: Related to normal maintenance: Check the bearing temperature of the fan regularly and remove the blockage in time.

        part of fan is associated with the mains voltage, damage of the high voltage electric fan. End-of-life sign: mandatory replacement for 5 years.

        7) caused by improper maintenance fault

             1, the monitoring information and panel indicators are not clearly defined, or the physical meaning of the UPS electrical performance indicators is not clear, resulting in suspicious failures and artificial downtime;

                2, input and output connection errors or not firm and downtime caused by human failures;

                3, the machine fault phenomenon and the warning signal is not clear, and cause delay downtime;

                4, long-term lack of necessary maintenance, fault downtime due to environmental reasons;

                5, improper system configuration (if there is leakage protector in the system, contactor, circuit breaker setting is not accurate or not setting, etc.) caused by the fault;

                6, complicated system, maintenance work tedious, caused by operation fault, etc.