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1. Use a multimeter or an oscilloscope to measure the analog signal value (such as voltage 0 - 10V, current 4 - 20mA) output by the given device, and compare it with the expected given value. If the given value is 5V but the measured value is only 3V, it indicates that there is a problem with the given device, and it needs to be calibrated or replaced.

2. Carefully inspect the connection lines from the given equipment to the frequency converter to check for any open circuits, short circuits or poor contacts. Damaged lines may cause signal attenuation or interference, and poor contacts will make the signal unstable, sometimes present and sometimes absent. For example, if the connection at the line joint is loose, the measured given signal will fluctuate between normal and abnormal values.

3. Enter the parameter setting interface of the frequency converter and check whether the setting of the analog input type matches the actual given signal. For example, if the given signal is a 4 - 20mA current signal, but the frequency converter is set to a 0 - 10V voltage input, it will result in incorrect processing of the given signal.

4. Check whether the upper and lower limit values corresponding to the analog quantity in the parameter settings are correct.

5. Re-calibrate the analog input channels. Taking AI1 as an example, when the input range is 4mA to 20mA corresponding to 0 to 10V, first calibrate the lower limit of AI. Input 4mA, set P05.40 = 1, wait for the immediate information to show that the analog input value of AI1 is 0%. Then calibrate the upper limit of AI. Set P05.40 = 2, input 20mA, wait for the immediate information to show that the analog input value of AI1 is 100%, and set P05.40 = 0. The analog input calibration of AI1 is completed.

6. If the adjustment is still incorrect, you can try changing to a different analog input channel or replacing the analog module.

1. Check the components on the SCR and PFC boards.
2. Check if there is any change in the BUS voltage.
3. Check the actual voltage of the battery. If the voltage is fine, then check the battery detection circuit.(Battery sampling resistor on the input board)
4. Replace the control board

1. Before connection, connect the SMS pins 1 and 2 with 12-24V DC power. Pin 78 is connected via RS485 communication. Connect the three devices in sequence with network cables from one end to the other, and then connect them to the COM port on the SNMP card (e.g., com-temperature-humidity-water immersion-SMS (where the Phoenix terminals 3 and 4 of the water immersion sensor should be short-circuited)).
2. Connect the SNMP card, enter the device management interface, add the application, and set different addresses (this needs to be done in conjunction with the dip switch settings)
3. Enter the serial communication settings interface and set the baud rate to 9600.
4. Finally, enter the expansion device interface to check if the communication is successful and the functions are normal.

1. On the SNMP card interface - Restore factory settings - Click to clear historical record data
2. After clearing the data, restart the SNMP card and check if the alarm has been eliminated. If not, repeat the above operation.

1. First check the fuse on the monitoring board (17001-03465) to see if it is blown. This is the most common direct cause of this fault.
2. If the fuse is normal and a spare SNMP module is available on-site, replace the SNMP module directly and observe whether the indicator returns to normal.
3. If both of the above are normal, the fault is most likely in the connection cable between the SNMP module and the monitoring board（J16）.

Preventive measures:
1. During operation, ensure the SNMP module is connected to the port marked “Network”.
Incorrect connection to the “COMM” port may cause faults such as blowing the fuse on the monitoring board.

 1. It is recommended that UPS and the battery pack are from the same manufacturer. Because the charging parameters of UPS from different manufacturers are inconsistent, if the parameters do not match, it is easy to cause battery damage..
2. If it is really necessary to use separately, the charging parameters must be clearly communicated to the customer and the parameters must be recorded and filed.
3. Install a battery temperature collector, battery over-temperature alarm, to prevent fire.

A:  (The common cause of this fault is usually the problem with the cabinet.)
1. Check if the UPS parallel parameters are set properly.
2. Check if the jumpers on the UPS's parallel board are set according to the actual number of parallel units of the equipment.
3. Apply a small load to the UPS, then use a clamp meter to check if there is a significant discrepancy between the UPS output current and the current displayed on the screen, so as to determine whether the current transformer in the cabinet is abnormal. If the current is abnormal, power off the UPS completely, and use a multimeter to check the continuity of the current transformer pins in the cabinet to verify whether it is functioning properly.
4. Insert a module that can work normally into the cabinet, but if this alarm still occurs, it is recommended to replace the monitoring board of the cabinet.
5. If it is determined that the problem lies in the power module, first check the output board of the module. If there is no issue with the output board of the module, please replace the control board of the module.

1. Remove the metal shield on the back of the UPS screen, check the manufacturer and batch information on the back of the screen, and provide this information to the engineer for analysis.
2. ① If the screen manufacturer is XRD brand and the batch is before July 2023, the engineer will provide the screen upgrade program and method, and users can solve the screen frozen problem by upgrading the screen program.
② If the screen manufacturer is XRD brand and the batch is from July 2023 or later, or if the screen manufacturer is DWIN brand. Please power off the UPS then loosen the screen fixing screws slightly to prevent the plastic part from pressing against the screen and causing it to freeze. Restart the UPS and check if the screen is stuck.
3. If the screen still freezes after the above method, you can contact engineer to replace the screen.

1. Check if the parallel parameter settings of UPS are normal.
2. Check if the jumper cap on the parallel board of UPS is set according to the requirements.
3. Check which device in the parallel system has the alarm and replace the parallel cable for inspection.
4. If the UPS is three-phase input, check if the equipment is connected to the three-phase input source. If the single-phase input source is divided into three wires and connected to the equipment, it will cause three-phase imbalance in the equipment input, with current on the N wire, resulting in parallel failure.