Support

The DA200A driver operates normally during startup. However, an Er25-c error occurs when the stop command is issued.

A: P0.76 is set to 0 to disable it. This is the case for all other models, including DA200A-E/C/N. The short circuit detection reporting mechanism has been optimized. Short circuit detection is now performed once per power-on or soft reset instead of every time the detection is enabled. The 1.05 version software has been optimized.

Parameter P02.17 is the number of pole pairs in the motor parameters. You first need to check the motor information to determine the number of magnetic poles on the motor rotor. However, the number of magnetic poles is not the same as the number of pole pairs. The number of pole pairs represents how many pairs of "N-S" poles there are. Therefore, the number of pole pairs equals the number of magnetic poles divided by 2.

Example: If the number of magnetic poles is 10, then the number of pole pairs is 5.

If power is supplied to the drive to put it in standby mode, and then an external power source is connected to its output terminals (U/V/W), what will happen?

A: This is a strictly prohibited operation. It will cause a serious fault and will immediately damage the drive. The most direct consequence is the burnout of the inverter module (IGBT) inside the drive and its driver circuit. Therefore, it is forbidden to connect any commercial power source (or any voltage source) directly to the U/V/W output terminals of the drive.

The GD20 frequency converter reports an ItE fault. The customer measured the diode voltage drop of the main circuit and the inverter circuit using a multimeter, and found that it was normal. The IGBT power module was intact and there was no breakdown or short circuit problem. After powering the frequency converter alone, the device immediately triggered the ItE current detection fault alarm. After replacing the brand-new control board, the ItE fault was eliminated, and the three-phase output of the frequency converter was restored and operating normally. When encountering an ItE fault, the following steps can be followed for investigation and repair:

1. Check the connection status of the wiring between the control board and the driver board, and re-plug to confirm the reliability of the contact

2. Confirm that the phase sequence of the Hall cables U/V/W is completely matched with the phase sequence on the driver side; check that the Hall pins are not offset and are securely plugged; if there are no abnormalities, directly replace the Hall sensor for testing

3. Disconnect the power line of the motor on the frequency converter side, and power on the frequency converter alone. If no more faults are reported, it is determined to be a problem on the motor/lower load side

4. Replace the intact driver board for verification

5. Replace the intact control board for verification

 Troubleshooting steps:

1. Loose wiring of the low water level switch. Check the low water level switch wiring – one end should be connected to the main control board port J26‑DI6, and the other end to the terminal block 24V.

2. Obstruction near the water level switch causing false alarm. Clear the obstruction.

3. Faulty low water level switch. Replace the low water level switch.

4. Clogged or faulty water inlet valve of the wet film humidifier. Clean or replace the wet film humidifier water inlet valve.

Troubleshooting steps:
1. This alarm occurs when the actual supply‑return air temperature difference of the unit is less than the "supply‑return air temperature difference threshold".

2. At this point, check the actual difference between the supply air temperature and the return air temperature. If the difference is indeed below the threshold, it is a normal alarm. You can check the supply and return water temperatures, then adjust the threshold to clear the alarm.

3. If, after inspection, the supply‑return air temperature difference is confirmed to be greater than the alarm threshold, you need to provide the alarm history and software version number, and contact the manufacturer for further handling.

Main reasons analysis:
1. During operation, the inverter generates harmonic currents, which cause distortion in the voltage waveform and interfere with electronic equipment.
2. Since the load voltage is pulsed form and the current absorbed by the frequency converter from the power grid is also in a pulsed form., it contains a large amount of high-frequency components, which will form radio frequency interference and cause interference to devices using the same power grid.
3. There will be radio frequency interference currents on both the input and output cables of the inverter, generating magnetic wave radiation and thus causing interference. This interference will have a serious impact on electronic equipment when it is close to the inverter.
A: 
(1) Grounding: Connect the inverter to the control cabinet and the motor's casing together for grounding to absorb surge interference.
(2) Filtering: Add filters at the input or output ports of the inverter to effectively reduce high-order harmonics.
(3) Shielding: Wrap the cables and equipment with shielding materials, separate the power lines, signal lines and control lines of the frequency converter for wiring, avoid parallel laying, and reduce electromagnetic coupling to lower the radiation of electromagnetic waves.
(4) Isolation: Use isolation transformers, optocouplers, etc. between the frequency converter and external equipment to achieve electromagnetic isolation. The isolation transformer can effectively isolate the electrical connection between the frequency converter and the power grid, reducing the transmission of high-frequency interference. The optocoupler is used to isolate control signals and prevent interference signals from entering the control system. For example, using an optocoupler connection between the frequency converter and the PLC can enhance the system's anti-interference capability.
(5) Adjusting parameters: By adjusting the carrier frequency of the inverter, reduce electromagnetic interference.

1. First, place any two modules into the cabinet for testing to check if there are still alarms. If alarms still occur, it is recommended to check the cabinet backboard and wiring and replace the bypass module monitoring board.

2. If the alarm persists after the replacement of the aforementioned components, it is possible that there is an issue with the module control board. It is recommended to replace the control board and then conduct another test.

1. Hardware Check: 
① Verify if the EPO button or dry contacts have been manually operated; 
② Check if J4-1 and J4-2 on the dry contact board are shorted, and whether the shorting caps are loose or fallen off; 
③ Check if the EPO button is working properly, whether it is stuck, or if it malfunctions when pressed.

2. Software Check: Connect to the MTR software, find "ServSetting" - "Customization" - "CustomCode"; 
① Check the "LocalEpoDisable" function. If the alarm disappears, it indicates the dry contact board is damaged; 
② Check the "RemoteEpoDisable" function. If the alarm disappears, it indicates the button board is damaged;
③ If all of the above are disabled and the alarm does not disappear, it indicates the monitoring board or control board is damaged.