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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.

1. When the after-sales personnel are maintaining the HT33040XL and DT3340XL machines, if they find that the board on the machine is defective, the board code is 17001-02182, the inverter busbar safety board. They should pay more attention to these positions: whether the U5 optocoupler, R11, R12, R7, R30, D27, D28, etc. are corroded, because this board is in the air outlet, it is easy to corrode. See the picture.

2. If corrosion is found, please note in the shipping list that these positions should be covered with white glue for protection. White glue code: 39002-00030

Fixative adhesive: hot melt adhesive strip: softening point: about 105℃ + 5℃: viscosity: 180℃ / 16000CPS: milk white: 8811A: ROHS: R.

1. Connect the equipment to the MTR software and make changes to the maintenance period of the power module's capacitors/fans in the "Service Settings" -> "System Settings".

2. Users can use the V1.98C version of the MTR software. In the controlCmd function (password: 12345678) -> Module Operation Command Menu, select the corresponding module and clear the working time of the electrolytic capacitors/fans in the power module.

Q: The DC fan inside the UPS I purchased from your company has recently started making abnormal noise. What is the reason?
A: The main causes are either the fan speed level has been set to Level 2 via the MTR software, or one or more DC fans inside the UPS have malfunctioned.

Q: However, there is no fan fault alarm code displayed on the UPS. How can this be explained?
A: In some cases, the "Fan Fault" alarm has been disabled via the MTR software, which is why the code is not shown.

Q: How can I resolve the fan abnormal noise issue?
A: Please follow the solutions below:
1.Connect to the UPS using MTR software and configure the parameters as follows:
1）Path 1: ServSetting → System Setting → 3-level Fan Speed Control → Select Enable
Note: If set to Disable, fan speed will increase significantly, resulting in louder noise.
2）Path 2: Rated Setting → System Code Setting 1 → Check FanFailBzOnEn → Restart the equipment.
After rebooting, check if fault code 53 (fan fault code) appears on the UPS screen.
Note: If a fan fault or code 53 occurs, the fan will run at maximum speed, causing increased noise.

Summary:If 3-level fan speed is enabled and fan fault alarm is checked, the fan will operate at the lowest speed level and noise under normal working conditions.

FAQs for Abnormal Noise from DC Fan
Applicable Equipment Models: HTX 06–20KVA

Q: The DC fan inside the UPS I purchased from your company has recently started making abnormal noise. What is the reason?
A: The main causes are either the fan speed level has been set to Level 2 via the MTR software, or one or more DC fans inside the UPS have malfunctioned.

Q: However, there is no fan fault alarm code displayed on the UPS. How can this be explained?
A: In some cases, the "Fan Fault" alarm has been disabled via the MTR software, which is why the code is not shown.

Q: How can I resolve the fan abnormal noise issue?
A: Please follow the solutions below:
1.Connect to the UPS using MTR software and configure the parameters as follows:
1）Path 1: ServSetting → System Setting → 3-level Fan Speed Control → Select Enable
Note: If set to Disable, fan speed will increase significantly, resulting in louder noise.
2）Path 2: Rated Setting → System Code Setting 1 → Check FanFailBzOnEn → Restart the equipment.
After rebooting, check if fault code 53 (fan fault code) appears on the UPS screen.
Note: If a fan fault or code 53 occurs, the fan will run at maximum speed, causing increased noise.

Summary:If 3-level fan speed is enabled and fan fault alarm is checked, the fan will operate at the lowest speed level and noise under normal working conditions.

Switch to English by opening the software in administrator mode. If this does not resolve the issue, please contact the INVT engineer. Email address: support@invt.com.cn   

Add New relay function P06.00~P06.21 = 92: MV switch-on allowed
+ Operational logic:
IF (Control power on = true) 
AND (VFD fault = false)
AND (Emergency stop button off = true)
THEN
    Relay output := 1;
ELSE
    Relay output := 0;
In  MVD ARM Software V3.08, a feature has been added that allows the system to automatically issue a closing command.