How to handle the password lock of VFD-E Delta VFD converter?

I helped a friend debug a Delta VFD-E frequency converter on site, but due to a damaged panel, I couldn’t operate it after purchasing a panel provided by a friend. This friend went to the site and adjusted it all morning, but the frequency converter still couldn’t run. When I arrived at the site, I found that the parameters couldn’t be changed. The machine parameters 00.08 and 00.09 are for protecting password input and protection password setting, respectively. When the 00.09 parameter is assigned a value of 1, it indicates that the parameter has been locked by divisor. The correct password needs to be entered from parameter 0.08. After the value in parameter 00.09 becomes 0, all parameters can be operated. However, before changing the panel, the machine is said to be functional. In theory, You can use it by replacing the good panel. It’s impossible to set the password on your own after replacing the panel. Someone must have accidentally changed the 00.08 parameter! I don’t know the password! The factory personnel called to inquire about multiple people, but I’m not sure if there’s anything else they can do. Should we withdraw now? The machine is not running yet. It cannot be produced. We need to try to make the machine run. Although the parameters cannot be modified, they can be called up for monitoring. Therefore, we can call up parameters 02-00 and 02-21, which are frequency commands and operation commands. Both parameters have a value of 1, which is controlled by terminal start/stop and external potentiometer. The start/stop of the machine was originally wired through terminals, and a torsion switch has been connected to terminals M11 and DCM for starting, Stop the control. Find a 1k potentiometer, connect terminals+10VAV1 and ACM, power on and test the machine. The machine is running! The manufacturer’s personnel are very happy and eager to ship. The operators also feel that using a potentiometer for speed regulation is even more convenient than panel speed regulation.

After multiple efforts, we finally obtained the super password for this frequency converter. Parameter 008 is a password item, and entering the 8333 super password can unlock it. If you encounter similar problems in the future, you can unlock it through the super password and then operate it without changing the control method to complete the task.