Analog disconnected protection in AC10 FW3.32 does not work

Hello Jack,

Thank you for the quick answer. Yes, I realize that AC10 frame sizes are firmware dependent. Maybe I was not clear enough. I compared the Analog disconnected protection behavior on two drives. Drive 10G-41-0015-BN, FW 2.31 and drive 10G-46-0600-BN, FW3.32. Since our company is Parker distributor, I have different frame sizes on the stock ;)

What we observe is that AC10 with FW2.31 behaves exactly as explained in the user manual: When we set F741=1, (we are using current input AI2, F406=2) and analog input signal drops below 2mA (F742=50%) drive stops with AErr displayed. Thats fine.

But, doing the same with higher frame size AC10, FW3.32, even when analog current input signal drops to 0mA, drive continues to run and nothing happens, which is quite inconvenient, especially if the drive is controlled by the current sensor, won't you agree?  

I appreciate your help very much.

Dusan,

A couple of things to check for.  

When your AI2 is set to 0, what is F332?  F332 is the value that the AC10 thinks AI2 is.  F332 should report a value between 0 and 4096, where 0 = 0V and 4096 = 10V.  If F332 is is not 0 or really close to 0, then it may be an issue with analog offset.  Those can be adjust with the corresponding settings.

What do you have for F406-F411 and F419?

Also are you using the same motor for the 10G-41 and the 10G-46?  That is a really large difference and the AC10 series does not work well with a motor is the either too big or too small.  Usually it is expectable to go up or down 1 frame size.  More than a 1 frame size difference, it can have unexpected results.

Hello Wiliam,

Thanks for the answer. I just checked, here are the parameters:

F406=2.00, F407=1.00, F408=10.00, F409=2.00, F410=1.0, F411=0.10, F419=0.0

When AI2 is set to 0, F332=0, so most likely it is not an offset issue, but it occurred to me if you suggest we must have motor connected for this feature to work, that could be the solution. Because, I tested it on both inverters without motor connected. For the smaller drive 10G-41, it works great regardless of whether inverter is in running or stop state. 

Unfortunately I do not have 30KW motor in the office to test larger drive 10G-46 with motor connected. So if you can confirm that it is mandatory to have motor connected for Analog disconnected protection to work, than we may consider this topic solved.

I am very grateful for your support.