Labview Thorlabs APT DC servo controller "Homing" process

[Bowxx]

Hi,

I'm having a problem with developing Labview software for Thorlabs APT DC servo controller(ActiveX). When I first run the program, using the interface to home the motor, once I hit "Home/Zero" button, the motor lost control and continue rotating to one direction and the Labview program stops responding. I tried many times and it's always the case. I'm wondering if there's a way to customize the homing process? I tried "GetHomParam" in ActiveX but it didn't seem to work. Thank you!

[JustJohn]

Hello Bowxx,

Does the homing process require some kind of digital input or limit switch to be triggered during this perpetual rotation? Typically a homing maneuver will move the motor as far as it need to until a specific limit switch is hit which defines the motor as "homed." Could you expand a bit more on your system? How are you communicating with this servo controller? Are limit switches a viable option with this system?

[heidil]

I have a very similar or the same problem.

I seem to have difficulties homing my linear motorized stage. It tends to go past the "home" position and then get stuck at a negative position value (e.g. -2.1 mm).

Did you ever figure out how to fix this???

[Brian.D]

Is the negative position consistent (i.e. when you "home", does it always move to -2.1mm)? Are you using a limit switch and targeting that position?

Without knowing too much about Thorlabs' software implementation, I would recommend contacting them or providing more information about their commands.