dual z axis homing problem

Marco Bona

Hello,
I have a printer with two motors that drive the z axis mapped on drivers 8 and 9 of duex5. The limit switches are mapped to channels 8 and 9 of duex5.
During the homing of the z axis only one of the two motors works, instead all the motors work by moving the z axis up or down.
I tried to remap the motors0_1561222892539_config.g channels but the problem remains
Ideas?

I attach the config and home z file0_1561222900658_homez.g

SIam

hi,

if i understand it right you first assign Port 8 and 9 to Z-Axis after that you assign port 9 to U-Axis i think the U9 is here Wrong

M584 X0 Y1 Z8:9 U9 E3:4 P3

Marco Bona

I followed the instructions in this link :https://forum.e3d-online.com/threads/bigbox-dual-optical-z-max-endstops.2675/

SIam

and this macro does work ? or not ?

deckingman

@marco-bona Which firmware version are you using? Note that M574 which you are using to map end stops was introduced in a beta version but later withdrawn because it had some adverse effects. I believe it works in RRF 3 beta but not that latest stable RRF2. There was another recent thread about it here https://forum.duet3d.com/topic/10968/problem-with-m574

Marco Bona

I'm using the latest firmware 2.03.
Before it worked, then after the update it started to give problems.
So the problem is just the limit switch mapping?

dc42

@marco-bona said in dual z axis homing problem:

So the problem is just the limit switch mapping?

Yes. In these commands:

M574 Z2 C8 S0
M574 U2 C9 S0

the C parameters will be ignored. So the Z axis will use the Z endstop input, and the U axis will use the E0 endstop input. If that's a problem then you will need to install the RRF 3 beta firmware and read https://duet3d.dozuki.com/Wiki/RepRapFirmware_3_overview.

Marco Bona

The z and e0 inputs are already occupied, I try to install rrf3 and remap the limit switches.
Thanks

dc42

@marco-bona said in dual z axis homing problem:

The z and e0 inputs are already occupied, I try to install rrf3 and remap the limit switches.
Thanks

What are they occupied with?

Marco Bona

E0 and E1 for laser filament monitor, X and Y for X-Y limit switches and Z for an overtravel switch

dc42

You could connect the filament monitors to the two endstop inputs on the CONN_LCD connector.

Marco Bona

One is already occupied with the emergency button.
I have updated to RRF3 and the limit switches work correctly during Z homing