dual z axis homing problem

Marco Bona · 22 Jun 2019, 17:01

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 · 22 Jun 2019, 19:45

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 · 22 Jun 2019, 20:34

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

SIam · 22 Jun 2019, 21:11

and this macro does work ? or not ?

deckingman · 22 Jun 2019, 21:22

@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 Note that M574 which you are using to map end stops was introduced in a beta version but later withdrawn because it had some adverse effects.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 · 23 Jun 2019, 18:22

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 · 23 Jun 2019, 18:30

@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 · 23 Jun 2019, 18:48

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

dc42 · 23 Jun 2019, 19:20

@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 · 24 Jun 2019, 15:43

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

dc42 · 24 Jun 2019, 19:14

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

Marco Bona · 25 Jun 2019, 19:08

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