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Z axis contour monitoring

Created by: alexmac_uk at: 4/30/2011 5:11 PM (17 Replies)

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4/30/2011 5:11 PM	Rate (0)
alexmac_uk Posts: 118 Rating: (1)	Hi all, I am working on a cnc machine with two spindles, two x axis, two y axis, two z axis, two b axis and 2 c axis. Now for some reason when i remove emergency stop and press reset the Z1 axis is moving by around 10mm! and the Z2 axis is moving about 2mm. Both Z axis motors are on the same drive power module. I have changed over the control module with the y axis and the fault is still on the Z axis. I cant swap power modules because the Z axis one is 2x25amp and the others are 2x15amp. It seems like the power module is at fault. It is siemens 611U drives with a siemens 840D powerline control. Anything i can check?
alexmac_uk Posts: 118 Rating: (1)	Last edited by: alexmac_uk at: 4/30/2011 5:17 PM
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4/30/2011 5:27 PM	Rate (0)
Gebhardt Karl Platinum Expert Joined: 7/16/2006 Last visit: 1/2/2024 Posts: 1502 Rating: (176)	Hi Is the Z1 and Z2 an "hanging" axis ? Karl
	Karl
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4/30/2011 5:29 PM	Rate (0)
alexmac_uk Posts: 118 Rating: (1)	yes it is, vertical axis.
alexmac_uk Posts: 118 Rating: (1)
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5/1/2011 10:25 AM	Rate (0)
OvidiuNastac Silver Member Joined: 1/29/2008 Last visit: 7/26/2022 Posts: 419 Rating: (19)	Hi Because the Z axis is a "hanging" axis I assume that they have brakes. So the first thing you must check are the brakes. Either the motor brake or the power supply for the brakes. Good luck Nit

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5/1/2011 12:47 PM	Rate (0)
Gebhardt Karl Platinum Expert Joined: 7/16/2006 Last visit: 1/2/2024 Posts: 1502 Rating: (176)	Hi You must optimation the timing between Brake and Power-Unit. I think, you lose the breake, before the power-Unit is ready with energy. Do you have a other energy für the Z-axis. ( counterbalance --> Air, Hydraulik) If yes, please check for optimations Greating Karl
	Karl
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5/1/2011 12:50 PM	Rate (0)
Gebhardt Karl Platinum Expert Joined: 7/16/2006 Last visit: 1/2/2024 Posts: 1502 Rating: (176)	Hi I think, this is a commisioning ? Is it ? Karl
	Karl
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5/1/2011 2:23 PM	Rate (0)
alexmac_uk Posts: 118 Rating: (1)	Yes there is a brake on the axis, the brake is releasing when i press reset then energising again after a second or so. The motor shouldnt be moving unless i jog it manually. I did hear a noise at first on the Z1 motor like a loud vibrating noise. It seems like a new 2x25amp power module is required.
alexmac_uk Posts: 118 Rating: (1)
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5/1/2011 2:27 PM	Rate (0)
alexmac_uk Posts: 118 Rating: (1)	How do i check the optimations?
alexmac_uk Posts: 118 Rating: (1)
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5/1/2011 3:08 PM	Rate (0)
OvidiuNastac Silver Member Joined: 1/29/2008 Last visit: 7/26/2022 Posts: 419 Rating: (19)	alexmac_uk Yes there is a brake on the axis, the brake is releasing when i press reset then energising again after a second or so. The motor shouldnt be moving unless i jog it manually. I did hear a noise at first on the Z1 motor like a loud vibrating noise. It seems like a new 2x25amp power module is required. Hi I still think that your issue is with the brake. Maybe the brake isn't released at the right time and that's why you hear a noise (the motor enter in speed loop and it can't move the axis to the right point). Is the brake powered by the driver or from external source? Good luck Nit

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5/1/2011 3:36 PM	Rate (0)
Gebhardt Karl Platinum Expert Joined: 7/16/2006 Last visit: 1/2/2024 Posts: 1502 Rating: (176)	Hi Tell us about it, whether the machine has worked before? (So at least 3 months) Is it a re-programming or commissioning? is the feher Occurred only now? I mean, it's a standard machine? Karl
	Karl
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