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Mechanical cam timer

Created by: GPSP at: 3/24/2014 10:55 AM (4 Replies)

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3/24/2014 10:55 AM	Rate (0)
GPSP Member Joined: 3/24/2014 Last visit: 10/17/2019 Posts: 15 Rating: (0)	Good morning, I am after some help please on replicating a mechanical cam timer in Siemens Logo! The cam revolution is 2 seconds, I then need to be able to programme various on/off points during this revoution of the cam. Then at the end of the 2 second revolution the time needs to reset. I have various timers to replicate, some having 12 cams some 6 and 4 cams. I have the degrees that the switches are activated so can convert this to seconds. Attched is one of the tables for a cam timer showing the cam switching positions. Thanks for your help Dan Attachment 005.jpg (347 Downloads)

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3/24/2014 12:18 PM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, If precision of the timing is not a must, you could us an Asynchronous pulse generator as a time base for various counters. You can set the timing with the on/off parameters in the counterproperties. regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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3/24/2014 12:41 PM	Rate (0)
GPSP Member Joined: 3/24/2014 Last visit: 10/17/2019 Posts: 15 Rating: (0)	I believe the timings are critcal, as all the cam timers work together to control the program cycle. I was thinking of timer with a setable coil on voltage, then programable contacts if there is such a thing.

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3/25/2014 9:40 AM	Rate (0)
Toeternietoe Platinum Member Joined: 12/27/2006 Last visit: 11/17/2025 Posts: 1200 Rating: (116)	Something like in the attachment. You can edit as you wish up to a max of 16 Output Yoiu can also connect an output to 2 or more cams by using OR gates Attachment Cam.zip (345 Downloads)

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3/30/2014 7:14 PM	Rate (0)
GPSP Member Joined: 3/24/2014 Last visit: 10/17/2019 Posts: 15 Rating: (0)	Thanks for that, it looks like it will do what I need. One further problem though the cam timer will be controlled by a scrambler timer which will start/stop the cam timer at differing times. Is there a way to keep the times in the timers. Imagine the mechanical cam timer, if poer is taken off the motor the cams will stop turning, when power is re-applied the cams will start from where they stopped. I need some kind of retentivity but I think it only applies if you power off logo!, I need it to hold time if you take poer of the trigger input on a timer. Thanks

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