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I have mm420 and want to make my motor running at two speeds

1/2/2011 11:25 AM	Rate (0)
rza Posts: 3 Rating: (0)	hello, I have mm420 and want to make my motor running at two speeds, for water treatment dosing purpose. I have try to set low speed and max; speed but it cannot change the freq: i have only option to to give analog input from potentiometer but it deos not solve my problem. can any one please tell me how to set proper two frequency settings, which changing in timely manner. ie: 8Hz for 20 min: and after 20min: motor runs at 32Hz.
rza Posts: 3 Rating: (0)	Last edited by: CS Moderator at: 1/3/2011 11:26 AM new subject after splitting
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1/2/2011 11:26 AM	Rate (0)
rza Posts: 3 Rating: (0)	Two sped settings for mm420
rza Posts: 3 Rating: (0)
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1/7/2011 2:27 AM	Rate (0)
nulizhang Platinum Member Joined: 10/17/2007 Last visit: 1/19/2026 Posts: 4579 Rating: (416)	hi,rza, i did not respose for your post, (i aready inform Moderators). but i did not know why my post is coming to here. howevery when i have time i will give you some help.maybe in next week. you can download manual from Siemens web.(MM420), checking fixed frenquce fuction. BR
	If you like my comments please use "Thank" bottom left or Rating Top right
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1/13/2011 2:22 AM	Rate (0)
nulizhang Platinum Member Joined: 10/17/2007 Last visit: 1/19/2026 Posts: 4579 Rating: (416)	if you still need help? respose to this post. or you can check MM420 manual by youself.
	If you like my comments please use "Thank" bottom left or Rating Top right
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1/17/2011 8:06 AM	Rate (0)
rza Posts: 3 Rating: (0)	okay, i am waiting for your reply.
rza Posts: 3 Rating: (0)
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1/18/2011 4:36 PM	Rate (0)
JensS Posts: 739 Rating: (55)	use two Fixed frequency (e.g. P1001 / P1002) see parameter list: http://support.automation.siemens.com/WW/view/en/24525275 to changing it automaticaly (e.g. 20min), use a external timer.
JensS Posts: 739 Rating: (55)	Last edited by: JensS at: 1/18/2011 4:38 PM
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1/19/2011 12:24 PM	Rate (0)
joher Posts: 22 Rating: (0)	Hello rza, u r writing that u can give only AI. May i know how start command u r giving?
joher Posts: 22 Rating: (0)
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1/20/2011 5:57 PM	Rate (0)
Tractor Gold Expert Joined: 3/27/2008 Last visit: 1/18/2026 Posts: 1236 Rating: (149)	P0700 = 2, terminal control P0701 = 16, select fixed frequency & ON P0702 = 16, select fixed frequency & ON P1000 = 3, select fixed frequencies. P1001 = 25Hz P1002 = 35Hz This will produce two speeds, however there is no timing in the MM420, so this will have to be provided by an external circuit.
	Tractor
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