10/30/2008 2:47 AM | |
Posts: 32 Rating: (0) |
Dear JensS, We want to promote our product MM440 in centrifuge machine. SD products, such as MM440, G120, etc., the max start-up time is 650 seconds. But the requirment of centrifuge machine is 1300 seconds. So have we methods about MM440 to solve this problem? We've tested two methods: The first one is to divide two speed areas 0-25Hz ,25-50Hz, and to switch two DDS.(because the parmeter P1080 belongs to DDS). But failed. The second one is to use two RFG: 650s stardard RFG, and 650s PID RFG in series. But The time is not 1300s.Failed either. Do you have new minds to solve this problem?. |
11/10/2008 6:52 PM | |
Joined: 3/27/2008 Last visit: 9/26/2024 Posts: 1136 Rating: (142) |
Hi Billing, I have created a configuration using timers and function blocks within a Micromaster MM440.I will draw this up but at this time unable do this at this time due toother jobs. This is created in a small Micromaster MM440, 230V, 1 phase, 120Watt. Digital inputs: DIN1/ Enable, starting the pulses from two timers. DIN2/ OFF two, DIN3/ Start momentary contact DIN4/ Stop momentart contact Operation: switchDIN 1 on and DIN 2 on press din3 and the motor will run acellerating very slowly press din4 motor slows down. Pulses from the timer circuit pulse the MOP up and MOP down to acellerate the load. The drive switches off using P2155 and P2150, frequency threshold removing the run command , but to start a timer latch 'Timer 3' set to 90 seconds allows the motor to exceed the threshold. Check the timers T1 (on delay) and T2 (pulse putput) to ensure the timing is ok for the application. Centrifuge manufacturers become very nervous operating from VSD's so check this out first on a small motor, to ensure the timing an configuration is adequate and 'Safe'. Good Luck........ I have now attached a drawing for the Long Ramp configuration AttachmentLong_r_2.zip (190 Downloads) |
Last edited by: tractor at: 11/14/2008 6:08 PMLast edited by: tractor at: 11/14/2008 6:07 PMTractor |
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11/17/2008 1:57 PM | |
Joined: 3/27/2008 Last visit: 9/26/2024 Posts: 1136 Rating: (142) |
This is the final file, this is archived within STARTER, to retrieve this upload this file and in STARTER select Project, Retrieve From Archive.
AttachmentLong_ram.zip (181 Downloads) |
Tractor |
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5/31/2009 7:43 AM | |
Posts: 32 Rating: (0) |
Thanks, tractor |
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