Created Date: June 16,2008

Created by: blglaw

milldrone

This is exactly what i am talking about and what i need. I however have much of the system in place already, i just need to put the encoder to it for measuring and a control to start and stop the pulling motor. My biggest question is whether or not i will require the H0-CTRIO module for my quadrature encoder? I am pulling about the speed of what Paula's was and my encoder is a 1200 PPR with a 12 " circumference wheel (3-3/4 " Diameter). I don't think i need it, but it doesn't hurt to ask. Thanks for the link, boy that was a lot of reading, but very educational. http://forum1.automationdirect.com/board/smile.gif

Created Date: June 17,2008

Created by: milldrone

Rich and blglaw,

When I run the numbers, I get 4.16 feet per second or 250 feet per minute with the 1200 PPR and 12 " circumference. Using the 5K hz limitation.

If you remember from the thread-saga she had to use a creep mode to home in on the setpoint. This is where I believe your challenge will be.

Vaughn

Created Date: June 17,2008

Created by: blglaw

ok....thanks Rich and Vaughn. I think i will go with the 06 then as it has a 7K Hz range. I do agree that my challenge is going to be able to stop the material. My puller works great and the material runs into a limit switch that shuts off the motor. The motor is controlled via a Dayton DC motor contol with speed control pot on it. I think i might be able to get a different controller that i can control with the PLC and get down to the creeping speed that i need. We are not pulling very fast as the material is going through a centrifical straightener, the puller, and then we cut it off with an abrasive cut0off saw manually.

Created Date: June 17,2008

Created by: milldrone

blglaw,

So from what you have posted I'm presuming that you have a 120V system, with existing gear that sort of works.

Let me plant a seed! The VFD's AD sells come in a 120volt single phase input 240volt three phase output. Check out the first three items on this page. http://w eb6.automationdirect.com/adc/Shopping/Catalog/AC_Drives/GS2_(115_-z-_230_-z-_460_-z-_575_VAC_V-z-Hz_Control)/GS2_Drive_Units_(115_-z-_230_-z-_460_-z-_575_VAC)

If my guess is correct the price of these is about the same as your dayton controller.

The AD VFD is much easier to interface with the PLC. You can get the VFD to accell and then decell so you can have a soft stop (no limit switch).

PS. In almost every application I have done with a DL05, I have regretted not using a DL06 in the first place. Not that the DL05 is a bad choice, it's that the DL06 has all the bells and whistles. Full instruction set, much more flexible second com port.

Vaughn

Created Date: June 17,2008

Created by: blglaw

Thanks. I will take a look at it. My motor is a Dayon SH563 and current controller is 4Z527. i am not married to the controller, but the motor i am. Here is the motor description "Gearmotor,71 RPM,90vdc

Parallel Shaft 90 VDC Gearmotor, Nameplate Speed 71 RPM, Input Power 1/10 HP, Gear Ratio 25:1, Overhung Load 230 Pounds, Full Load Torque 83 Inch Pounds " from WW Grainger. I have to keep production going while i get this up and running. Thanks for the information.

Created Date: June 17,2008

Created by: milldrone

blglaw,

i am not married to the controller, but the motor i am

I'm refraining from any marriage jokes.

If you can't change the motor, then you will still need a similar controller. One of the problems with these types of controllers is that the speed reference is not isolated from the line voltage (bad for the PLC). If you desire to change speeds from the PLC you have two options.

1. Analog card approx $149 + analog isolator approx $89.

2. Several speed pots that you switch in and out of the circuit via isolating relays that are controlled by the PLC. Some of these controllers are sensitive to what you can do with the speed reference end of the control. I don't have any experience with the controller you are using.

Will you be measuring the product directly with an idling measuring wheel? (good) Or will you be measuring the product via the drive rolls? (bad)

Does your controller have a ramping stop and start? Does it also have a "hard " stop option?

Vaughn

Created Date: June 17,2008

Created by: blglaw

No...It is only an adjustable speed controller. It does have MOV transient and surge protection and a fixed acceleration control (1-3sec soft start). It does have a pot that i could remove and replace with three preset resistors or something to give me a fast/med/slow speed control. I am going to look around first for a controller that can do this already and will interface easily to the PLC.