On Fri, 2010-11-12 at 21:00 -0500, Peter Cauchy wrote: > Thanks for the help so far, and here is more info. > > If the parallel port is not putting out BTW 4 and 5v, I do not > understand how to increase this.
A breakout board like this one: http://www.cnc4pc.com/Store/osc/product_info.php?cPath=33&products_id=45 has buffer chips on it that will use the low voltage or low current signals from the parallel port, then amplifies them to 5 Volts and up to 24 milliamps. The chip is a 74ACT245: http://www.fairchildsemi.com/ds/74/74ACT245.pdf If you look on page 5, in the table DC Electrical Characteristics for ACT, the first line says Vih, Minimum High Level Input Voltage, Typ. 1.5 V; and Vil, Maximum Low Level Input Voltage, Typ. 1.5 V. This means, typically anything in an input that is higher than 1.5 Volts will be output as a High, anything lower will be ouput as a Low. The typical output voltages are just below, with High being 4.5 Volts and Low being .001 Volts, typically. So the input transition point is in the middle for 3 Volt signals, but also high enough to work with 5 Volts signals too. The 4.5 Volt high buffer output is higher than the 4 Volts what your driver will consider a high input, so the buffer or breakout board should work fine. Also the Slo-syn manual (page 13) says that a low on an input will draw 16 milliamps. Parallel ports may only supply a few milliamps. The buffer chip above supplies 24 milliamps per output, so your okay here too. You can wire up your own buffer circuit board or use a store bought one like the one above. > I am running the OPTO off the USB 5v supply. The parallel port, USB and > motor supply ground are all tied together. The USB 5v is tied to OPTO. > Pin 7 on parallel port is tied to DIR and pin 8 to PULSE. The other > inputs are left unconnected. This should work for now. You can use AWO and RCDE later. > I have 3 other drives that this setup works with fine, but not with > these ss2000md7's. It is not clear to me, from the manual, how the driver is powered. My current thinking is that the typical driver has two separate sections, one for logic and the other the motor control. They have two separate power inputs and separate grounds, but with the Slo-syn the motor power supply is the only power input that is indicated. The motor supply is unregulated and the motor supply voltage needs to match the motor specifications (24 to 75 Volts), so it seems it would be difficult to get a regulated logic supply from it. Hopefully someone here can enlighten me. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Centralized Desktop Delivery: Dell and VMware Reference Architecture Simplifying enterprise desktop deployment and management using Dell EqualLogic storage and VMware View: A highly scalable, end-to-end client virtualization framework. Read more! http://p.sf.net/sfu/dell-eql-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
