On 2015-01-16 04:40, Kirk Wallace wrote: > I just received one of these (2.5 weeks from China) as a possible > replacement for my unipolar driver that keeps blowing out transistors: > http://www.ebay.com/itm/331393094727 > > The original drivers run at 45V and 8 amps, with NEMA42 motors with 2.5 > Ohms per coil. The new driver can run at somewhere around 100V and 7.2 > amps and the motor is wired for 5 Ohms bipolar. I did a brief test at > 50V and a setting of 5 amps (1/4 stepping), with the sample stepper > config, and so far so good. The original drivers make the motors sing, > but this one is silent (except for the steps). There are no specs on the > signal timing, so I'll need to play with this, as well as try the > maximum amp setting at 7.2, and upping the voltage to 100V. I may need > to get more to do Y and Z. > > If anyone has used these drivers with NEMA42 motors and has any addition > information or advise, please let me know. > > One thing that comes to mind. I looks like there is no overload > protection, such as a power input fuse or breaker. It would seem prudent > to add a fuse. I use similar drives all the time and I put 110vdc on a 80vdc drive the other week. I thought that the drives was cooked but when I tested it with the correct voltage it was fine. It seems that hey have an input current and voltage sensing circuit and will not damage easily. Most of these drive originate from the same factory and my exerience with them has been very good. Some of them does have a fuse on the pcb. I did break one drive when I unplugged the motor while the drive was still under power.
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