JB52

From one inveterate tinkerer to another then...... Just getting started, the pic shows merely that I've installed a SPDT switch to switch from foot control to PC control, and a jack to receive the PC generated speed signal (the optocoupler input). It is quite fortunate the servo amp supplies +5VDC to drive the hall effect switch mounted there on the PCB under that pivot arm which has a fairly stron magnet at it's end. So, that +5VDC and it's 'ground' (which sits at 160 VDC above PE (Protective Earth) potential, and carries a 120 VAC 'ripple'). I've not tried yet to float an Oscope to see what this 120VAC component actually looks like. But the +5VDC is a nice clean logic supply with respect to it's 'ground'. I'm going to call that UG, short for Ugly Ground. Anyway, this +5VDC and UG can be used nicely to bias the output of an opto-coupler. A little R-C integrator formed at the opto-coupler output, and driven PWM style from the opto-coupler input will work.......with a little tinkering. ;-) Will keep you posted if you like. Actually, very customized speed controls for these machines are not that difficult, even an Arduino based fancy control panel is possible. There will ultimately be a feedback signal from the spindle to map a sort of lookup table of function to get the speeds I want more exactly. Ciao, JB_52 -John

Thanks Tor, I already bought a CSM1000. Seems a solid enough motor. I'm not using it for sewing, rather, I'm using it on a Swiss lathe for watchmaking. Schaublin 70. My inquiry was to attempt to find schematics for the CSM1000 to design a PC interface for speed control, but schematics are very difficult to find these days. I resorted to probing with an isolated DVM at the footpedal, and devised a way to drive the CSM1000 servo from a PC. This requires electrical isolation, as the hall effect sensor in the foot pedal sits at 160 VDC above PE (Protective Earth) ground, AND it carries 120 VAC. NOTE: The foot pedal DOES NOT carry a PE ground wire up to it's case, so if the pedal is mounted to a wooden (insulated) bench and the footpedal control fails.....the operator is in for an unpleasant shock at least, particularly if they are in bare feet! I strongly reccommend that users of any of these motors make their own PE ground wire connection in order to conform to reasonable safety precautions such as those embodied in UL or CE directives. This is easy and involves only making reliable connections (preferably with using green/yellow stripe wire) from the foot pedal itself, up to the foot pedal control box, and back to the servo amplifier. The motor frame should also have such a PE ground, and it does on this particular model. All this can be easily 'beeped out' with a DVM. Anyway, I'm solving my control problem with a simple PWM/opto-coupler interface. Schematic from the manufacturer notwithstanding. ;-) Regards, John B

Looking through Ho Hsing's models under products here: http://www.globalsew.com/en/en/sales-contacts-ho-hsing doesn't show anything which looks like the CSM1000. Of course the CSM1000 might be an OEM motor made to Consew's specs. One of the Ho Hsing motors looks like the CSM1000 motor, but none of the controllers are close. I think Consew is buying the motor from the same place as Ho Hsing, and the Consew controller is perhaps subcontracted. Who knows these days? The control for the foot pedal is actually working pretty smoothly, the lever isn't meant to be run by hand and that's why I originally thought it was 'touchey'. There's a sort of hall effect sensor inside the foot control interface that feeds back approximately 0-5V to the servo amp. Far more reliable than a potentiometer there. And at least I can insert an interface to give me PC control of forward rotation speed. There are two 'extra' plugs, one is for the needs synchronizer, the other is still a mystery. Here's a link to it: http://www.consew.com/View/Consew-Model-CSM1000 though the controller looks just slightly different somehow. I'll have to post a pic. If this rings a bell with anyone.....the origin of this controller.........please give a shout. Thank You, JB52

Thanks Tor! I'll get logged on to HohSing and see if I can relate the consew CSM1000 to the correct Hohsing series. I don't have the servo motor bolted on yet, but the bench tests are pretty promising. I paid only $120, but without the needle positioner......looking at this motor and drive, I think it's a really good value. -Regards, John

Hello All, I'm a little late here, but I just bought a Consew CSM1000, and aside from the touchey foot pedal, I like it so far. I'm an electronics/mechanical tinker to be sure, and will be hacking at it until it works the way I want. Which also means that if I can get a schematic, or more informatin about the main control board (or at least those two extra plugs on the controller) that it may be feasible to make a 'hack' to get better front panel controls. My ultimate goal is to get PC control of speed and direction. So to make a long story short.......does anyone know the Chinese manufacturer of these servo drives? Consew just re-brands them, and I'll try to get more information from Consew, but I'm a little pessimistic about that. Thanks All, and Regards, John p.s. I've already had the thing all apart, and it would be an easy modification to have switches in the pedal control box to set pedal sensitivity. If anyone is interested, I'll prototype and document the mods.