Alpha wrote: > > The servo is a Japan Servo > ESA-1N-S > 1.0 W > 100/100 volt > 50/60 hz > 2p > 1.5/1.2 uf This is a 2-phase AC induction motor. They most likely feed a phase-shifted AC waveform to one phase of the motor, with a 1.2 uF capacitor. The other phase is powered by some kind of amplifier that produces a 60 Hz waveform that is either in phase or 180 degrees out of phase with the AC line. Magnitude of the voltage roughly controls the motor torque. Phase controls the direction. If both phases are being supplied to the motor, then the motor likely has a bad winding. If the two phases are in synch without a phase lag, the phase shift capacitor is shorted. If the servo amp is not providing a good output, then the motor might work intermittently.
Yes, the pot certainly could be bad. Might just check from end to end, it should have some nominal resistance reading, like 1 K Ohm, 10 K Ohm or so. If it reads open circuit, it is likely bad. If the full resistance reads OK, then check from one end to the slider. It may have a good section and a place where it goes open circuit. Jon ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
