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To specifically answer your question, yes, encoder pulses can be lost and not result in an axis fault. If the "Motor Feedback Noise" fault action is set to "Status only", rather than "Disable Drive", and noise is present with your encoder signals, pulses could be lost resulting in positional...

If the scaling is correct and electrically, things seem sound, I would take a wrench to the motor couplings to make sure things are not slipping. Also, if the moves are pretty aggressive, belt slippage (timing belt jumping a cog) is a distinct possibility.

With most "typical" dc coil applications (< 1amp) I've encountered, a diode is connected across the coil (directly to the supply) to absorb the surge when the coil is de-energized. I ran across an application where DC power was being switched (both + & -) through another relay. The diode was...

From looking at the contacts,(which were now laying on the bottom of the enclosure)looks like they were welded for a short time before they blew off. So I'm thinking the contactor itself was OK.

I have a 50 HP 3-phase, 460VAC motor circuit that experienced a fault. The motor is operated by an across-the-line starter. (I didn't realized motor starters had so much smoke compacted into them!). A megger test did not show any difference in the windings or wiring to the motor so the motor...

My thoughts about oversizing the contactor was that if the motor stalls, the contactor opens at locked rotor current. If the jam is significant, when the motor reverses, it could potentially still be jammed and now the reversing portion of the contactor opens and is subjected to this high...

Thanks all for the advice. jraef, regarding your first comment, I'm not totally clear on what your getting at here. Is the concern that on a low level current trip, the motor may still be spinning forward when the contactor reverses?

I am looking at a grinding system that occasionaly gets jammed and stalls the motor (100 hp, 3-phase, 460VAC). The thought is to monitor the current in one of the motor legs, upon sensing an over current condition, stopping the motor, reversing the direction to clear the jam, stopping the motor...

Thanks cuky2000, I'll take your advice.

Many of the specifications (Hevi-Duty, Acme) I have looked at specifically say 60 Hz operation only. However, postings on this site indicate that if the input voltage is reduced by 5/6, it is perfectly fine to use them at 50 Hz. Theoretically , it is plausible but are there any other things to...

All, The main piece of equipment will be powered by 440V. This piece of equipment will only operate at one of the stated voltages and requires roughly a 90amp service. When looking at the 60hz specifications, do I only need to worry about input voltage de-rating since I am operating at 50 hz?

I have a 3-phase, 440VAC, 50 Hz line supply (from a portable generator), with a load that can operate either on 380, 400, or 415, 50 Hz. I am hoping to find a "off the shelf" transformer here in the US that will step down the voltage to one of these levels. Is one of the above a better choice...

Is the speed reference an analog signal? (like 0 to 10 V) If the speed reference is an analog signal, then you need to set an "offset" value in the drive configuration.

It sure could. A loosely mounted motor may cause binding at the coupler. I would examine the coupler for damage. Generally, you can specify in the servo configuration how much position error is allowed before an error is generated. Your system maybe set so tightly that the little amount of...

I would examine the mechanism and make sure that it is not binding in anyway. Sounds like the system friction has increased. As a last resort, I would attempt to modify the tuning parameters.

ScottI2R, I was using a laptop without a floppy drive. It was a few months ago but I'm pretty sure it was a CD-RW because it had to transfer the "fingerprint" to my laptop & clear it from the CD. I'll check and let you know for sure.

I have been able to successfully moved the key via CD-RW in the past.

A reputable integrator that I know of is BD Automation, www.bdautomation.com. Experienced with all the major manufacturers(DVT, PPT, Cognex, Keyence, Acuity, Banner) as well as experience developing custom vision solutions using off-the-shelf cameras, frame grabbers, & industrial computers.

Check out AB's knowledge base. Do a search on "T30" and you will find the manual (pdf). http://domino.automation.rockwell.com/applications/kb/RAKB.nsf/$$Search/?OpenForm

What is the "industrial standard" wire insulation color for DC motor (90VDC or 180 VDC) leads? I've seen some places that use black and others that use blue. Are both leads the same color? Are the field & armature all the same color? Thanks