OK, I thought I understood this more than I do. Can someone enilghten me a little.
1.) The primary reason for using a regen dc drive versus a non-regen is brakeing as I understand. The real question is it because a non-regen dc drive cannot control the deceleration effectively and a regen drive...
We have a wye delta starter with an open transition that keeps blowing the contacts of the delta contactor. We have had this happen 2 times with dif. machines.
It's a size 8 starter with a 1500hp motor. The line voltage is ~ 490vac.
I suspect it's happening on the transition when it's out of...
Type SK DC motor from Westinghouse 1950's vintage.
230VDC 131L frame 125 hp, 400 amps. No field information. Speed is 400 - 1200 rpm (Not 400/1200 rpm like I see on other types of DC motor.
Question 1 -- Is base speed 400 rpm or 1200 rpm? The seperate DC drive (looks like MG set) has no...
I have an Italian packaging machine that is currently down. It has never worked because of the scale being burned up. I replaced the scale, it weighs correctly and the entire system now works with the exception of the vibrator feed.
The vibrator has a coil that has 2 wires and was wired to 230...
Does anyone have guidelines or online resources used in retro-fitting dc motors and drives in general with ac motors and drives.
Common pitfalls?
Mistakes?
Good practices?
Opinions?
Thanks,
Carl
I have an interesting Italian overload unit that a customer is using....no brand name.
It has a little chart on the front that has the words FLC (which I assume is full load current) and Y/Delta. The vertical scale shows the current relationship to voltage on either side. I.E. Y or 460 on one...
Is there a mechanical device that can torque limit without destroying the gear train and attached motor? I seem to remember a clutch that one could set at a specific value.
Shear pins are currently used. And with the amount of devices; it is a maintenance nightmare. A VFD with torque limiting...
This is an elusive topic....I always thought torque control and torque limiting were the same thing. One of my contemporaries expressed that this was incorrect and then couldn't give me enough detail to support it. Can someone enlighten me to the difference.
Websites, articles, personal exp, or...
