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...
OK, after recovering from the superbowl...I went back out and looked at this thing.
1.) There are field leads, but they were cut off during dis-assembly...and pulled all the way back into the casing. The Resistance is 55 ohms. Digging through the gunk on the mg-set I found the seperate...
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 found the answer....
I put a diode on one side of the 230 input and it creates the vibration.
Not bad for an 89 cent diode from radio shack
Thanks all
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
You can check with the following companies.
Square-D/Telemecanique (Which is handled by Graybar)and Namco
These 2 groups where the majority of what I used in the past. If you tell them what kind of environment...they can help you determine what level of protection that you need.
Carl
The package is called LookoutDirect. It is a National Instruments product...the only diference is the amount of I/O points available (550 from the ADC product). NI sells the package with more.
The demo version of the software would only write to 10 bytes of memory. You could connect and...
ADC does have a local VAR in Canada:
Franklin Empire Inc. / Control Mart
1180 Martin Grove Road
Rexdale, Ontario M9W 5M9
Canada
Phone:(416) 248-0176, or
1-800-263-4961 (in Canada)
Fax:(416) 248-2735
E-mail: rex@feinc.com
Web Site: http://www.feinc.com
These guys also do integration.
Ask...
One option, which djs mentioned about inexpensive plc's. I recently helped design a system with a guy who was doing something very similar.
iFIX is DDE/OPC compliant. You run KEPdirect (ethernet based OPC server) the iFIX package becomes the client. This allows all of automationdirect's (Koyo)...
phillipm2:
The slc500 does DH485. So you would use the EZ-DH485-CBL cable to connect to the slc500 from the EZ touch panel. In the eztouch software (EZ-touchedit)you would choose driver "ab slc500/micrologix dh485/AIC."
This is also all listed in the help file in the software. It is...
Everyone's definition of a soft plc varies.
The concept of a scada system interfaced with processor based plc's is common and very reliable. The redundancy is the plc itself. You can lose the scada pc and the plc's will still control the process.
If you are speaking about PC based control...
You can try looking at the following:
"Creating Human Machine Interfaces Using Visual Basic" By Jeff Weigant www.industrialvb.com
"Automating Science and Engineering Laboratories with Visual Basic" by Mark Russo and Martin Echols.
You can also look at the following...
A couple of things that I have found out with elevators and hoists.
1.) Like Jbartos posted, really look at inverter rating. I have always rounded to the larger drive if the current output rating was close to the total of all the motors being driven.
2.) Individual motor protection is also a...
