OP
Whiskeymike
Well-known member
I got it all completed today. 222v to the machine. Special thanks to mm08822 for walking me through it all.
Recommend buck boost for Magnetic brake
- Thread starter Whiskeymike
- Start date
My pleasure!As been said before, "220/221 whatever it takes."
Post some pics of your first project.
Gee, I guess that if 222 didn't let out the smoke, 220 probably would not have either. Considering normal small line fluctuations, 222 IS 220. There is no such thing as different 220, 230 and 240 service. I usually measure about the same as the OP, just over 220. Tell me how low voltage is going to damage a dynamic brake? It might not work as well but damage?
Sent from my SM-G900V using Tapatalk
OP
Whiskeymike
Well-known member
the manufacturer says that it needs to be 220v +/- 5% which means roughly 209v to 231v. I don’t know how it would break, as I don’t understand the intricacies of electromagnetic circuits.
All in all, it was an extra $100 to get it working. I knew before I bought it, I might have to do this. As long as the brake works to my expectations, I’ll be happy with it.
All in all, it was an extra $100 to get it working. I knew before I bought it, I might have to do this. As long as the brake works to my expectations, I’ll be happy with it.
theoldwizard1
Well-known member
Electromagnets are pure resistance when used in a DC circuit. In an AC circuit they also have inductance, but that is not really important in this application.
If the voltage is above spec, then the magnet will draw more current (Ohm's Law V=IR and R is constant in this case). More current will mean more heat .
Now because this magnet is only turned on for a short period of time and that is followed by a long off period (very low duty cycle) this probably does not matter. If used in some kind of "production" environment with pre-cut blanks and pre-set edges stops that duty cycle could easily get above 50% and then the extra heat could be an issue.
nsula_country
Well-known member
OP did right by following the recommendations of the MFG. Line voltage at our house and shop (2 services) run about 242v-248v. Well above their spec for the machine. If this had been my brake, I'd probably use a buck too. Had this been a motor, I would haven't thought twice about hooking up and using the machine.
At work our 480 is tapped about 500v-510v when the plant is idle. Once everything is running and loaded it drops to about 482v-490v. A plant down the road was having some issues and asked the City to bump the primary up a little. Then we had some devices starting to trip on overvoltage alarms around 500v (Fronius 500 amp Inverter Welding Power Supplies). We ended up dropping down an output tap on our transformers.
There are limitations of how high or low of voltage devices will tolerate.
CT
At work our 480 is tapped about 500v-510v when the plant is idle. Once everything is running and loaded it drops to about 482v-490v. A plant down the road was having some issues and asked the City to bump the primary up a little. Then we had some devices starting to trip on overvoltage alarms around 500v (Fronius 500 amp Inverter Welding Power Supplies). We ended up dropping down an output tap on our transformers.
There are limitations of how high or low of voltage devices will tolerate.
CT
foolishpride
Well-known member
I would have asked the POCO to raise the tap on the tapchanger on the transformer supplying you. Probably would eliminate the need for the zig-zag transformer.
bloomingtonmike
Well-known member
Old thread. But I picked up a Baileigh Magnetic Brake last week and got a SquareD Buck Transformer installed last night. Made a video about that if anyone needs the info. Used same calculator listed here in this thread as it turns out.
nadogail
Well-known member
This is a whole lot of discussion on how to connect a simple Auto Transformer.