Had a lightning strike our pole supplying our manufacturing facility. It took out alot of contactors, or so it would seem. It took out 2 fuses and a resistor, or arrestor, on the pole. So there was still some power coming in. If we would have shut off the main breakers for the facility...
So we have 8 exhaust fans in our heat treat area. They all are on their own drive systems. One of the motors fried. We turned off the drive setup and were going to unhook everything but noticed 60-103 volts from any of the lines to ground. So I started to check things out a little closer to see...
This is just a generic schematic that I just modified to show what this machine that came in has. My question is; what would the SCCR be now with that transfomer in the power circuit? Or would it still be based on the lowest down stream component? I would think it would change. Hopefully you...
I opened up a 45kva dry transformer that was not in use for a few months to put it back in use. It's hanging from the ceiling of our facility. on each mount where the coils are, and the rubber pads are, there is a white crystalline foamy looking substance that pretty much disintegrates when you...
We have an Amada Saw that has an error code of E-210. It is not listed in the manual, online, and even the person at Amada didn't know and was going to look into it, but now will not return a call or e-mail. I saw on Prctical Machinist site that someone brought up that issue also, and of course...
See if there are any old guys out there that are familiar with these. We have a few Roll threaders that have Allen Bradley 1336 Impact drives on them. We initially set them up with the motor rpms from the motor nameplate. We now would like to have it reflect the rpm of the spindle so the...
We have a 3 phase 480v washer with heaters, a conveyor and exhaust and such. For some reason it blows the secondary fuse of the control transformer when the master stop is pushed.. It has run for years and has never done this, to my knowledge anyway. I've checked all heaters, pumps and motors...
So what's the compliant sizing of a 3 phase industrial rooftop heat/cool unit disconnect. The label gives us a 53 amp MCA (minimum circuit amps) and 70 MOP (maximum overcurrent protection). Can I use a 60A fusible disconnect? My understanding is the MCA is already calculated out with 125% above...
We have a new machine that came in. It has a 5ka rating. My available fault current is higher than that. I assume I need to install a disconnect and fuses to get it lower than the 5000. Anyone know what style or type of fuse I can use?
So when sizing the primary wires for a transformer that's powering a machine, can you use the machine loads for the sizing of the wires for the primary? That is after you do your calculations. Say you have a 70kva load machine that is supplied by a 75kva transformer. Can you take 70kva times the...
Looking at installing a 600 amp, 480v, 3 phase panel that will be fed from an 800 amp breaker from the switchgear room. What size wire can I use to run from the 800 amp breaker to the 600 amp breaker. I was assuming to parallel feed 600mcm because of the 800 amp breaker, but now I'm wondering...
So they are looking to add more CNC machines to an existing 400 amp Buss Bar over the manufacturing floor. How do you determine how many machines can be on that 400 amp line?
We are replacing a new CNC machine and the transformer we had for the old one is 45kva. The new machine is 123 amps at 220 volts. It's also rated for 205-235 volts. That equates to 46.86 kva. Will the 45 kva transformer be okay? I know the usual machines tend to run lower than the actual amps...
We have a few RENU FL055 plcs and FP3070 screens. One of the FL055s the RUN and ERR is flashing and we cannot connect to it. Anyone out there dealt with this problem before? can we somehow flash the plc? i don't care if I lose the program.
Looking at 670.4 in the NEC. It states that; The Nameplate provides the necessary information to size the branch circuit or feeder conductors, the machine disconnecting means,and overcurrent protection. The computation of motor and nonmotor loads is reflected on the nameplate as full load...
We have a big Washer in our Heat Treat room. There is a 100amp relay or contactor that is turning on and off every minute. Yeah I know, but that's the way the machine came brand new. They also sent a replacement contactor because they said it would go out in 6 months. I am looking into a...
Okay guys, I know I don't know what I am doing but I am trying to test a hockey puck SCR. I have a flashlight taken apart. I have the neg from battery going to negative of the light. I have the red wire from scr going to the pos of the light. I have the positve of battery going to the plate...
Anyone have any experience with this type of PLC? It is connected to a Magelis pushbutton controller. The controller says communicating... It never get's past that. The operator of this machine said the battery light was lit or flashing on the PLC. He never contacted maintenance and when he...
