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zappedagain, a CT is a current transformer. I am learning about these now and am still a rookie, therefore trying to gain some valuable information on them from more experienced people. Operahouse, thanks for reply. I understand the the level of danger involved with this current level. I am...

oh ok, that is what I thought. They have mentioned to me that they want an ammeter installed on the operators console so they can monitor the current during the firing sequence. There is currently a CT on the busbar, it is an IME TAS125. 2500 amps, VA 60. There are two leading on the side of...

Hello, I have a question about the Vacuum Metallization using a vacuum chamber. I was a a place today where they make spot lights for vehicles and they use this process for coating the inside of the lights to give it the shiny difuser. They were speaking about the firing sequence...

waross? what contacts are you referring to? I have changed the main motor contactor due to the old one having welded contacts? jraef, there is no devicenet incorporated. It is a 1940s lathe and the wiring looks that old as well. no drawings, labelling, a real treat to work on. burnt...

thanks I have meggered the motor windings and have >200Mohms from each phase to earth and have the same readings across all three windings. The motor directly drives the lathe via a set of v belts. THe voltage balance is good within a volt right across the three phases, the current balance...

anyhow, this is why I am on this forum to ask a bit of advice from others. The whole issue is that I am working for a tight ass customer that doesnt want to pay for much at all. Therefore it is vital that we perform our work and get out as soon as we can. I know that I/we shouldnt be taking...

thats for your 2 cents jraef. If the motor is only pulling 15-20 amps whats wrong with bumping up the overload, my test equipment assures me that its not pulling any larger amps

I would ASSUME that as well. I would say that the motor needs to have an IR test performed. So you definelty have to go to the site to peform this.

hello thanks for reply. I did check the motor currents on all three phases. And they were very close to the same, say within an amp or 2. What do you think? thanks

Hello all, Got called to a lathe yesterday and found that the main motor contactor contacts where welding closed, thus not allowing the operators to stop the motor. Anyhow I changed the contactor with new one and installed a new overload (AB E1 plus 18-90 amp range) Started the motor and the...

I wouldnt say that using rigid metal would be an issue. I have seen this alot in here in australia. (I know the standards are different though). I would definetly earth/ground the metal conduit though, in case an active cable shorts to conduit. Whippee2

No worries, thanks for replies. I am sure I will get called out again for the same problem, probably tomorrow. I have printed out a pdf about these rectifiers and brakes and hopefully nut this one out. I am not quite sure what these control cables are for tho. Ill ask a couple of gurus at...

Hello all, I am new here and have been reading alot of topics on this forum and have learned quite alot. I work as an industrial service tech. Here is the issue I ran into on Friday. Got called out to a job and there is a 5.5 kw sew motor with a brake assembly mounted on the rear of the...