Thanks for the info, I will check those links out. I am looking for the same motors, having a hard time with the CEMP SPA motor.
FYI we a a real variety here, 50 and 60Hz and Nema / IEC.
adds to the challenge
I have some class 1 / div 1 exp motors that I need to replace but having a hard to find them
The manufacturers are Siemens, CEMP SPA and ABB.
Can anybody suggest a reputable place to contact?
Prefer USA or EU supplier. Motors are to shipped to and used in West Africa
Hi there,
I am in Africa and I need to put on a very basic course on the theory, operation of voltage source VSD's for the local electricians. Do anyone have a link or a doc that I could use on a overhead for this training?
thanks in advance.
thanks, but one thing I know for sure is the Robicon drive I am talking about uses diodes on the front end of the low voltage power cells. not SCr's etc. I am quite familiar with those types of systems, or CSI drives that don't have a need for a precharge circuit. I am not used to a passive...
I was told that the Robicon Gen 3 power cells do not use a pre-charge circuit for the DC Bus and they actually use the high impedance of their special pahse shifting, multi tap tansformer. Can anyone confirm or deny this? if so it will be the first VSD that I have seen to not use a pre-charge...
you are all right, ct's & pt's should be grounded accordeing to NEC and other documentation out there if they are under a certain voltage. what I meant by seeing ct's shorted and grounded is where they have been pre-installed a system but are NOT being used and NOT in a box, I hope you know...
I still don't see a lot of CT's grounded either at the terminal strip or anywhere else, The only time I see them grounded is when they are not being used, "shorted & grounded"
I have spoken to a couple of electrical engs. and they also agree they do not need to be grounded. According to the CEC...
Thanks, good advice but again my question is then why on doughnut type CT;s there are only two wires coming off the CT and no point to attached a ground. I know you could ground a leg where you terminate the wire but again I have rarely seen this.
The reason this question came up is that we have...
Can someone help. we are having a debate if the secondary of a current transformer needs to be grounded?
I have never seen this done, all I have ever seen is just two leads coming of the CT going into a terminal strip or device(meter etc)
I am thinking it may be a difference between european and...
Thanks CJPE. We have both types of drives here and I had to stop one of the guys from shorting the output on the VSI drive like you can do for a CSI drive when doing start up etc. One thing I tried to explain is that with a CSI drive the output voltage is depended on the current and load (...
Can anyone help me explain in laymans terms the difference between a current source and a voltage source drive. I know basically the difference(diode front end compared to scr-active front end) but find it hard to explain. Even if there is link to go to would be great.
