Recent content by sparks22222

when all else fails play dead thanks guys for all the help on that one..we have upgraded the braking resistor and the unidrive inverter looks more reliable than the omron inverter..looks ok for now after checking the above readings from your replies..will keep you all updated if it fails again...

Hey guys, I came across this VFD problem in one of our locations.This plant had a problem with an Omron VFD where the drive (5.5kw) is operating a rooftile holder which goes up and down at low and fast speeds with a brake installed. Well before i came to the location(3 y old only) the...

Thanks mdom, very useful, keep sending them on!!!

Is there any software available that can estimate the sizes of electric cables depending on length, current, etc. Badly needed Sparks 22222

Hi, Is there any websites that show how to build a single phase/ three phase converter. to drive a 3 phase 5.5 hp motor for light wood cutting application. 220v incoming supply. appreciated sparks

Has anyone information on the difference between generation power and electricity power in terms of cost? Is there any websites available? we have currently two diesel generators running(well) in a quarry, and we may need to change to grid power. Any disadvantages, advantagaes to this...

WE HAVE ELIMININATED THE HIGH EDDY CURRENTS CAUSING THE MAIN INCOMING GLAND TO HEAT UP BY CHECKING ALL EARTH CABLES. WE FOUND SOME EARTHS WERE NOT CONNECTED PROPERLY. THIS MAY CAUSE HIGH CURRENTS IN EARTH

Pilts, Have the same problem at the moment with eddy currents in a heavy installation. Contractors used light steel plate for glands instead of brass or aluminium. Always make sure your plates are of this material. Gland for incoming cable heated to a non- touchable temperature. You have been...

Transient Voltage Suppressor.\\I may check up on these for protection.

Thanks guys for the replies, sorry i was a bit vague with the question. anyway, there is an input and output chokes before and after the inverter so its well protected from overvoltage. Everthing was properly checked and earthing is ok. We are not sure of lightning yet, but we have decided to...

We have a new asphalt plant set up in the last year and production has been good, but last week came across a problem with a 75 kw inverter controlling a skip. At present the plant is being powered by a big generator. Six months ago, the electronic card in the compressor packed up, and now the...