Thanks Keith,
forgot to mention, the facilities also always have emergency lighting enough to move around in the rooms, and we're not allowed to switch those.
Agree prescence detection is the "best" solution, but unfortunately a bit beyond the budgets for this situation. It's of course all up to...
For about 40+ technical rooms (probably more), we need to implement some light-power saving features. Light load 500-2000W
There are already switches at (mostly 2) entrances, so 3 wire + earth is available from end to end.
The spaces are visited from daily to monthly.
Routine visits less than 1...
A story on availability...
Came to a plant with all ventilation in a production facility shut down, halting production.
Cause was found to be an LED leg (local position indicator for a damper) touching the metal of the panel it was mounted in.
History: some time earlier, a control transformer...
I agree with Waross.
To me, networks protection scheme appears needing a "design review".... From you mentioning "overvoltage" it could be there is an earthfault trip device sensing phase-earth voltage. This is not sensible in a floating network, especially not on a ship, where availability is...
Thanks for the responses.
GTstartup: A "smart" synchronizer, timing the closing feedback sounds interesting. Could you mention a make or model....could not seem to find one...
I found an article describing a similar problem, tough here with the general problem being mechanichal delay after "long...
I understand improper synchronization/ in particular too high phase angle can put generators and breakers under high stress, even tough there's no apparent problems during the regular breaker operations. Read a case story about damage long term, after "closing time" of breakers having been left...
I trust it to the degree of comforting myself on small/ low energy jobs where I don't physichally come in contact with conductors. As example, when needing to do retightening on a lot of (100's) small screwterminals I always "brush over" with such a device to quickly discover if there was...
Thanks! I think the aegis rings are something we will start fitting. Then on the efficiency side.....any idea of how much difference in power consumption this could make? I would "guess" its a small number, but possibly significant with many motors...
I have read from other threads that lowering switching frequency will improve efficiency, and reduce bearing currents.
We have some houndred VFD powered motors 0-20kW, and it appears setting tend to be left at default. Probably installers wanted to minimize their work... My perception is that we...
Was this a direct started motor?
If there's any solid state current control to soften the ride, there should usually be very low currents during break/make. Have several times experienced contactor faults, while elevators was still operating "almost" normal. (Only complaint was...
Make sure contactor is not installed so that vibrations from compressors itself is transferred to the contactor. Have seen this problem a few times on hi-pressure washing units - which are often built very compact...
Hi LaliGuras, Schneider-electric do have several well written booklets available on some topics, altough not an "all in one" handbook. Available online as free pdf files.
On my browser, this is the link...
