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...
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 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...
A not uncommon sight when opening a motor terminal board cover is overheated insulation on leads to stator.
Looking on different motors, there's different configuration/order of nuts/ leads/ washers....on a terminal some have both leads between same nuts, some have them separated, some have...
Our room air handling units have a 3 speed fan (controlled by a 3 relay output honeywell controller) with a 2uF capacitor.
About a year after installation, we started to suspect "something wrong", and found that most capacitors (measured with a regular multimeter) was around and below 1uF. We...
