- #1
kenneth edmiston
- 45
- 2
A 4160v chiller motor is drawing too much power at start-up. Utility company only let's them run it once or twice a year because of it. It dims all the lights etc.. It was originally a primary reactor starter (2 contactors). The PR was replaced with an auto-xfmr and wired the same. So now it’s a series auto-xfmr with no shorting contactor. The xfmr is fed, the secondary output supplies the motor at start-up, then a bypass or run contactor pulls in. So the xfmr is not shorted or disconnected from the circuit.
What could be causing the voltage dip on the source, or why is it causing it?
And why does a 3-phase auto xfmr need a shorting contactor? What does connecting the windings do besides dissipate the energy in the winding, and what does leaving them open do?
Thanks!
What could be causing the voltage dip on the source, or why is it causing it?
And why does a 3-phase auto xfmr need a shorting contactor? What does connecting the windings do besides dissipate the energy in the winding, and what does leaving them open do?
Thanks!
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