Originally posted by: handlewithcare
Previous employees in my firm have fitted a chiller unit with some local pfc on the compressors.
Is PFC actually present and how is it connected?
Looking at the schematic for the chiller, it shows a 3 lines separating after the circuit protection for each compressor and going to 2 contactors, ie 3 phases to each. From each contactor, there are 3 phases to each winding in each compressor shown marked (UVW) and (ZXY).
Almost certainly, this is star delta operation for 3 phase operation to larger kW ratings of motors.