Controllers boost inrush currents when they sense a starting motor.
Start capacitors are reenergized each time a load motor starts.
Run capacitors are continuously controlled for best voltage balancing.
With some controllers, three-phase voltages are symmetrical at all times.
There is no need to oversize a converter.
E and R controllers
E controls the start capacitor. This is for the idler as well as for load motors.
There is no need for a start relay.
R senses the voltages and uses a second run capacitor for voltage symmetry.
This can be added to older rotary converters.
RS controllers for fast motor starts and two-stage voltage balancing.
A long lasting thyristor replaces electromechanical starters.
They start any idler motor in fractions of a second.
They also sense starting load motors and produce high currents during their acceleration.
RS controllers engage a second run capacitor when high loads reduce the output voltages.
Converters with R controllers can operate CNC machines and machines with VFDs.
RS controllers are available for all world voltages and frequencies.
T / F controllers
T and F controllers sense starting motors and boost the inrush currents for fast motor starts.
They also engage groups of binary weighted run capacitors for voltage balance and full power.
Binary grouping of run capacitors keeps the capacitor count low.
Three-phase voltages are symmetrical at all loads.
T and F controllers are used in converters especially for CNC machines, inverter loads, welders.