RVSS (Reduced Voltage Soft Start)
Advantages - Potentially low cost Soft Mechanical start
Disadvantages- May not be able to meet starting torque requirements. May not meet interconnect requirement Produce Harmonic
Advantages- Provides near rated torque at starting Soft mechanical start Meets utility voltage sag/inrush limits
Disadvantages- High installed cost Produce harmonics Complexity of equipment May require cooling equipment Synch transfer controls Requires M+1 additional motor starter
Capacitor Assisted Motor Start
Advantages- Provides near rated torque at starting Meets interconnect requirement Lower cost Simplest to install and maintain
Disadvantage- Does not provide a soft start function for mechanical loads that require it.