Can constant voltage power conditioners be used to power motor loads?
A. Care needs to be exercised when constant voltage power conditioners (CVPC) are used to power motor loads. When a motor is energized, the lock rotor amperage required to get the motor started is normally 6 to 8 times the normal running amperage, or 600-800% of the load. When the load is increased beyond the CVPC’s rated value, a point is reached where the output voltage suddenly collapses and will not regain its normal value until the load is partially released. Under direct short circuit, the load current is limited to approximately 150-200% of the rated full load value and the input watts to less than 10% of normal. Therefore, under short circuit conditions, the SolaHD CVPC actually runs cooler than at no load. A constant voltage power conditioner, such as the MCR, will protect both itself and its load against damage from excessive fault currents. Fusing of load currents may not be necessary. The actual value of short-circuit current varies with the specific design and rating. Unit
