11-20 Definitions Flashcards
Control power transformer
A transformer which serves as the source of AC control power for operating AC devices
Overspeed device
A direct connected speed switch which functions on machine over speed
Synchronous speed device
One which operates at approximately normal synchronous speed of a machine or any type of device which functions at approximately normal machine speed
Under speed device
One which functions on machine speed below a desired value
Speed regulating device
One which functions to hold the speed or frequency of a machine or system at a certain value or between certain limits
Battery charging control device
The battery charger
Series field shunting circuit breaker or contactor
Serves to open and close a shunt circuit around a machine series field
Accelerating or decelerating circuit breaker contactor or relay
One used to close or cause the closing of circuits for bringing a machine up to speed or shutting it down
Starting to running transition contactor or relay
Operates to cause the transfer of a machine from the starting to the running power connections
Electrically operated valve
A solenoid valve or motor operated valve
