What factors must a motor starter allow for?
-Ease of starting and stopping by operator
-Prevention of automatic restarting after power failure, if unexpected restarting might cause injury to the operator
-Automatic overload protection for motors exceeding 370W rating
-Phase failure or reversal of phase rotation protection, if this is liable to cause injury or damage
-Provision for the remote starting and stopping of a motor, should this be required
When controlling a motors speed, across what range of conditions should the controller operate?
Full load and no load conditions
Two ways speed control can be achieved for Universal single phase motors are?
-Tapped field winding
-Continuously rated variable resistance
Two ways speed control can be achieved for three phase motors are?
-Pairs of poles