Dc Motor 2 Point Starter Diagram. Connected to the positive terminal of the power source 2. This type of starter can be used for shunt and compound motors and if the field is lost the starter drops out protecting the motor against runaway.
Here for starting the motor the control arm is moved clockwise from its off position to the on position against the spring tension. This starter is a so called three point starter. Now the question is why these types of dc motors require the assistance of the starter in the first place.
These connections are in accordance with nema mg 1 and american standards publication 06.
The 4 point starter has a lot of constructional and functional similarity to a 3 point starter but this special device has an additional point and coil in its construction as the name suggests. A 4 point starter protects the armature of a dc shunt motor or compound wound dc motor against the initially high starting current of the dc motor. Here for starting the motor the control arm is moved clockwise from its off position to the on position against the spring tension. These connections are in accordance with nema mg 1 and american standards publication 06.
