Motor Starters Diagrams. The coils pi and p2 are selected to have pickup voltages at the desired values of counter emf. These electrical devices are also used for the purpose of stopping reversing and protecting electric motors.
Magnetic starter wiring an allen bradley 709 3 phase for single 220v the hobby machinist. This diagram is for single phase motor control. Three phase motor connection schematic power and control wiring installation diagrams.
Terminal markings corresponding to those shown on the diagrams will be found on each switch.
If you have a 120v coil instead of running a line from coil overload l2 you must run coil overload neutral. When the armature terminal voltage reaches the pickup value of pi relay pi closes applying the voltage to coil 1a which closes relay 1a shorting out resistance r l etc. Print the electrical wiring diagram off in addition to use highlighters to trace the circuit. The motor terminal connection in the case of star and delta is shown in the above figure where u1 v1 w1 is the start terminal of each winding and u2 v2 w2 is the finish of.