what happens if starting arm of starter does not return to "OFF" position after a temporary supply failure?

  • $\begingroup$ It starts when the supply comes back on ... $\endgroup$ – Solar Mike May 23 '19 at 7:38
  • $\begingroup$ @SolarMike are you serious $\endgroup$ – user19926 May 28 '19 at 15:11
  • $\begingroup$ The dc starter adds resistance to armature winding to limit starting current. As Mike says, motor starts with current depending on position of starting arm. $\endgroup$ – StainlessSteelRat May 28 '19 at 20:25
  • $\begingroup$ @StainlessSteelRat that is the point if position of starting arm is stuck to its position after a temporary power supply failure what would happen. Resistance offered by starter would be zero, ... Right? $\endgroup$ – user19926 May 29 '19 at 4:06
  • $\begingroup$ Yes. The purpose of the dc starter is to limit starting current by inserting a resistance. If starter was locked in on position, motor would start as a shunt (compound, etc) motor. $\endgroup$ – StainlessSteelRat May 29 '19 at 11:12

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