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MOTION PICTURE PROJECTION 701
three-phase outfits they should be equipped with double-throw starting switches which have only one side fused.
When starting up, the switch should be closed to the unf used side. When the speed of the armature is up to normal the switch should be quickly changed to the running side (fused side).
To start up an A. C. to D. C. Compensarc where a starting compensator is used, see that compensator arm is in the "off" position and close the main switch. The compensator should be thrown into the starting position with a quick, firm thrust and held there until the machine comes up to speed (about 20 to 30 seconds), and then with one quick firm movement the arm should be pulled over into the running position, where it is held by a lever engaging with the low-voltage release mechanism.
Never, in any case, should the motor be started by "touching," that is, by throwing the starting arm into the starting position and quickly pulling it out a number of times. Such a plan of "touching" does not make the rush of current at starting less, but, on the contrary, it produces a number of successive rushes in place of the one which it has been attempted to avoid, and, what is often a more serious matter, causes the contact fingers to be so badly burned that it is necessary to replace them. To stop the machine open the main switch. The compensator arm should automatically return to the "off" position on the opening of the main switch; if it does not, throw it over to the "off" position by hand.