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MANAGERS AND PROJECTIONISTS 527
OPERATING INSTRUCTIONS— WARNING— The supply wires for motor generator equipment should have sufficient capacity to prevent the speed of the motor from being appreciably affected by voltage drop at anything up to a thirty per cent overload for a few moments, or up to 100 per cent overload for not to exceed say fifteen seconds.
BEFORE STARTING A NEW SET be sure that all oil wells are filled with high grade oil — oil suitable for dynamos. Oil well overflow plugs must be kept open. Draw off all oil at regular intervals, the length of which will depend upon the number of hours of use per day — just use common sense, remembering fresh oil is much cheaper than renewing bearings ruined by using oil too long. Refill with fresh oil. The oil removed may be filtered and re-used if desired, though we do not recommend it. DON'T try to "save" money by buying cheap oil, get the best there is.
STARTING — When installation is finished, including all electrical connections, close all switches, including lamp circuit. Move contact arm on generator field rheostat to point marked "IN" and then start the motor.
STARTING TYPE CS POLLY-PHASE MOTORS— Be sure the auto starter handle is in "OFF" position. Close the circuit breaker, if one be used, and then the main switch. Move auto starter handle to starting position. As soon as the motor armature has reached nearly full speed (very soon you will be able to judge this closely) move auto starter handle to running position. DO NOT LEAVE AUTOSTARTER HANDLE IN STARTING POSITION. If an auto-starter be not required — if it is not a part of the installation— , then the starting switch must be closed in starting position and left until the armature has attained nearly full speed, whereupon throw the switch to running position. See "REVERSING DIRECTION OF ROTATION."
STARTING TYPE AR SINGLE-PHASE MOTOR— Close
line switch, whereupon the motor will start as a repulsion motor, with current flowing through the brushes and commutator. When full speed is reached, a centrifugal governor, located inside the armature, automatically short circuits the armature windings, which causes the motor to run as a squirrel-cage induction motor, the brushes being thrown off contact by the end thrust of the armature.
Note — If local power company requires it, a starting rheostat must be used for starting the motor, though the motor