Rockwell Automation FlexPak Plus DC Drive User Manual
Page 65
B:2
Service Factor (SF):
When used on a motor nameplate, a number which indicates how much above the
nameplate rating a motor can be loaded without causing serious degradation, (i.e. a 1.15
SF canproduce 15% greater torque thana 1.0 SF rating of the same motor).
Tachometer:
A small generator normally used as a rotational speed sensing device. Tachometers are
typically attached to the output shaft of a motor requiring close speed regulation. The
tachometer feeds its signal to a control which adjusts its input to the motor accordingly
(called closed loop feedback" control).
Thermostat:
Units applies directly to the motor's windings which senses winding temperature and may
automatically break the circuit inanoverheating situation.
Torque:
Turning force delivered by a motor or gear motor shaft, usually expressed in poundsĆfeet:
lbs.ft. = HP x 5250 / RPM = full load torque