G - Physics – 04 – C
Patent
G - Physics
04
C
58/0.4
G04C 9/00 (2006.01) G01D 15/24 (2006.01)
Patent
CA 1171667
ABSTRACT A process instrument, of the type having a movable indicator to represent the magnitude of a process condition, has its motive power supplied by a relatively high-speed steeping motor. The motor is servo-controlled by a feedback circuit, including a potentiometer coupled to the indicator drive mechanism, which develops a feedback signal corresponding to the indicator position. The system is arranged to actuate the motor immediately upon develop- ment by a circuit of a deviation signal outside of a fixed deadband, but the extent of initial motor movement is limited to a pre-set small amount (prefer- ably one step). If the deviation signal still is outside of the deadband after a predetermined period of time, a clock pulse oscillator is turned on to actuate the motor at a relatively rapid rate until the deviation signal returns to the deadband. The instrument also includes special limit circuitry for preventing motor activity when the pen has been driven to either end of its full-scale stroke.
412282
Foxboro Company (the)
Smart & Biggar
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