Technical Reference; Principle Of Operation; A.1 Principle Of Operation - Siemens SITRANS L Series Operating Instructions Manual

Technical reference

A.1

Principle of operation

A low revolution gearing motor drives a rotating measuring vane. When material reaches the
rotating vane, rotation stops, actuating a switch. When the vane is no longer covered,
rotation resumes and the switch reverts to its normal condition.
The synchronous induction motor is freely suspended within the housing. When the rotation
is slowed by the material, the reaction torque is used to operate a switch that gives an
electrical signal to stop the motor. When the material level moves away from the rotating
vane, a spring draws the motor back into operating position, the switch returns to operating
position, and the motor is switched back on.
Two motor speeds are available:
32
1 rpm, for storage silos
5 rpm, for faster process requirements
Operating Instructions, 04/2019, A5E34210883-AB
A
SITRANS LPS200