CCC Model CMS Zero Speed Control

Overview

The Model CMS Motion Sensing Control and Model CMS-DSPO (Dual Setpoint Pulse Output) are compact units designed to include all mechanical and electronic components in one housing. Both the CMS and the CMS-DSPO protect all valuable rotating equipment including belt conveyors, bucket elevators, rotary feeders, or screw conveyors. The CMS Model produces an output signal at a predetermined speed which may be either under-speed or overspeed. The CMS-DSPO Model produces signals at each of two predetermined speeds: two over-speed, two under-speed, or one over-speed and one under-speed. Model CMS-DSPO also produces a pulse rate signal for external monitoring with a PLC or Tachometer.

NEED TO KNOW
Both Controls operate in either a clockwise or counterclockwise direction and can be mounted in any position. The mounting surface must be flat and smooth. The CMS and the CMS-DSPO Controls sense motion with a precision metal disc mounted on the input shaft. This disc generates measurable light pulses as a series of slots on its periphery rotate past an infra-red light source. A photo-electric sensor monitors the series of light pulses and converts them to a digital electronic signal. Solid state circuitry then analyzes the digital signal and activates or deactivates the output relay at the pre-set signal speed. Both models have an adjustable built-in time delay, which eliminates the need for a separate start-up time delay. Both the CMS and the CMS-DSPO will sense under-speed or overspeed conditions. Three signal speed ranges are available with each model. The low signal speed range is from 0.1 to 10-RPM. The medium signal speed range is 1 to 100-RPM, and the high-speed range is 10 to 1000-RPM.

Zero speed sensing can be accomplished by locking the signal set point adjustment screw at its lowest setting of 0.1-RPM. The output relay will then de-energize when the shaft speed of the Control approaches zero. The output of both models is a DP/DT relay, connected to the terminal block at the rear of the Control. There are two sets of output contacts that include normally open, normally closed, and common. As a result, these Sensing Controls can be used to control two separate circuits such as a motor starter and a signal light.