Emerson Epro MMS 6350 Digital Overspeed Protection System
Description:
The speed measurement and protection system DOPS serves measurement of and protection against inadmissible overspeeds at any kind of rotating machinery.
With the consistent three channel construction, starting with the signal detection via signal processing up to the evaluation of the measured speed, the system offers the maximum safety for the machines to be monitored.
Safety relevant limits (e.g. overspeed limit values), are combined in a 2 out of 3 logic and operate in the closed circuit mode. Thus it can been sured that beside operational safety, the protection function on a high level standard is met as well.
With a suitable sensor arrangement at the trigger wheel of the machine it is possible to detect the direction of rotation.
The integrated peak value memory permits reading out the maximum speed value that has occurred before the machine was switched off. This function provides important information fore valuating the mechanical machine load caused by the overspeed.
Alarm outputs and  error messages are output via potential-free optocoupler outputs. Beside this, the alarm outputs, combined in a 2 out of 3 logic, as well as message line and channel clear line of the channel supervision, are output via potential-free relay contacts.
The system includes an extended fault detection function. The three speed sensors are continuously checked on operating within the permitted limits. Moreover, the channels mutually check and supervise the output signals of each other. lf the internal fault detection circuit detects an error, this will be indicated via the output contacts and shown on the display asplaintext.
By using preformed connection cables and screw terminals, the system may be integrated economically in a 19" cabinet.