Roll force measurement system fits old and new
A
Vishay Nobel product story
Edited by the Engineeringtalk editorial team
Apr 18, 2002
The RFS 3 system from Thermo Nobel is a purpose-built roll force measurement system, designed specifically for use on both new and existing rolling mills.
The RFS 3 system from Thermo Nobel is a purpose-built roll force measurement system, designed specifically for use on both new and existing rolling mills.
The system provides the mill operator with the continuous monitoring and display of roll separating force and differential balance forces.
In addition, it also provides local and remote indications of 'metal in mill' and 'mill overload'.
Signal outputs representing the rolling mill forces on each side of the mill that are being measured by the system are supplied for the operation of remote indicators or for use by external control systems.
The system is designed to retrofit on to existing rolling mills that have no load measurement facilities and where the fitting of load cells is either impossible or prohibitively expensive.
It uses the principle of extensometers fixed to the mill stand, where the sides of the mill stand then become the load cells.
The system utilises four Thermo Nobel high performance signal transmitters, AST 3P and two or four Thermo BLH Type E-4 semiconductor extensometers.
The four AST 3P units communicate using Modbus RTU protocol, via the master unit to pass force and status details to all units.
Each unit thus has all the force values to enable it to show the four computed values - 'work side', 'drive side', 'sum' and 'difference'.
Each one can be configured to output via its analogue port for either 0-10V, 4-20mA or 0-20mA to represent any of the computed values.
Trip levels can also be configured to energise relays at pre-set values and referenced to any of these computed values.
There is also built-in redundancy so that if a transducer is damaged or has an incorrect output, its value is ignored, an error light and signal is generated and the complimentary transmitter doubles its output to make up for the missing one.
Three front panel LED indicators show the system communications status, the 'metal in mill' level status and the 'overload' status.
A toggle switch selects, in conjunction with the 'remote zero track' switch, the 'zero track' mode.
The local and remote switches work in parallel to inhibit the 'zero track' function, so, if the remote switch is 'on', the local switch has no effect, and vice versa.
A momentary switch enables the operator to zero the inputs.
The two or four Model E4 extensometers are connected via either one or two junction boxes to the RFS 3 unit.
Special high temperature cable is utilised to wire the extensometers to the junction box, while stainless steel braid armoured cable is used from the junction box to the unit.
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