EMC INDUSTRIAL GROUP LTD Features
MW93A_IM_ALL_SV6.09f_en 5/59
INTRODUCTION
Features
Basic
Units & Resolution
The units for each variable type (weight etc.) can be selected from a list of metric and imperial units.
The resolution of each variable type can be adjusted, this alters the count by e.g 100kg displayed in
0.2kg increments.
OIML Design
The instrument is designed to OIML standards.
Language Support
Support is available for the following languages: English, Chinese, Korean, German, Spanish, French,
Italian and Polish.
Inputs
Digital Inputs INx
The digital inputs are programmable to a range of function including ‘acquire zero’, ‘print’ etc.
Direct Calibration
Direct calibration uses the loadcell capacity and loadcell sensitivity to calibrate the weight signal. Large
capacity weighing systems can be quickly and accurately calibrated without the need for large test
weights.
Corner Adjustment (MT1 only)
The input sensitivity can be individually adjusted for up to 4 loadcells, allowing differences in loadcell
sensitivities to be corrected.
Four Loadcell Inputs (MT1 only)
Separate inputs are available for 4 loadcells allowing the signal of each to be monitored sperately. This
provide an aid for load balancing across loadcells and also for fault finding.
Flowrate Setpoint
The setpoint is the flowrate of material the operator wants the flow regulator to convey. The MW93 can
control to the local setpoint, which is set using the keypad, or it can control to the optional remote
analog setpoint signal. The second analog input AI2 is required for a remote analog setpoint.
Signal Filtering
Filtering for the weight can be adjusted to get the optimum compromise between reduction of plant vi-
bration and response speed.
Internal Signals
Limits
The high and low limits have adjustable setpoints which may be programmed to operate on any internal
signal.
Batching
The system can be used to batch out a desired weight by stopping the feeder when the batch weight
has been totalised. A pre-act is available to compensate for overrun.
Event Collection
Process events are collected for operation with external equipment (PLCs etc.)
Loop Control
The processor compares the flowrate with the setpoint. A proportional/integral (PI) control technique
with feed forward alters the motor speed demand signal to maintain the flowrate at setpoint. Feed for-
ward allows the system to reach the desired set flowrate very quickly and also to respond to changes in
setpoint rapidly.
Volumetric Mode
Normally the controller operates gravimetrically and automatically adjusts the speed demand signal to
reach the required flowrate setpoint.
In volumetric mode, the PI control is disabled, and the speed demand is estimated using the feed for-
ward settings.
This allows the system to be kept operating even in the event of a loadcell failure.
Advanced Control Settings
Feed forward settings can be adjusted and corrections for plant delays (transport delay) can be made. A
ratio setting is available to multiply the setpoint signal by a percentage for ratio control applications.
Hopper Refilling
The processor uses weight setpoints and delays to produce a material feed control signal. In a weight
loss system, the feed is opened to refill the weigh hopper from bulk storage when it nears empty. In a
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