Movacolor MC-BALANCE, User Manual

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MC-Balance manual 22
7.6 Material Pre-calibration
The MC-Balance mainly can be started in two ways:
1) Start the unit
without pre-calibration
of material.
After pressing the START button the unit starts dosing on a speed that is based on default curves
which are pre-programmed in the controller. After start up the unit continues with self calibrating to
the Setpoint.
2) Start the unit
with pre-calibration
of material (OFF-LINE).
After pressing the START button the unit starts dosing on an speed that is based on material
calibrations made by the user which are stored in the controller. After start up the unit continues
with fine tuning to the Setpoint.
What is the function of a material Pre-calibration ?
With a pre-calibration it is possible to calibrate the unit before production is started, in this way the
time needed to come in spec. can be reduced. The MC-Balance is a gravimetric / loss in weight
dosing unit. When starting up the dosing unit for a new production run there is no direct information
available about the loss in weight. Of course you want the dosing unit to reach his setpoint with the
matching speed of the motor (RPM) as quick as possible. Starting the unit with a speed that is
already most near to the set point will achieve quick regulation. The correct RPM at the start of the
dosing unit can be determined automatically with a pre-calibration.
The pre-calibration can be done in two ways (see below)
1) Unit with option slide frame: 2) Unit without optional slide mechanism:
Slide the frame with unit backwards till the “click” Take out the dosing unit and put it on the frame like shown
•
It is important that during calibration the dosing unit is mounted fixed and horizontally and also
vibration free.
•
Before starting a material calibration be sure the hopper is filled with material sufficient.
•
Be sure that the loadcell cable is connected to the MC-Balance controller.
Following parameters will be stored with a Material calibration, depending on the configuration:
•
CONFIGURATION parameters: Cylinder type : type of dosing cylinder or feed screw
Material Type : Normal or micro-granules
•
PRODUCTION parameters: Shotwth. : Shot weight
color% : Color amount (%)
dos.time : Dosing time (sec)
Ext. cap. : Extruder capacity (kg/h)
•
CALIBRATION parameters: Material name : Name of calibrated material