Operating Manual EMGZ480
16
8
Calibrating the Measuring Amplifier
To get correct measuring values, offset and gain have to be set before putting the device
into operation. There are several methods to do this:
8.1
Simulating Method, Calibration with the PLC or PC
The following instructions are referring to a
setup and calibration inside the machine.
The material tension will be simulated by a
weight (Fig. 12). Offset and Gain
calibration is done in the PLC or the master
computer.
Checking the Force Measuring Sensor
•
Connect Force Measuring Sensor to the
EMGZ480 amplifier (ref. to 7.4 “Wiring
Diagram”).
•
Check whether a load in the processing
direction results in a positive signal. If
the output is negative, change the wires
+signal
and
–signal
in the amplifier.
•
If a second Force Measuring Sensor is
required, repeat previous point.
Offset Compensation
•
Align Force Measuring Sensor in the intended operation direction (red point).
•
Insert material or a rope loosely to the machine.
•
Find with CAN-BUS object 2051h the offset value.
The measuring amplifier calculates
automatically the offset value.
•
The found value is stored in the object 2001h
Offset
in [Digit].
Gain Determination
•
Load material or rope with a defined weight (Fig. 12). The roller configuration must
correspond to the real configuration in the machine (wrap angle, distance of the
rollers etc.)
•
Enter the force in [N] or [lbs] corresponding to the used weight in the CAN-BUS
object 2052h. This will initiate the calibration process.
•
The calculated Gain value is stored in the parameter CAN-BUS object 2002h
Gain
.
Fig. 12: Calibrating the measuring
amplifier
C431011e