FMS CMGZ100, Руководство по эксплуатации

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Operating Manual CMGZ100
7
5 Operating the strain gauge amplifier
5.1 Calibrating the strain gauge amplifier
•
Connect first sensor.
•
Test if feedback signal (z18) is positive when sensor is
loaded. If signal is negative, change z4 and z6.
•
Connect second sensor
•
Test if feedback signal (z18) is positive when sensor is
loaded. If signal is negative, change z4 and z6 of second
sensor.
•
Insert material loosely into machine.
•
Adjust feedback signal (z18) to zero with
potentiometerR1 (Offset).
•
Load material with known weight as shown in the sketch
beside.
•
Adjust feedback (z18) to required voltage at the loaded
weight with R2 (Gain).
5.2 Lowpass filter
The Tension Controller provides a first-order lowpass filter to eliminate noise coming from unbalanced rollers,
oscillations of the band material or similar.
The adjustment of the cutoff frequency is done by means of a non-polarized capacitor using the following table:
Setting the cutoff-frequency
The corresponding capacitor is chosen with the following formula or table:
C = 10 C: Capacity in Mikrofarad, F: Cutoff-frequency (3dB-Point)
F
Frequency in Hertz Capacitor in
Mikrofarad
1 10
2 5
5 2
10 1
20 0,5
50 0,2
100 0,1
200 0,05
500 0,02
1000 0,01
5.3 Setting the limit switches
The two limit switches are adjusted with built in potentiometers.
The minimum limit is adjusted with R3. The corresponding voltage can be measured at pin X4.
The maximum limit is adjusted with R4. The corresponding voltage can be measured at pin X5.
The voltages are compared with the tension feedback signal (z18).
C431011e
Table: Cutoff frequency of lowpass filter.
The filter is acting on the feedback signal.
The capacitor has to be soldered to pins X2 and X3.
Use non-polarized capacitors because positive and
negative voltages can occur at this point.