Warner Electric A30 Single Range Tensioncells - Manual (Page 8)

Set up and Adjustments Specifications
Type "K" 24 volt DC LVDT Specifications
Input . . . . . . . . . . . . . . . . . . . . . . . . .6-30 volts DC
Output . . .0.5-6.5 volts DC (nominal, open circuit)
Output Impedence . . . . . . . . . . . . . . . .2.5K ohms
Current Consumption . . . . . . . . . . . . . . . . . .40 mA
Recommended Load . . . . . .100K ohms or greater
Max. Operating Temp . . . . . . . . . . . . . . . . . .250°F
Note: Warner Electric loadcells are
calibrated for 24 volt DC input voltage to
provide a 0.5 to 6.5 volts DC output signal.
Electrical Zero Adjustment
(Read the complete Electrical Zero Adjustment
procedure before proceeding with the adjust-
ment.)
1. Disengage strip from the measuring roll so
that no tension force is applied to the load-
cell.
2. Connect a voltmeter to Pins C and D. (See
Figure 8)
3. Apply 24 volt DC electrical power to the
loadcell observing the correct polarity. [Plus
(+) to Pin A and minus (-) to Pin B.] Do not
exceed the maximum rated input voltage.
Note: Allow 20 minutes for the loadcell to
warmup before taking first readings to
insure accurate readings.
4. Measure the output voltage of the LVDT
between the Green and Blue leads for each
tensioncell with a volt meter with a sensitivity
of at least 100,000 ohms per volt. The out-
put voltage should be between 0.5 and 6.5
volts.
5. Since Warner Electric Tensioncells cannot be
mechanically zeroed, refer to the Control
Manual for zeroing out the tare weight volt-
8 Warner Electric • 800-825-9050 P-2012-3
(Figure 9)
Roll
Rope
Web Path
Weights for
Max. Tension
Full Load Adjustment
After the loadcell has been zeroed, a pull test
can be made to check the output voltage of the
loadcell at full load.
1. Run a non-stretchable rope over the center
of the tension roll simulating the web path.
(Note: The rolls should be free to turn.)
2. With one end of the rope secured, hang a
known weight equally over the roll so that
the total tension is equal to the maximum
strip tension specified on the calibration
sheet, at the other end. (See Figure 9)
3. With a voltmeter connected to Pins C and D
of the connector, an output voltage will be
observed.
Warner Electric Ioadcells instrumentation pro-
vides the required signal conditioning and a reli-
able high level output signal for use as feedback
control of a tension drive system. The feedback
signal is directly proportional to the strip tension
applied. If a Warner Electric control is used,
refer to the control manual for further calibration.
Although the electrical output of Warner Electric
tensioncells are sufficient to drive most electrical
indicators, substantial signal conditioning is nor-
mally required for effective tension instrumenta-
tion system control. Refer to the documentation
available from the instrumentation supplier for
more information.