Warner Electric B30 Single Range Tensioncells - Manual (Page 9)

9 Warner Electric • 800-825-9050 P-2012-4 • 819-0404
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 White leads for
each tensioncell with a volt meter with a
sensitivity of at least 100,000 ohms per volt.
The output 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
voltage.
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. (See calibration sheet for
voltage output.)
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 10)
3. With a voltmeter connected to Pins C and D
of the connector, an output voltage will be
observed.
4. Repeat Step 3 for the Tensioncell mounted
on the opposite end of the measuring roll.
Warner Electric Ioadcells instrumentation
provides the required signal conditioning and
a reliable 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
normally required for effective tension
instrumentation system control. Refer to the
documentation available from the
instrumentation supplier for more information.
Troubleshooting
When properly installed in accordance with the
original design specifications Warner Electric
tensioncells should require little or no regular
maintenance or service.
Certain conditions, however, can impair their
inherently accurate and reliable performance.
Therefore, if trouble should arise, the following
conditions should be checked. (Continued on
next page)
Figure 10
Roll
Rope
Web Path
Weights for
Max. Tension