Cleveland Motion Controls Cleveland-Kidder TMI, Инструкция по эксплуатации

Страница: 8 / 18

8 of 18
A800-7425 J
Figure 6
3.0 ADJUSTMENTS
the right transducer. Calibrate the left transducer with be suitable to calibrate using a 100 lb. weight (or
the TRL switch in the left position and calibrate the right 100 lbs. force on a spring scale).
transducer with the TRL switch in the right position.
With a screwdriver, turn the calibrate adjustment meter needle to the desired reading.
potentiometer ¾ clockwise. Using the zero adjustment
potentiometer, zero the tension meter.
D. Remove the load. The meter should return to zero.
Check to see that the system is operating properly by and C again checking meter zero. Two or three
applying a force to the sensing roll. Pushing or pulling in load applications are sometimes required to
the load direction of the web force should cause the properly "seat" the transducers. With all
tension meter to move up scale. adjustments completed, remove any cords and
3.3 CALIBRATION
The unit should be calibrated so that normal running
tensions will be about mid-scale and the maximum
tensions will not go off scale.
For TRL models, calibrate each transducer for about
25% of scale so that the total signal is about mid-scale.
NOTE: It is recommended that the indicators be
calibrated with the transducers at the process operating
temperature.
Spring Scale or Weight Method of Calibration
A. Thread a length of rope or flat webbing over the
center of the sensing roll, as shown in Figure 6. Do
not thread over non-turning rollers, driven rolls, or
frame braces as any sliding friction will cause
inaccurate calibration.
B. Apply a known tension load using weights or a
spring scale. If possible, the applied load should be
approximately the same as the anticipated
operating tension. If, for example, a normal
operating tension of 100 lbs is anticipated, it would
C. Using the CALIBRATE adjustment bring the
If necessary, readjust ZERO then repeat steps B
weights used in the calibration procedure.
If it is found during running that the operating tension is
much less (or greater) than estimated, a recalibration
may be required.
3.3.1 Calibration with Dual Range (Scale X4) Feature
- The calibration procedure is similar to that for standard
indicators except that the calibration should be made on
the most sensitive scale (lower scale). For example, with
0-25/0-100 meter scale, calibrate on the 0-25 scale.
3.3.2 Calibration with TRL Feature - The calibration
procedure is similar to that for standard indicators. Note
that the calibration procedure can be made in either of
two ways. The quickest method is to apply a known
tension load exactly midway between the transducers.
Then calibrate on each side for ½ of the load. That is,
with the indicator on TOTAL apply a known load for
example, 50 Lbs. Switch to RIGHT and calibrate so the
meter reads 25 Lbs. Switch to LEFT and again calibrate
to 25 Lbs. If necessary, repeat the calibration.
Calibration can also be made by applying loads
simultaneously to both transducers. The TOTAL should
always be equal to the sum of the two applied loads.
3.4 CALIBRATION OF THE TLD CARD
OPTION
If the TLD card is not installed, mount it with the four
plastic standoffs to the indicator circuit board assembly
as shown in Figure 2. Connect a TLD on-off switch as
shown in Figure 2.