64 1/3/02
4 Calibration
4 Calibration
4.1 Tension Calibration
1.
Check that load cells are mounted and oriented properly. Refer to the load cell
installation instructions.
2.
Before applying power, check that tension meter is mechanically zeroed. If not,
adjust the small screw below the meter scale until the meter reads zero.
3.
Apply power to the controller and let it warm up for at least 10 minutes.
4.
With web removed and no tension applied to the sensing roller, adjust
potentiometer R1 until analog tension meter reads zero.
(If non-cabinet version is
used, see digital display: tension should read 0%.)
If value is below zero, turn R1
clockwise; if above, turn counterclockwise.
Note:
R1 and R2 are 25-turn potentiometers, so many rotations may be required.
5.
Thread a rope over the center of the tension-sensing roller following the exact path
of the web. Make sure the rope extends at least one roller
before
and one roller
after
the sensing roller. Make sure the rope does not pass over any dead bars or
non-freewheeling rollers. Fasten one end of the rope securely.
6.
Attach a weight of known value to the other end of the rope. For best results, the
weight should be at least 25% of the analog meter's full-scale value. A tension
value below 0% with the weight hung indicates that the signal from the load cells
is reversed. In the event of such a reversal, switch wires 12 & 14 and 41 & 43 on
the terminal block. To eliminate friction, rotate rollers in the direction of the weight.
For cabinet and non-
cabinet versions of
the controller, see
section 2.2, p. 9.
MANUAL
MANUAL/
AUTO
AUTO
TENSION
OFF / ON
T
20
80
50
20
80
50
20
OUTPUT
IL004.dsf
R1
R2
R3
R4
R5
R6
+
Back Space
Up
DO 4
DO 3
DO 2
DO 1
0
0
Load cell
IL005.dsf
