FORM NO. L-20186-B-0702 8
B. SPAN ADJUSTMENT
1. Thread a rope or narrow web over the sensor roll in
the normal web path, making sure that the rope is
in the center of the sensor roll. Hang a known
weight (weight must be less than the Maximum Full
Scale) on one end of the rope. Secure other end
of rope to machine with the known weight held off
the ground (See Fig. 10).
2. Set Power Switch to “ON”.
3. For Two Sensor Calibration:
a. Set Read out Selector Switch to “No. 1”, and
adjust No. 1 Span variable resistor until the Digital
Display shows one half the known weight on the rope.
b. Set Read Out Selector Switch to “No. 2”, and
adjust No. 2 Span variable resistor until the Digital
Display shows one half the known weight on the rope.
c. Set Read Out Selector Switch to “TOTAL”. The
Digital Display must read the known weight on the rope.
4. For Single Sensor Calibration:
a. Set Read Out Selector to “No. 1”and adjust
No. 1 Span variable resistor until the Digital Display
shows the total known weight on the rope.
b. Set Read Out Selector to “No. 2”and turn No. 2
Span variable resistor counterclockwise to “ZERO”.
c. Set Read Out Selector Switch to “TOTAL”. The
Digital Display must read the total known weight on
the rope.
5. Set Power Switch to “OFF”.
OPERATION
Figure 11
Start machine in operation with a web in place. Set “TM140-D” Power Switch to “ON”.
Figure 10
1. Tension Indicator will display tension at No. 1
Sensor, No. 2 Sensor, or Total Web Tension, as
commanded by Read Out Selector Switch.
2. Recorder Terminals will put out a buffered signal,
proportional to the Digital Display, with 0 to 10
volts being equal to zero to full scale in high-range.
Recorder Terminals are also controlled by the Read
Out Selector Switch.
3. The No. 1, No. 2, and Total signals at terminals 26,
27, 28, and 29 on the back panel (See Fig. 7, Page
3) are also proportional at 0 to 10 volts equal to
Maximum Full Scale, but are not controlled by the
Read Out Selector Switch. They constantly put
out the appropriate proportional and buffered
signal.
4. The External Meter Terminals 14 and 15 present a
0 to 1 milliampere buffered output which is also
proportional to Maximum Full Scale.
5. The 4 to 20 milliampere signal at Terminals 10 and
11, and the 0 to 10 volt signal at Terminals 29 and
30 are also proportional to 0 to Full Scale but they
are not buffered.
6. When tension falls to zero, the normally open Zero
Tension Relay contacts close. This relay signal can
be picked up at Terminals 12 and 13. The
contacts are rated at 250 VAC, 0.2A.
