CMC Controls Ltd - DTAX Tension Amplifier www.cmccontrols.co.uk

CMC Controls Ltd - DTAX Tension Amplifier www.cmccontrols.co.uk
CMC Controls Ltd - DTAX Tension Amplifier
www.cmccontrols.co.uk
General Description
The DTAX tension amplifier is a compact signal conditioning amplifier designed for use with any of the CMC
Controls Ltd range of tension transducers.
The measurement of actual web tension is made by sensing, with strain gauge transducers, (sometimes
referred to as ‘load cells’), the force on a sensing roller caused by the tension in the web. The electrical signal
from the transducer is a combination of tension force and roller deadweight. The deadweight of the sensing
roller is zeroed out electrically, leaving only the tension force to be displayed on a meter.
The DTAX requires an external 24V d.c. power supply
The DTAX unit uses high specification amplifiers and an integral voltmeter in a DIN rail mounted housing.
The DTAX provides transducer excitation of either 5V or 10V d.c., an analogue voltage output (0-10V d.c.)
relating to the total tension detected (The sum of the left and right transducers if two transducers are fitted),
separate left and right output voltages and 0-20mA or 4-20mA into 250ohms for remote metering or to the
input of a control system. There is in addition a dual range facility as standard.
The DTAX has fully variable zero offsets for both positive and negative roller deadweights.
Installation
The DTAX must be installed in a dry, ventilated, non-hazardous location. The housing snaps onto a standard
35mm wide DIN rail [EN50022].
The transducers must be installed in accordance with the procedures from the Transducer Handbook and for
Intrinsically Safe installations the transducers must be installed using only the connecting cables with earth
bonding conductors, the cable screens connected to earth at the Zener Barrier busbar only. The Zener
Barriers MUST be installed as directed in the Zener Barrier Handbook to achieve a safe installation.
Always use screened cable for connecting transducers and analogue outputs. If the cables are extended the
screen conductors must be electrically continuous.
Terminal Arrangement
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Reference: DTAX
CMC Controls Ltd - DTAX Tension Amplifier
www.cmccontrols.co.uk
DTAX Dimensions and mounting detail
Dimensions:
Width
Height
Depth
Weight
72mm
90mm
58mm
182g
Fixing:
35mm DIN Rail [EN50022]
DTAX/H - Half Bridge Transducer Connections for Safe Area Installations
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Reference: DTAX
CMC Controls Ltd - DTAX Tension Amplifier
www.cmccontrols.co.uk
Full Bridge Transducer Connections for Safe Area Installations
Connections for Cleveland Kidder Ultra Transducers
See the Transducer Handbook for alternative CMC Controls Ltd wire colour coding.
Connections for ACDF and Foil Gauged Transducers
See the Transducer Handbook for the SIG+ and SIG- wire colours
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Reference: DTAX
CMC Controls Ltd - DTAX Tension Amplifier
www.cmccontrols.co.uk
DTAX Calibration
The DTAX will be factory set for an excitation voltage of 5V d.c. for semiconductor transducers, 10V d.c. for
foil transducers and the internal gain is factory set according to required transducer type at the time of
ordering. Contact CMC Controls Ltd regarding any required changes in transducer type.
To calibrate the DTAX correctly a spring balance or weights to provide the maximum required tension force
and some flat webbing or packaging tape to simulate the web would be useful.
Connect the transducers to the DTAX [terminals 1 - 5 for the Left transducer and terminals 6 - 10 for the
Right transducer] according to the transducer type.
1. Connect the DTAX to a suitable 24V d.c. supply with +24V to terminal 24 and 0V to terminal 23
2. Connect a ‘select enable’ wire link between terminals 11 and 12 to enable menu up/down and select
membrane switches.
3. Switch on and observe green ’RUN’ indicator ‘on’ and meter display powered
4. Ensure that there is no web material in the machine
5. Press the ‘select’ button once to step to the ‘L Zero’ position and adjust the zero multiturn preset located
immediately above the left transducer terminals to obtain a reading on the meter as close as possible to
0% (0V)
6. Press the ‘select’ button once again to step to the ‘R Zero’ position and adjust the multiturn preset located
immediately above the right transducer terminals to obtain a reading on the meter as close as possible to
0% (0V)
Steps 5 and 6 have now removed the effect of the sensing roller deadweight
7. Thread the webbing or tape or tape over the sensing roller following the web path exactly, anchor one
end firmly as shown. Do not thread over a non-turning roller, driven roller or machine frame as any sliding
friction will cause errors.
8. Apply the maximum high tension force to the free end of the webbing or tape. If the force is insufficient
for the maximum desired value the amplifiers may be calibrated proportionally.
9. Press the ‘select’ button to step to the ‘L Cal’ position and adjust the ‘up’ and ‘down’ buttons as required
to display as close to 100% as possible.
10. Press the ‘select’ button to step to the ‘R Cal’ position and adjust the ‘up’ and ‘down’ button as required to
display as close to 100% as possible.
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Reference: DTAX
CMC Controls Ltd - DTAX Tension Amplifier
www.cmccontrols.co.uk
11. Press the ‘select’ button to step to the ‘T1 Out’ position, the display will depict 100% tension
corresponding to the accuracy of the ‘L Cal‘ and ‘R Cal‘ settings. The display may be scaled to a required
figure by adjusting the ‘up’ and ’down’ buttons to depict the actual tension force.
12. Press the ‘select’ button to step to the ‘T2 Out’ position, if a second measurement range is required,
reduce the load to simulate the required second range force to the free end of the webbing or tape and
adjust the ‘up’ and ‘down’ buttons to display as close to 100% as possible.
13. Press the ‘select’ button to step to the ‘Run’ position and confirm that the meter reads the first range total
output of 100%.
14. To prevent accidental mis-adjustment of the programmed settings remove the ‘select enable’ link from
terminals 11 and 12, this will disable the ‘select’, ‘up’ and ‘down’ buttons.
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Reference: DTAX
CMC Controls Ltd - DTAX Tension Amplifier
www.cmccontrols.co.uk
DTAX Power and Metering connections
External meters to read 0 to +10V full scale can be supplied by CMC Controls Ltd or an alternative method of
displaying the tension values can be provided by the user.
The voltage outputs could alternatively be connected to a programmable logic unit [PLC] for signal
conditioning and logic control.
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Reference: DTAX
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