Atlas Copco PowerMACS 4000, User Manual

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Set Up and Maintenance
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Program
You can either use an existing program or you can create a special tightening program called
“Calibration”. The tightening program shall have the following structure:

Step 1:
“Diagnostic” step with spindle functional test enabled and
Spindle Only selected as zero
offset compensation.

Step 2: Tightening step, e.g. torque xx Nm; speed yy rpm

Step 3: CE
It is practical to also create a loosening program to be used to loosen the tightened joint.
In the picture below is it defined one tightening and one loosening program.
With number of cycles set to the value 2, a loosening will first be done followed by a tightening.
Mode
Using the Mode option is similar to the Program one. The difference is that in the Mode option it is
possible to run different tightening programs for different spindles. As we normally recommend that you
shall only run one spindle at a time when you make a calibration is the mode alternative probably not a
real option.
4.17.3.2 Torque
All Atlas Copco torque transducers are factory calibrated to a sensitivity /-0.3% of the nominal
torque. Due to component tolerances in the TC electronics a fine tune of the torque sensor is
recommended. Exchange of a torque transducer to an identical unit does not require a new calibration, but
for quality control reasons it is anyway normally done.
An inline slip-ring torque transducer and a peak hold monitoring amplifier shall be used for the torque
measurement, e.g. Atlas Copco IRTT transducer with ACTA.