Atlas Copco PowerMACS 4000, User Manual

Page: 605 / 668

Peripheral Devices
9836 3521 01 605
If a mode between 1 and 50 is selected the program that is specified for that mode in the mode table is
used for the calibration. This can be any tightening program that is included in the setup. In this case there
is only possible to calibrate the torque.
Controlled by TC
If the calibration is controlled by the TC the cycles are started from the TC as all normal tightenings. The
start can come from a digital I/O, a fieldbus or some other external equipment. It is still possible to select
the mode number from the ACTA if wanted. The PLC system global ACTAMODE will reflect the mode
selected from the ACTA and it is possible to connect this to the output MODE.
Calculation of Torque Scale Factor
The ACTA unit can calculate a new torque scale factor, based on the torque measurements that were
made in the TC and in the ACTA. It is also possible to save this value in the TC if the difference from the
old scale factor is less than 10%.
Requirements on the tightening program used for calibration
Any normal tightening program can be used for the calibration, but it is important to consider how the
ACTA detects cycle start and cycle end to make sure the values sent from the TC really correspond to the
values measured in the ACTA
See Atlas Copco Tools document No. 9836 2086 00 [4] for how to operate the ACTA test equipment.