Atlas Copco PowerMACS 4000, User Manual

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Tightening
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6.5 Tightening Program
The Tightening Program defines the algorithm to use for tightening a bolt. This includes evaluating the
result of the tightening, during execution as well as the final result, and fault handling.
A Tightening Program consists of the following parts:

Common settings like name, program number, etc.

User variables and their values

Steps, the basic blocks to build a program with. The parameters of each step is divided in the
following parts:
-
Control
– Defines function of the step, i.e. when to switch off, in what direction to run, etc.
-
Restrictions
– Used for supervision of the control function. All the restriction tests are
executed in parallel with the control function and if any limit is exceeded it will interrupt the
execution of the step.
-
Checks
– Defines variables that are measured during the execution of the step but are not
evaluated until the step has finished. Checks never interrupt the execution of the step.
-
Reject Management
– Defines how to do an automatic repair in case of a step failure.
-
Speed
– Defines which speed to use during the step.
-
Other
– Used for setting up start delays, stop conditions, etc.

Bolt monitoring. Defines how the complete tightening cycle should be evaluated. It is configured on
the Checks tab for the CE-steps. Bolt monitoring differs depending on at which CE-step the
program execution ends.

Trace settings
Synchronization
You can choose if the execution of the steps should be synchronized between different spindles or not.
When a station starts a tightening cycle the individual bolts may run freely as long as the steps are not
synchronized. When the spindle encounters a synchronized step it will wait for all other spindles to reach
their synchronization steps. Spindles may run different number of steps between the synchronization
points.
This function is best used in in-homogenous stations with spindles that do individual jobs, e.g. a marriage
point in a car assembly.
It is possible to compare how programs will run in relation to eachother by having two or more programs
open in the
Tightening Program form and clicking the Match Sync. lines toolbar button.