Deprag AST40-1 User Manual

112
12 Screwdriving Strategies and Commands
12.1 Screwdriving Strategy
12.1.1 Tighten / loosen to Torque
The screwdriving strategy tighten / loosen to torque is a tightening / loosening process with
stop control via parameter torque. Angle monitoring is possible as an option.
Figure 107: Screwdriving Application to torque
Strategy description:
At the start of the screwdriving sequence cycle time monitoring is started. Cyclic torque
measurements are performed. If the angle measurement option is active then angle
measurements are performed additionally starting at the preselected torque threshold.
Shut-off criteria:
The screwdriving process is ended once the:
• Target torque is achieved
• the maximum screwdriving time (monitoring time) is exceeded
• the maximum angle of rotation is reached (only for angle monitoring)
Analysis:
OK evaluation:
The screwdriving sequence is considered OK (fault free), if the shut off is
achieved via torque and the torque value is within the preset limits.
With optional Angle monitoring active the angle value must also be within the
preset limits.
Not OK analysis:
The screwdriving sequence is evaluated as Not OK (faulty) if the final torque
value is outside the preset limits or the maximum screwdriving time has been
exceeded.
If angle monitoring is active the screwdriving sequence is evaluated as Not OK,
if the angle value is outside the preset upper and lower limits.

Deprag AST40-1 Specifications

General

Brand	Deprag
Model	AST40-1
Category	Controller
Language	English