Advanced commissioning
7.6 Basic positioner and position control
Converter with control units CU250D-2
172
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
7.6.4
Limiting the positioning range
Description
Positioning range for linear axes
The converter limits the positioning range of a linear axis using a software limit switch. The
converter only accepts position setpoints that lie within the software limit switches.
Figure 7-28 Limiting the positioning range of a linear axis
In addition, using its digital inputs, the converter evaluates signals from stop cams. When
passing a STOP cam, the converter responds – depending on the setting – either with a fault
or an alarm.
Fault as response
When passing the STOP cam, the inverter brakes the axis with the OFF3 ramp-down time,
switches the motor off, and reports the fault F07491 or. F07492. To switch the motor on
again, you must do the following:
●
Switch the motor off (OFF1).
●
Acknowledge the fault.
●
Move the axis away from the STOP cam, e.g. using the jogging function.
Alarm as response
When passing the STOP cam, the converter brakes the axis with the maximum deceleration
(see Section: Limiting the traversing profile (Page 178)), maintains the axis in closed-loop
control and outputs alarm A07491 or A07492. In order to bring the axis back into the valid
traversing range, you must move the axis from the STOP cam, e.g. using the jogging
function.
Setting the limits of the positioning range
Precondition
You have selected the "Limit" screen.
Procedure
To set the limits of the positioning range, proceed as follows:
1.
Enable the software limit switch.
2.
Move the axis to the positive limit position in your machine. Set the position of the
software limit switches to the actual position value.
