14.9 Touch Probe Function
The SERVOPACK provides two fast touch probe inputs. The Touch Probe function allows
the user to record the actual position of the connected motor at the time of a digital trigger
event (e.g. signal edge at the touch probe input) and makes this value immediately avail-
able to the controller. The actual position is then further processed by the controller,
depending on the control system.
A feed-to-length application is one where a specific amount of material is to be fed a
known distance and stopped, then followed by another process. There are no stipula-
tions on the size and type of material, and no limitations on the following process once
the material has been fed.
Materials range from fine gauge wire, to slabs of steel, to sheets of plastic. Post-feed
processes include cutting, welding, scoring, and stamping, to name a few. Common
methods of feeding material in a feed-to-length application include the use of conveyors
or pinch rolls. The walking beam approach is also used, while another approach uses a
gripper to pull the product to the desired length.
Applications which can benefit from the Touch Probe function are cut-to-length, vertical
form fill and seal machines that do not require camming, paper cutting, wire cutting,
stamping, and any other high speed application where moves are based on high speed
registration.
Sample application:
Feed-to-length
High Speed Latch Sensor
Host controller
6”
(Part)
5”
(Index Length)
Knife
Press anvil
SERVOPACK
Fig. 370: Feed-to-length sample application - Stamping
You can latch the feedback position with the following trigger events.
n Trigger with touch probe 1 input (Probe 1 Latch Input (/EXT1) signal)
n Trigger with touch probe 2 input (Probe 2 Latch Input (/EXT2) signal)
n Trigger with encoder zero signal (phase C)
The following two touch probe latches can be used at the same time.
Sigma-7 Series SERVOPACKs
PROFIdrive Drive Profile
Touch Probe Function
| | PROFINET Communications - SIEP YEUOC7P 02A Revision 0 | en | 517
To Next Page
Loading...
