8.4 Breaker centering problems
8.4.1 Breaker centering switches too late to TE center mode
Problem:
When breaker centering switches too late to TE center mode, it will result in bad centered
material. An example of this behavior is shown in the following material scan.
Cause:
VVS can switch to TE center mode on the following conditions:
● Switch to TE command received from the PLC.
● Switch to TE based on length. Using the parameter breaker length, VVS can calculate
the start of the TE. Using this info it will automatically switch to TE. The calculated
switching point is 30 mm prior to the start of the TE. This functionality is only available
on TBMs equipped with a BK5120 encoder module.
● If the breaker width is less than 15 mm of the breaker parameter width. VVS will
automatically switch to TE center mode.
The main cause of this problem is that the PLC does not send the 'Switch to TE' command
on time to the VVS. Because this TBM is not equipped with an encoder, it can only switch
to TE center mode based on the PLC command or decrease of the width. In this example
VVS continues to position the material using body center mode until a critical width
decrease is measured. After which it will automatically switch to TE center mode.
Solution:
Make sure that the PLC sends the switch to TE command on time.
TROUBLESHOOTING
Breaker centering problems
8
THINKING FORWARD
VMI Vision System VVS (OL82) VVSX 13.0.12.0, VVSU 3.0.6 / 4 / 2016-07-11 / pd#175592
8-16
To Next Page
Loading...