Procedural functions of press brakes
© Siemens AG 2003 All Rights Reserved
7-58
SIMOTION Safety Unit (AP) - Edition 06.2003
Figure 7-7 Valve control, part 3
For the "UP" request, you can specify which valve (valve pair) is to be controlled
during the upward movement.
Figure 7-8 Valve control, part 4
The "operational stop" function provides for "gentler" braking when a stop request
is made via the command devices or on a falling edge of the "DOWN" signal
request.
When a stop command is initiated either by a command device or on the falling
edge of the "DOWN" signal request, a shutdown delay (0 – 5000 ms) can be
parameterized. The stop command immediately switches off the "Enable DOWN"
output. Using this signal, the flow, e.g. through the control valve, can be reduced by
the higher level control and the machine speed can be slowed. A parameterized
delay time is available for the implementation of this process.
The corresponding valve (valve 1/valve 2) can be set to be de-energized
immediately by switching the "fast downwards speed" request signal.
•
Switching the "fast downwards speed" request signal level from "0" to
"1"
Valve 1 (valve pair 1) is de-energized immediately.
•
Switching the "fast downwards speed" request signal level from "1" to
"0"
Valve 2 (valve pair 2) is de-energized immediately.
