© Siemens AG 2003 All Rights Reserved
SIMOTION Safety Unit (AP) - Edition 06.2003
6-47
6 Procedural functions of hydraulic presses
6.1 Control of valves for hydraulic presses
Definition
This function controls the following elements:
•
Directional valves for both the upward and downward movement
•
Safety valves
Operating instructions
•
This function can be used to activate 3 different valves (or double valves).
•
Each valve is controlled via two channels (P/M-switching) with 24 V/2 A.
•
Single channel inputs are the reversing point in the TDC and BDC.
•
In the case of an automatic takeover, the "Safety point" and "Pressure value"
signals must be queried on the input side.
•
In "Setup" mode, activation of the two-hand switch or the foot switch causes
the press to move to BDC (inching). An upward movement is brought about by
activating the "UP button".
Note on the wiring of the "Takeover point"
The "Safety point" and "Pressure value" signals are evaluated at the takeover
point. To detect a short circuit between these two signals, one of them must be
supplied via the encoder clock (e. g. by using a mechanical switch).
Parameterization
Figure 6-1 Extras - Output pin assignment (hydr.)
6
