Pilz PSS SB HYD, Basic license - Manual (Page 184)

6-122 Modular Block System: Hydraulic Presses
Standard Function Blocks
Output parameters
• ENBL: Enable for the test closing stroke on the press
ENBL = 0: No enable for the test closing stroke
ENBL = 1: Enable for the test closing stroke
• OK: Press overrun is in order
This signal acts as the enable for normal operation after the
test stroke; if
OK=1, the press may start production, because
the machine's overrun is in order .
OK = 0: Press overrun not in order or overrun measurement
not yet performed
OK = 1: Press overrun in order or overrun measurement
performed successfully
Procedures
1. Use the UP button to move the press to the extreme top position (ETP)
2. Start the overrun measurement via a two-hand circuit, for example (0/1
pulse edge at STRT -> ENBL = 0/1 pulse edge)
3. Hold down the two-hand buttons ( STRT = 1 -> ENBL = 1)
4. Press reaches the test cam, upward movement is stopped ( ENBL = 0)
and the ‘MTi’ time is started
5. Release the two-hand buttons ( STRT = 0)
6. Once the ‘MTi’ time has elapsed, a test is carried out to check if the test
cam (TLS) was passed:
- If no: Overrun is in order ( OK = 1)
- If yes: Overrun is too long, press is disabled
(
OK = 0). No further downward movement is
permitted on the press -> Use the UP button to
move the press to ETP, check all the conditions and
repeat the overrun measurement
Please note:
• The block must be incorporated into the PSS user program for the press
in such a way that the measurement is effective in terms of the
respective requirements of the machine’s safety concept, e. g. it must be
run when the controller is switched on, so that the initital stroke on
starting the machine is a test stroke.
SB086