Pilz PSS SB HYD, Basic license - Manual (Page 178)

6-116 Modular Block System: Hydraulic Presses
Standard Function Blocks
Function test on the gate
The conditions for requiring a function test are described in the sections
entitled “Operating modes”, “Procedures” and “Error messages”. The
function test is always prompted by the appropriate error message (see
section entitled “Erorr messages”).
During a function test the gate must be opened and then closed again.
The signals at the gate switch (
S1, S2) must switch from '1' to '0' (on
opening) or from '0' to '1' (on closing). During this process synchronisation
time monitoring is active, as during a normal closing operation.
If the gate is still open before starting the test, it must first be closed. If the
prompt to carry out a function test is received while the gate is still locked,
it must first be unlocked (see section entitled “Procedures”).
Whether or not a reset is required after performing the function test is
defined via the input parameter
ARSt.
Additional safety guidelines
WARNING!
The following information must be heeded! Failure to comply with these
guidelines could result in serious injury or death.
• The safety gate, gate switch and guard locking device and the way in
which they are arranged must comply unreservedly with EN 1088
“Interlocking devices associated with guards”.
• If you are using a gate switch and a combined gate switch/guard locking
monitoring circuit, certain errors cannot be detected. In this case it will be
necessary to carry out a function test on the gate as part of each cycle,
i.e. the gate must be opened and closed regularly.
You can meet this requirement by activating the function test cyclically
through a 1/0 pulse edge at the
MRun input (e.g. each time the machine
stops), so that it is only possible to restart the machine after the gate has
been opened and closed. If all these conditions are met, this configuration
can achieve Category 2 at best in accordance with EN 954-1.
SB075