SG-BWS-T4
20
4.8.
Reset mode and connection of the Start/Test/Reset push-button
The interruption of a beam due to an opaque object causes the opening of OSSD outputs and the stop
of the safety control unit (SAFE condition,
SAFE
).
ESPE standard operation can be reset (OSSD safety outputs closing, NORMAL OPERATION
condition,
NORMAL) in two different ways:
Automatic reset: After its activation ESPE resets to standard operating condition once the
object has been removed from the controlled area.
Manual reset: After its activation, ESPE resets to standard operating condition only once the
reset function has been enabled and provided that the object has been removed from the
controlled area. This condition determines interlock status, pointed out on the display by the
relevant warning (see section 6 “Diagnostics and warnings”). The reset command will only be
effective if button is held for over 0.5s but less than 5s.
Automatic or manual reset mode is selected by duly connecting
terminal 6 (see 4.3 “Complete list of
connections”).
Carefully assess risk conditions and reset modes. In applications protecting
access to dangerous areas, the automatic reset mode is potentially unsafe if it
allows the operator to pass completely beyond the sensitive area. In this case,
manual resetting is required.
Power
Safe
Break
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
5| 6| 7| 8
1| 2| 3| 4
Start/Test/Reset
24VDC
0VDC
Fig. 19 Start/Test/Reset button connection
Reset control shall be output by a suitable push-button with NC contact towards 24VDC, as shown in
the above diagram.
The START signal is active low.
Carefully spot the most suitable position for the reset push-button!
Install the reset push-button outside the dangerous area so as it is not possible to
activate it from inside the area. The operator shall always be able to see the whole
dangerous area whenever activating the reset push-button.
