NORSTAT Safety Relays - Handbuch (Seite 92)

application guide safety relays from riese electronic page
88
6 Application examples for - multifunction relays
a) SAFE Flex
Dual-channel e-stop application with monitoring of the start-
button and short-circuit proof.
The e-stop button has to be connected to the input channels (S11/S12 and
S21/S22) and the start-button to the reset circuit (S32/S33). Link S33 to S34
with a bridge or the feedback control loop.
The activation of the outputs (13-14,23-24,S31) results after closing and re-
opening the start-button, both input channels have to be closed (e-stop-button
not pressed). If the e-stop is pressed the outputs of the device fall off
immediately, the contacts 13-14 and 23-24 are opened. The auxiliary output
S31 becomes inactive.
General information:
For this operating mode the terminals S35/S36 must be bridged. For the e-stop
mode the simultaneity* of the channels is infinite. The two channels must not
have different signals when the supply-voltage is switched on. That means
both contacts of the e-stop button or safety switch have to be opened or
closed. In case of a faulty input-wiring, the device will switch to the FAIL-
SAFE mode (safety-switch-off).
Category 4, PLe, SIL 3 reachable
Dual-channel safety gate application with monitoring of the start-
button and short-circuit proof.
The safety gate switches have to be connected to the input channels (S11/S12
and S21/S22) and the start-button to the reset circuit (S32/S33). The activation
of the outputs (13-14,23-24,S31) results from closing and re- opening of the
start-button, both input channels have to be closed (safety gate closed). If one
or both safety gate switches are opened (by opening the safety gate) the
outputs of the device fall off immediately, the contacts 13-14 and 23-24 are
opened. The auxiliary output S31 becomes inactive.
A reset can not be effected until both safety gate switches are opened
simultaneously.
General information:
For this operation mode the terminals
S35/S36 must be bridged. For the
safety gate function the simultaneity* of the channels is infinite. The two
channels must not have different signals when the supply-voltage is switched
on. That means both contacts of the safety gate switch have to be opened or
closed.
In case of a faulty input-wiring, the device will switch to the FAIL-SAFE
mode (safety-switch-off).
Category: 4 , PL e, SIL 3 reachable
S32 S33 S22 S12 S11 S21 S34
A1
Kext
S35 S36 A2
Start
+24V DC 0V DC
Dual-channel safety gate application with automatic start and
short-circuit proof.
The safety gate switch has to be connected to the input circuits (S11/S12 and
S21/S22). A bridge or feedback control loop (S32/S33) switches the device into
the automatic start mode. The activation of the outputs 13-14, 23-24 and S31
results from closing the contacts of the safety gate switch. By opening one or
both contacts of the safety gate switch the outputs of the device fall off
S32 S22 S34 S11 S21 S33
S35 S35 A1 A2
Start
Kext
S12
+24V DC 0V DC
NORSTAT INC. 300 Roundhill Dr. Rockaway, NJ 07866 Tel: 973-586-2500 Fax: 973-586-1590 www.norstat.com