Further Applications
5.1-
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany, Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: [email protected]
2009-01
2.5-2
2.5
PL e of EN ISO 13849-1, SIL 3 of EN 62061
PNOZsigma contact expander module
- PNOZ s7.1 and PNOZ s7.2 with base unit PNOZ s4
Features
Dual-channel operation with detection
of shorts across contacts
Monitored reset with falling edge
Contact expansion through PNOZ s7.1
and PNOZ s7.2
Feedback loop to monitor contact ex-
pansion
Supply voltage via
PNOZsigma connector
Description
E-STOP function
When the E-STOP pushbutton S1 is
operated, the input circuit on the safety
relay PNOZ s4 (K1) is interrupted, the safety
contacts on K1 open. As a result, the input
circuit on the contact expander modules
PNOZ s7.1 (K2) and PNOZ s7.2 (K3-K4) is
interrupted via the PNOZsigma connector,
the safety contacts at K2 to K4 open.
Settings on the unit
The connectors between the safety relays
PNOZ s4 (K1), PNOZ s7.1 (K2) and PNOZ
s7.2 (K3-K4) must be connected.
The terminator on the PNOZ s7.2 (K4)
must be connected.
The operating mode selector switch
(mode) on the safety relay PNOZ s4 (K1)
must be set to “Monitored reset, falling
edge with detection of shorts across
contacts (In2-)”.
Start/reset
The safety relay PNOZ s4 (K1) can be
started by pressing reset button S2 if:
E-STOP pushbutton S1 has not been
operated and
Safety relays K2 to K4 have de-energised
and
Contactors KM1 to KM6 have de-
energised.
Feedback loop
The positive-guided N/C contacts on
contactors KM1 to KM6 are monitored in
feedback loop S12-S34 of safety relay
PNOZ s4 (K1).
Safety assessment
The safety relays PNOZ s4, PNOZ s7.1,
PNOZ s7.2 and contactors KM1 to KM6
must be installed in a single mounting
area (control cabinet) in order to exclude
a short across the output.
Earth faults and shorts between contacts
in the input circuit are detected.
A fault on the device does not lead to the
loss of the safety function.
The safety relays PNOZ s4 (K1), PNOZ
s7.1 (K2) and PNOZ s7.2 (K3-K4) can be
started when the input circuit at K1 is
closed first, followed by the reset button
S2. This avoids an unwanted reset before
the input circuit is closed or as a result of
the reset button being overridden.
If the position of the operating mode
selector switch (mode) is changed during
operation, an error message will be
triggered; the safety contacts on K1
open. This fault condition can only be
rectified by switching the supply voltage
on the safety relay PNOZ s4 (K1) off and
then on again.
Pilz products
Number
Designation
Order number
1
PNOZ s4
750 104
1
PNOZ s7.1
750 167
2
PNOZ s7.2
750 177
1
PITestop Set1.1
400 410
