Emergency Stop 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]
2011-10
2.1-14
2.1
PL e of EN ISO 13849-1, SIL 3 of EN 62061
PNOZ s5 - Safe standstill of two drives
Features
Dual-channel operation with detection
of shorts across contacts
Monitored reset with falling edge
Safe standstill of two drives after E-
STOP
Contact expansion through positive-
guided contactors
Feedback loop to monitor contact ex-
pansion
Stop category 1 in accordance with
EN 60204-1
Description
Both drive controllers A2 and A3 have
different braking times, so it must be
possible to separate them from the mains
independently in terms of time.
E-STOP function
When the E-STOP pushbutton S3 is
operated, both the drives and the supply to
the drives are shut down after a delay time.
When the E-STOP pushbutton S3 is
operated, the input circuit on the safety
relay PNOZ s5 (K2) is interrupted, safety
contacts 13-14 and 23-24 on K2 open
immediately and trigger a “fast stop” at both
the drive controllers A2 and A3.
The delay-on de-energisation safety contact
37-38 on K2 switches off contactors KM3
and KM4 after a delay. In this way, the drive
controller A2 is isolated from the energy
supply (mains) after a delay. The delay-on
de-energisation time is set on the safety
relay PNOZ s5 (K2). As a result the input
circuit on safety relay PNOZ s9 (K3) is
interrupted, the safety contacts on K3
switch off after a delay. The delay-on de-
energisation contact 17-18 on K3 switches
off contactors KM5 and KM6 after a delay.
In this way, the drive controller A3 is isolated
from the energy supply (mains) after a delay.
The delay-on de-energisation time is set on
the safety relay PNOZ s9 (K3).
Settings on the unit
The connector between the safety relays
PNOZ s5 (K2) and PNOZ s9 (K3) must be
connected.
The operating mode selector switch
(mode) on the safety relay PNOZ s5 (K2)
must be set to “Monitored reset, falling
edge with detection of shorts across
contacts (In2-)“.
The delay time on the safety relays
PNOZ s5 (K2) and PNOZ s9 (K3) is set
using the time selector switch t[s] and the
factor selector switch n.
The operating mode selector switch
(mode) on the safety relay PNOZ s9 (K3)
must be set to “Delay-on de-
energisation, not retriggerable”.
Start/reset
The safety relay PNOZ s5 (K2) can be
started by pressing reset button S4 if:
E-STOP pushbutton S3 has not been
operated and
Contactors KM3, KM4, KM5 and KM6
have dropped out and
Pilz products
Number
Designation
Order number
1
PNOZ s5
750 105
1
PNOZ s9
750 109
1
PITestop Set1.1
400 410
the feedback loop on safety relay PNOZ
s9 (K3) is closed.
Feedback loop
The positive-guided N/C contacts on
contactors KM3, KM4, KM5 and KM6 are
monitored in feedback loop S12-S34 of
safety relay PNOZ s5 (K2). The feedback
loop on the safety relay PNOZ s5 (K2) is
connected to the feedback loop on the
safety relay PNOZ s9 (K3).
