Pilz PNOZ ex Data Sheet
E-STOP relays, safety gate monitors
Category 4, EN 954-1
PNOZ Ex
Safety relay for monitoring E-STOP
pushbuttons and safety gates in potentially explosive atmospheres
Approvals
PNOZ Ex
Unit features
` Positive-guided relay outputs:
– 3 safety contacts (N/O), instanta-
neous
– 1 instantaneous auxiliary contact
(N/O) in the intrinsically safe area
– 1 instantaneous auxiliary contact
(N/O) for fusing in the intrinsically
safe area
– 1 instantaneous auxiliary contact
(N/C) in the non-intrinsically safe
area
` Connection options for:
– E-STOP pushbutton
– Safety gate limit switch
– Reset button
` LED indicator for:
– Switch status channel 1/2
– Supply voltage
` Ex area II (1)GD [EEx ia] IIB/IIC
` See order reference for unit types
Unit description
The safety relay meets the requirements of EN 60947-5-1, EN 60204-1
and VDE 0113-1 and may be used in
applications with
` E-STOP pushbuttons
` Safety gates
The safety relay provides an intrinsically safe output circuit and volt-free
contacts for potentially explosive areas (standards used: EN 50014 +A1-A2
and EN 50020).
The unit is suitable for non-contact
barriers (e.g. light curtains) because a
dynamic start is possible.
Safety features
The relay meets the following safety
requirements:
` The circuit is redundant with built-in
self-monitoring.
` The safety function remains effec-
tive in the case of a component failure.
` The correct opening and closing of
the safety function relays is tested
automatically in each on-off cycle.
Block diagram
A1 A2 13 23 33 41
S11 S12 S21 S22
~
=
Power
Feed-
back
Y1 Y2
Grey area = intrinsically safe area
Input
Y36 Y37
Reset/
Start
S12 S34
Reset/
Start
K1
K2
14 24 34 42
535463
64
S52 Y36
InputInput
Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
NSG-D-2-355-2006-08
E-STOP relays, safety gate monitors
Category 4, EN 954-1
PNOZ Ex
Function description
` Dual-channel operation with detec-
tion of shorts across contacts: redundant input circuit, detects
– earth faults in the reset and input
circuit,
– short circuits in the input circuit
and, with a monitored reset, in
the reset circuit too,
Timing diagram
1 2
POWER
Reset/Start
Input
Output safe
Output aux.
t1 t2
t1 t2
Key
` Power: Supply voltage
` Reset/start: Reset circuit S12-S34,
Y36-Y37, Y1-Y2
` Input: Input circuits S11-S12, S21-
S21, S52, Y36
` Output safe: Safety contacts 13-14,
23-24, 33-34
– shorts between contacts in the
input circuit.
` Automatic start: Unit is active once
the input circuit has been closed.
` Manual reset: Unit is active once
the input circuit is closed and then
the reset circuit is closed.
` M on it or ed re se t: Un i t i s ac ti ve on c e
– the input circuit is closed and
then the reset circuit is closed
ab
t1
t1
t2
t2
` Output aux: Auxiliary contacts 41-
42, 53-54, 63-64
` c: Automatic reset
` d: Manual reset
` e: Monitored reset
` a: Input circuit closes before reset
circuit
and opened again.
– the reset circuit is closed and
then opened again once the input circuit is closed.
` Increase in the number of available
contacts by connecting contact expander modules or external contactors/relays.
ab
t1
3
t2
t2
t1
` b: Reset circuit closes before input
circuit
: Switch-on delay
` t
1
` t2: Delay-on de-energisation
Wiring
Please note:
` Information given in the “Technical
details” must be followed.
` Sufficient fuse protection must be
provided on all output contacts with
capacitive and inductive loads.
` Outputs 13-14, 23-24, 33-34 are
safety contacts, outputs 41-42, 5354, 63-64 are auxiliary contacts
(e.g. for display).
` To prevent contact welding, a fuse
should be connected before the
output contacts (see technical details).
` Calculation of the max. cabling runs
in the input circuit:
l
max
R
lmax
=
I
max
Rl / km
R
= max. overall cable resist-
lmax
ance (see technical details)
/km = cable resistance/km
R
l
` Use copper wire that can withstand
60/75 °C.
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
NSG-D-2-355-2006-08Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
-2
E-STOP relays, safety gate monitors
Category 4, EN 954-1
PNOZ Ex
Preparing for operation
` Supply voltage
Supply voltage AC DC
A1
A2
L1
N
` Input circuit
Input circuit Single-channel Dual-channel
E-STOP
with detection of shorts across contacts
Y36 (S11)
S52
S11
S21
S22
S12
S1
Safety gate
with detection of shorts across contacts
Y36 (S11)
S52
S11
S12
S21
S22
S1
` Reset circuit
Reset circuit Reset from the non-intrinsically safe area Reset from the intrinsically safe area
Automatic reset
S12
S34
Y1
Y2
S2
Manual reset
Monitored reset
Y36
Y37
Y1
Y2
S12
S34
Y1
Y2
S12
S34
S3
S3
Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
Y1
Y2
S3
S12
S34
Y1
Y2
S3
S12
S34
Y36
Y37
NSG-D-2-355-2006-08
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