Pilz PNOZ X4 Data Sheet
NOT-AUS Schaltgerät, Schutztürwächter
Up to Category 4, EN 954-1
PNOZ X4
Safety relay for monitoring E-STOP
pushbuttons, safety gates and light
barriers.
Approvals
PNOZ X4
Unit features
` Positive-guided relay outputs:
– 3 safety contacts (N/O), instanta-
neous
– 1 auxiliary contact (N/C), instan-
taneous
` Connection options for:
– E-STOP pushbutton
– Safety gate limit switch
– Reset button
– Light barriers
` LED indicator for:
– Switch status channel 1/2
– Supply voltage
` See order reference for unit types
Unit description
The safety relay meets the requirements of EN 60204-1 and IEC 602041 and may be used in applications with
` E-STOP pushbuttons
` Safety gates
` Light barriers
Safety features
` The circuit is redundant with built-in
self-monitoring.
` The safety function remains effecti-
ve 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.
` The tranformer is short circuit-
proof. An electronic fuse is used on
a DC supply.
Block diagram
~
Power
=
S11 S12A1 A2
Feed-
back
Y1 Y2
The relay conforms to the following
safety criteria:
S21 S22
InputInput
S52
Input
S33 S34
Reset/
Start
Y36 Y37
Reset/
Start
K1
K2
23 33 41
13
14 24 34 42
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-2-128-01/05
NOT-AUS Schaltgerät, Schutztürwächter
Up to Category 4, EN 954-1
PNOZ X4
Function description
` Single-channel operation: no red-
undancy in the input circuit, earth
faults in the reset and input circuit
are detected.
` Dual-channel operation without de-
tection 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
Timing diagram
1 2
POWER
Reset/Start
Input
Output safe
Output aux.
t1 t2
t1 t2
the reset circuit too.
` 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,
– shorts between contacts in the
input circuit.
` Automatic start: Unit is active once
the input circuit has been closed.
ab
t1
t1
t2
t2
` Manual reset: Unit is active once
the input circuit is closed and then
the reset circuit is closed.
` Monitored reset: Unit is active once
the input circuit is closed and once
the reset circuit is closed after the
waiting period has elapsed
(see technical details).
` Increase in the number of available
contacts by connecting contact expander modules or external contactors/relays.
3
t1 t2 t1 t2t3 t3
Key
` Power: Supply voltage
` Reset/start: Reset circuit S33-S34
` Input: Input circuits S11-S12, S21-
S22, S52
` Output safe: Safety outputs 13-14,
23-24, 33-34
Wiring
Please note:
` Information given in the “Technical
details” must be followed.
` Outputs 13-14, 23-24, 33-34 are
safety contacts, output 41-42 is an
auxiliary contact (e.g. for display).
` To prevent contact welding, a fuse
should be connected before the
output contacts (see technical details).
` Calculation of the max. cable runs
in the input circuit:
l
max
R
lmax
=
I
max
Rl / km
` Output aux: Auxiliary contacts 41-
42
` c: Automatic reset
` d: Manual reset
` e: Monitored reset
` a: Input circuit closes before reset
circuit
R
= max. overall cable resi-
lmax
stance (see technical details)
/ km = cable resistance/km
R
l
` Use copper wire that can withstand
60/75 °C.
` Sufficient fuse protection must be
provided on all output contacts with
capacitive and inductive loads.
` b: Reset circuit closes before input
circuit
: Switch-on delay
` t
1
` t2: Delay-on de-energisation
: Waiting period
` t
3
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
NSG-D-2-128-01/05Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
-2
NOT-AUS Schaltgerät, Schutztürwächter
Up to Category 4, EN 954-1
PNOZ X4
Preparing for operation
` Supply voltage
Supply voltage AC DC
A1
A2
L1
N
PE
` Input circuit
Input circuit Single-channel Dual-channel
E-STOP
without detection of shorts across
contacts
S21
S22
S11
S12
S52
S1
S21
S22
E-STOP
with detection of shorts across contacts
S11
S52
Safety gate
without detection of shorts across
contacts
S21
S22
S11
S12
S52
S1
S21
S22
S11
S12
S52
A1
A2
S11
S12
S52
S11
S21
S22
S12
S1
L+
L-
S1
S1
S2
Safety gate
with detection of shorts across contacts
Light barrier with detection of shorts
across contacts via ESPE
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
S21
S22
S11
S52
S11
S12
S21
S22
S12
S52
S1
NSG-D-2-128-01/05
S2
24 V DC
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