Pilz PNOZ x2 Data Sheet
E-STOP relays, safety gate monitors
Up to Category 4, EN 954-1
PNOZ X2
Safety relay for monitoring E-STOP
pushbuttons and safety gates.
Approvals
PNOZ X2
Unit features
` Positive-guided relay outputs:
2 safety contacts (N/O), instantaneous
` Connection options for:
– E-STOP pushbutton
– Safety gate limit switch
– Reset button
` 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
Safety features
The relay conforms to the following
safety criteria:
` 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 unit has an electronic fuse.
Block diagram
~
Power
=
S11 S12A1 A2
S21 S22
InputInput
S33 S34
Reset/
Start
13 23
K1
K2
14 24
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-2-053-11/04
E-STOP relays, safety gate monitors
Up to Category 4, EN 954-1
PNOZ X2
Function description
` Single-channel operation: no red-
undancy in the input circuit, earth
faults in the reset circuit are detected.
` Dual-channel operation with detec-
tion of shorts across contacts: redundant input circuit, detects
Timing diagram
Output safe
Key
` Power: Supply voltage
` Reset/start: Reset circuit S33-S34
` Input: Input circuits S11-S12, S21-
S22
– 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.
` Monitored reset: Unit is active once
the input circuit is closed and once
POWER
Reset/Start
Input
t
1
t
3
t
2
` Output safe: Safety contacts 13-14,
23-24
: Switch-on delay
` t
1
` t2: Delay-on de-energisation
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.
t
2
t
1
t
3
` t
: Waiting period
3
Wiring
Please note:
` Information given in the “Technical
details” must be followed.
` Outputs 13-14, 23-24 are safety
contacts.
` 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
= max. overall cable resi-
R
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.
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
NSG-D-2-053-11/04Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
-2
E-STOP relays, safety gate monitors
Up to Category 4, EN 954-1
PNOZ X2
Preparing for operation
` Supply voltage
Supply voltage AC DC
A1
A2
L1
N
` Input circuit
Input circuit Single-channel Dual-channel
E-STOP
without detection of shorts across
contacts
S21
S22
S11
S12
A1
S1
L+
E-STOP
with detection of shorts across contacts
Safety gate
with detection of shorts across contacts
S11
S12
S21
S22
A1
A2
S11
S21
S22
S12
S1
L+
L-
S1
S2
` Reset circuit
Reset circuit E-STOP wiring (single-channel)
Safety gate (single-channel)
Monitored reset
S33
S34
S3
E-STOP wiring (dual-channel)
Safety gate (dual-channel)
` Feedback loop
Feedback loop Automatic reset Monitored reset
Contacts from external contactors
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
S33
S34
S33
K5
S34
13 (23)
14 (24)
NSG-D-2-053-11/04
K6
K5
K6
S3
S3
L1
N
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