Pilz PU3Z Data Sheet
Safe monitoring relays
Voltage
PU3Z
Voltage monitoring relay for the safe
monitoring of 3-phase supplies
Approvals
PU3Z
Unit features
` Positive-guided relay outputs:
– 3 safety contacts (N/O), instanta-
neous
– 1 auxiliary contact (N/C), instan-
taneous
` 6 semiconductor outputs
` LED indicator for:
– Supply voltage
– Semiconductor output
– Status of measuring circuit
` Semiconductor outputs signal:
– Status of measuring circuit
` See order reference for unit types
Unit description
The voltage monitoring relay operates
as a device for the safe monitoring of
3-phase supplies. The unit meets the
requirements of EN 945-1 up to Category 4. It may be used with
` safety circuits in accordance with
VDE 0113 and EN 60204-1 (e.g. on
movable guards)
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.
` The unit has an electronic fuse.
Block diagram
A1 A2
~
Power
S33 S34
Reset/
Start
=
0 V 24 V
0V 24V Y41 Y42
Y4 Y5
Input
N N*
Input
Y43 Y44 Y45 Y46
L1 L1*
N
Input
L2 L2* L3 L3*
L1
L2
Input
Feed-
back
Y1 Y2 FAULT
13 23 33 41
L3
Input
K1
K2
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-2-243-2006-11
Safe monitoring relays
Voltage
PU3Z
Function description
` Automatic reset: 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.
` Self test: An internal self test is car-
ried out during initial commission-
voltage is switched off and on. The
process simulates switching all
measuring voltages on and then off
again. Provided no error occurs
during the self test, the unit will then
be ready for operation.
` Increase in the number of safety
contacts available by connecting
external contactors.
` The unit operates as a threshold
switch. The switching thresholds of
the three phase voltages L1, L2, L3
are 10 V and 110 VAC / 64 VAC
when measured against the neutral
conductor N.The status of the
measuring circuit is displayed via
the semiconductor outputs and the
relevant LEDs:
ing and each time the supply
Measuring voltage Semiconductor LED
L1 – L2 Y41 VL1-L2 (Y41)
L2 – L3 Y42 VL2-L3 (Y42)
L1 – L3 Y43 VL1-L3 (Y43)
L1 – N Y44 VL1-N (Y44)
L2 – N Y45 VL2-N (Y45)
L3 – N Y46 VL3-N (Y46)
Timing diagram
POWER
Input
110 (64 V AC)
U1 ... U6
Output semi FAULT
Voltage Hazard
Detection
10 V AC
0 V AC
Output safe
Output aux
Output semi
System Fault
Key
` Power: Supply voltage
` Input: Input circuitY4-Y5
` U1 ... U6: Phase voltages on the
measuring circuit L1-L1*, L2-L2*,
L3-L3*, N-N*
` Output safe: Safety contacts 13-14,
23-24, 33-34
` Output aux: Auxiliary contacts 41-
42
Wiring
` Output semi: Semiconductor out-
puts Y41, Y42, Y43, Y44, Y45, Y46
indicate the status of the measuring
circuit
` Voltage Hazard Detection: LED
lights when there is a measuring
voltage of >10 VAC, although the
input circuit is closed
` System Fault: LED on: Open circuit
on at least one measuring circuit or
internal error
` Output semi FAULT: "FAULT" sem-
iconductor conducts when a "Voltage Hazard Detection" error or
"System Fault" occurs
Please note:
` Information given in the “Technical
details” must be followed.
Telephone: +49 711 3409-0, Telefax: +49 711 3409-133, E-Mail: pilz.gmbh@pilz.de
` Outputs 13-14, 23-24, 33-34 are in-
stantaneous safety contacts, outputs are delay-on de-energisation
safety contacts, output 41-42 is an
instantaneous auxiliary contact
(e.g. for display).
NSG-D-2-243-2006-11Pilz GmbH & Co. KG, Sichere Automation, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
-2
Safe monitoring relays
Voltage
PU3Z
` To prevent contact welding, a fuse
should be connected before the
output contacts (see technical details).
` Use copper wire that can withstand
60/75 °C.
` Sufficient fuse protection must be
provided on all output contacts with
capacitive and inductive loads.
` To meet the requirements of the
safety circuits, separate wires in
separate multicore cables must be
used for the measuring voltages L1,
L2, L3, N and the measuring voltages L1*, L2*, L3*, N*.
` Connect the measuring voltages L1
and L1*, L2 and L2* and L3 and L3*,
N and N* to separate terminals on
the plant, so that at least one measuring voltage will be present if a terminal screw should come away
unintentionally (single fault tolerance).
` Always connect the neutral con-
ductors N and N* to the same potential, e.g. neutral conductor on
the three-phase supply, earth connection.
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-2-243-2006-11
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