Pilz PU3Z User manual

PU3Z
Operating Manual-19093-EN-07
}Safe monitoring relays

Preface
This document is the original document.
All rights to this documentation are reserved by Pilz GmbH & Co. KG. Copies may be made
for the user's internal purposes. Suggestions and comments for improving this documenta-
tion will be gratefully received.
Pilz®, PIT®, PMI®, PNOZ®, Primo®, PSEN®, PSS®, PVIS®, SafetyBUS p®,
SafetyEYE®, SafetyNET p®, the spirit of safety® are registered and protected trademarks
of Pilz GmbH & Co. KG in some countries.
SD means Secure Digital

Contents
Operating Manual PU3Z
19093-EN-07 | 3
Introduction ............................................................................................................................5
Validity of documentation.......................................................................................................... 5
Using the documentation .......................................................................................................... 5
Definition of symbols................................................................................................................. 5
Safety ...................................................................................................................................... 6
Intended use ............................................................................................................................. 6
Safety regulations ..................................................................................................................... 6
Safety assessment ................................................................................................................... 6
Use of qualified personnel ........................................................................................................ 7
Warranty and liability ................................................................................................................ 7
Disposal .................................................................................................................................... 7
For your safety.......................................................................................................................... 7
Unit features ...........................................................................................................................7
Safety features ....................................................................................................................... 8
Block diagram/terminal configuration ................................................................................. 9
Types: AC ................................................................................................................................. 9
Types: DC................................................................................................................................. 9
Function description ............................................................................................................. 10
Operating modes ...................................................................................................................... 11
Timing diagram ......................................................................................................................... 12
Automatic start (S33-S34 linked) .............................................................................................. 12
Installation ..............................................................................................................................13
Wiring ......................................................................................................................................13
Preparing for Operation ........................................................................................................ 14
Operation ................................................................................................................................15
Status indicators ....................................................................................................................... 15
Faults – Interference .............................................................................................................. 16
Dimensions in mm .................................................................................................................16
Technical details ....................................................................................................................17
Safety characteristic data ......................................................................................................... 22
Supplementary data ..............................................................................................................23
Service life graph ...................................................................................................................... 23

Contents
Operating Manual PU3Z
19093-EN-07 | 4
Order reference ......................................................................................................................23
EC declaration of conformity ................................................................................................ 24

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Operating Manual PU3Z
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Introduction
Validity of documentation
This documentation is valid for the product PU3Z. It is valid until new documentation is pub-
lished.
This operating manual explains the function and operation, describes the installation and
provides guidelines on how to connect the product.
Using the documentation
This document is intended for instruction. Only install and commission the product if you
have read and understood this document. The document should be retained for future ref-
erence.
Definition of symbols
Information that is particularly important is identified as follows:
DANGER!
This warning must be heeded! It warns of a hazardous situation that poses
an immediate threat of serious injury and death and indicates preventive
measures that can be taken.
WARNING!
This warning must be heeded! It warns of a hazardous situation that could
lead to serious injury and death and indicates preventive measures that can
be taken.
CAUTION!
This refers to a hazard that can lead to a less serious or minor injury plus
material damage, and also provides information on preventive measures
that can be taken.
NOTICE
This describes a situation in which the product or devices could be dam-
aged and also provides information on preventive measures that can be
taken. It also highlights areas within the text that are of particular import-
ance.

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Operating Manual PU3Z
19093-EN-07 | 6
INFORMATION
This gives advice on applications and provides information on special fea-
tures.
Safety
Intended use
The voltage monitoring relay operates as a device for the safe monitoring of 3-phase sup-
plies with no voltage applied with neutral conductor. The three-phase network must be
earthed in the star point. It may be used in
}Safety circuits in accordance with EN60204-1
The following is deemed improper use in particular
}Any component, technical or electrical modification to the product,
}Use of the product outside the areas described in this operating manual,
}Use of the product outside the technical details (see Technical details).
NOTICE
EMC-compliant electrical installation
The product is designed for use in an industrial environment. The product
may cause interference if installed in other environments. If installed in other
environments, measures should be taken to comply with the applicable
standards and directives for the respective installation site with regard to in-
terference.
Safety regulations
Safety assessment
Before using a device, a safety assessment in accordance with the Machinery Directive is
required.
The product as an individual component fulfils the functional safety requirements in accord-
ance with EN ISO 13849 and EN 62061. However, this does not guarantee the functional
safety of the overall plant/machine. To achieve the relevant safety level of the overall plant/
machine’s required safety functions, each safety function needs to be considered separ-
ately.

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Operating Manual PU3Z
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Use of qualified personnel
The products may only be assembled, installed, programmed, commissioned, operated,
maintained and decommissioned by persons who are competent to do so.
A competent person is a qualified and knowledgeable person who, because of their train-
ing, experience and current professional activity, has the specialist knowledge required. To
be able to inspect, assess and operate devices, systems and machines, the person has to
be informed of the state of the art and the applicable national, European and international
laws, directives and standards.
It is the company’s responsibility only to employ personnel who
}Are familiar with the basic regulations concerning health and safety / accident prevention,
}Have read and understood the information provided in the section entitled Safety
}Have a good knowledge of the generic and specialist standards applicable to the specific
application.
Warranty and liability
All claims to warranty and liability will be rendered invalid if
}The product was used contrary to the purpose for which it is intended,
}Damage can be attributed to not having followed the guidelines in the manual,
}Operating personnel are not suitably qualified,
}Any type of modification has been made (e.g. exchanging components on the PCB
boards, soldering work etc.).
Disposal
}In safety-related applications, please comply with the mission time TM in the safety-related
characteristic data.
}When decommissioning, please comply with local regulations regarding the disposal of
electronic devices (e.g. Electrical and Electronic Equipment Act).
For your safety
The unit meets all the necessary conditions for safe operation. However, please note the
following:
}Note for overvoltage category III: If on the device there are voltages higher than 300 V
measured to the earth potential, connected control elements and sensors must have a
rated insulation voltage of at least 600V.
Unit features
}Redundant measuring inputs for 3-phase AC circuits
}Positive-guided relay outputs:
– 3 safety contacts (N/O), instantaneous
– 1 auxiliary contact (N/C), instantaneous
}7 semiconductor outputs
}LED display for:
– Supply voltage

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– Error
– Status of measuring circuit
}Semiconductor outputs signal:
– Status of measuring circuit
– Error
}Feedback loop for monitoring external contactors
Safety features
The safety relay meets the following safety requirements:
}The circuit is redundant with built-in self-monitoring.
}The safety function remains effective 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.

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Block diagram/terminal configuration
Types: AC
}UB: 120 – 240 V AC; Order no. 775505
A1
Power
A2 S33
0V 24V Y41 Y42 Y43 Y44 Y46
Y45 FAULT
0 V 24 V
Start Input N
Input
L1
Input
L2
Input
L3
Input
Feed-
back
S34 Y4 Y5
Y1 Y2
N N* L1 L1* L2 L2* L3 L3* 13 23 33 41
14 24 34 42
**Insulation against the non-marked area and between the relay contacts: Basic insulation
(overvoltage category III), protective separation (overvoltage category II); at 250 V, 4 kV
***Insulation against the non-marked area and between the measurement connections:
L1(*), L2(*), L3(*): Basic insulation (overvoltage category III), protective separation (over-
voltage category II); at 600 V, 6 kV
Types: DC
}UB: 24 VDC; Order no. 775510
A1
Power
A2 S33
0V 24V Y41 Y42 Y43 Y44 Y45 Y46 FAULT
0 V 24 V
Start Input N
Input
L1
Input
L2
Input
L3
Input
Feed-
back
S34 Y4 Y5
Y1 Y2
N N* L1 L1* L2 L2* L3 L3* 13 23 33 41
14 24 34 42
**Insulation against the non-marked area and between the relay contacts: Basic insulation
(overvoltage category III), protective separation (overvoltage category II); at 250 V, 4 kV
***Insulation against the non-marked area and between the measurement connections:
L1(*), L2(*), L3(*): Basic insulation (overvoltage category III), protective separation (over-
voltage category II); at 600 V, 6 kV

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Function description
The voltage monitoring relay PU3Z operates as a threshold switch. It measures the three
phase voltages L1, L2, L3. The N/C contact of the contactor to be monitored must be con-
nected at the input circuit and the measuring voltages have to be connected to the measur-
ing circuit. The reset circuit must be closed. When the supply voltage is applied, the
"POWER” LED will light.
}Input circuit Y4-Y5 is open (contactor energised) or one of the measurements is greater
than the switching threshold Uf (see Technical details [ 17])
– The safety contacts 13-14, 23-24 and 33-34 are open.
– Auxiliary contact 41-42 is closed.
}Input circuit Y4-Y5 is closed (contactor de-energised) and all the measuring voltages are
smaller that the switching threshold Uf (see Technical details [ 17])
– The safety contacts 13-14, 23-24 and 33-34 are closed.
– Auxiliary contact 41-42 is open.
}Self test: An internal self test is carried out during initial commissioning and each time the
supply 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.
The status of the measuring circuits is displayed via the auxiliary outputs Y41 ... Y46 and
the relevant LEDs:
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)
Measuring voltage Input circuit Y4-Y5 Semiconductor out-
put
LED indicator
All the measuring
ranges are in the
range of
110…600VAC
and/or
64…346VAC
(against N)
Input circuit is open
or closed.
High signal at all the
semiconductor out-
puts
All the relevant LEDs
illuminate.
A measuring voltage
<110VAC and/or
64VAC (against N)
Input circuit is open
or closed.
Low signal at the rel-
evant semiconductor
output
The relevant LED
goes out.
All the measuring
voltages <Uf (see
Technical
details [ 17])
Input circuit is open
or closed.
Low signal at all the
semiconductor out-
puts
All the relevant LEDs
go out.