Burkert 6520 NARMUR User manual

Operating Instructions
Bedienungsanleitung
Instructions de Service
Type 6520 NAMUR
Valve with 24 V connection
Ventil mit 24 V-Anschluß
Vanne avec raccordement 24 V

We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous resérve de modification techniques.
© 2002 Bürkert Werke GmbH & Co. KG
Operating Instructions 0606/10_EU-ML_00800608

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Type 6520 NAMUR Valve with 24 V connection
CONTENTS
1 GENERAL NOTES .......................................................................................................................................... 2
1.1 Symbols ......................................................................................................................................... 2
1.2 General Safety instructions .................................................................................................. 2
2 GENERAL DESCRIPTION ......................................................................................................................... 3
2.1 Type 6520 NAMUR Valve with 24 V connection ......................................................... 3
3 GENERAL TECHNICAL DATA ................................................................................................................ 4
3.1 Type 6520 NAMUR with 24 V connection ..................................................................... 4
3.2 Valve construction ................................................................................................................... 4
3.3 Operation .................................................................................................................................... 5
3.4 Medium......................................................................................................................................... 5
4 INSTALLATION AND COMMISSIONING OF THE VALVE .................................................... 6
4.1 Mounting the valve / pneumatic position indicator ..................................................... 7
4.2 Measures to be taken before commissioning ................................................................ 7
4.3 Electrical connection of the Type 6520 NAMUR valve with the 24 V
connection .................................................................................................................................. 8
5 FAULTS.................................................................................................................................................................. 9

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To ensure that the device functions correctly, and will have a long service life,
please comply with the information in these Operating Instructions, as well as
the application conditions and permissible data given in the Type 6520 data
sheet:
• When planning the application of the device, and during its operation,
observe the general technical rules!
• Observe the relevant accident prevention and safety regulations applicable
for electrical equipment throughout the operation, maintenance and repair
of the device! Always switch off the voltage supply before working on the
system!
• Note that line connections and valves must not be loosened while the
system is under pressure
• Take suitable measures to prevent impairment due to improper use.
• If these instructions are ignored, no liability will be accepted from our side,
and the guarantee on the device and on accessories will become invalid!
1 GENERAL NOTES
In these Operating Instructions, the following symbols are used:
Indicates a working step that you have to carry on.
Indicates information which must be followed. Failure to do
this could endanger your health or the functionality of the
device..
ATTENTION!
NOTE Indicates important additional information, tips and
recommendations.
1.1 Symbols
1.2 General Safety instructions

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2 GENERAL DESCRIPTION
Type 6520 NAMUR valve for the control of process valves with electrical
connections, available with either a 24 V connection.
2.1 Type 6520 NAMUR Valve with 24 V connection
• Pilot-driven pneumatic valve with a piezo valve as the pilot control
• Very low switching and standby current

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NOTE Under normal conditions, the devices work maintenance-free.
• Drives: - Piezo drive,
• Valve housing with membrane and seat seals (5/2)
• Service ports 2 (B) / 4 (A) with change-over plate to MAMUR flange layout,
plus feed and drain connections 1, 3 and 5 with G 1/4 internal thread
• Can be installed in any position, preferably with connection at top
Operating voltage: 24 V DC ±10%
Pressure range: 2,5 to 7 bar
Flange: NAMUR flange
Standby current: < 150 µA at 24 V
Power dissipation: < 10 mW
Permissible temperature range
Ambient: - 20 to +55 ° C
Medium: - 20 to +50 ° C
Protection class: IP 65
The valve can be supplied in explosion protection class
to EN 50020, II 2G EEx ia IIC T6
3 GENERAL TECHNICAL DATA
3.1 Type 6520 NAMUR with 24 V connection
3.2 Valve construction

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5/2 way valve:
In standby position, pressure port 1 connected to outlet 2.
Outlet 4 vented
3/2 way valve with return of exhaust:
In standby position, pressure port 1 blocked, outlet 2 vented
into output 4
The integrated exhaust air feedback prevents the penetration of ambient air into
the spring recess of the drive.
NOTE Application in either 5/2 or 3/2 way type.
To convert from the 5/2 to the 3/2 way model, or vice versa,
turn the change-over plate through 180°. When using as a 3/2
way valve, close off outlet 3 with the supplied G1/4 locking
screw. This ensures that the integrated feedback of outgoing
air functions correctly.
3.3 Operation
• Filtered compressed air, oiled or unoiled (max. particle size 5 µm)
• Sealing material: PB = Polyurethane and NBR
• Permissible temperature range: - 20 to +50 ° C
• Operating pressure range: 2,5 to 7 bar
ATTENTION! Note the permissible pressure range given on the rating
plate. Pressure difference between port 1 and 3/5 > 2,5 bar.
The valve is driven using instrument air, and serves as a 3/2 or 5/2-way valve
for the switching of non-inflammable media. The valve must only be operated in
the mounted condition, unless it is ensured that explosive atmospheres can
only rarely penetrate the interior of the valve, and only for short periods.
3.4 Medium

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Work on the device should only be carried out by specialist staff using the
correct tools!
Before carrying out work on the system, always switch off the voltage
supply!
Implement the pressure supply with as large a volume as possible (even for
pilot devices such as pressure regulators, service units etc.);
Operating pressure ≥2,5 bar;
Minimum flow rate 270 l/min at P connection of valve 1)1)
1)1)
1)
Before mounting the valve, clean out the pipelines!
Note, that contamination impairs the function of the PIEZO pilot valve!
Where necessary, fit a dirt trap upstream to protect from faults.
Ensure that the operating conditions agree with the performance data of
the unit!
Avoid back pressure in the exhaust channels by means of a large-volume
silencer!
4 INSTALLATION AND COMMISSIONING OF THE VALVE
Line connections and valves must not be loosened while
the system is under pressure !
There are no replacement parts for the unit! In case of fault,
please return the unit to the manufacturer.
ATTENTION!
1) In the case of version with reduced flow rate
(ID no. 141 721 Z; ID no. 141 72 S), the flow rate is reduced to 150 l/min.

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Check all connections, voltages and the operational pressure!
Ensure that the max. operating data (see rating plate) id not exceeded!
Check the correct connection of ports 1 and 3 or 5 respectively in
accordance with the regulations. On no account must these be reversed!
Mount the valve directly onto the NAMUR connection flange of the
pneumatic drive using the 2 supplied M5 x 35 screws.
Fig. 3: Mounting the valve / Pneumatic position indicator
M3 x 35 screws
NOTE The supplied coded pin ensures that the device can only be
mounted in the foreseen position. (guarantees the pre-defined
direction of operation of the drive).
24 V connection
Indicator pin to show the pneumatic position
In an unswitched valve, the red indicator pin can be
pressed in. If the valve is switched, the indicator pin
travels out, and remains in this position. Every time a
functional check is carried out, this pin must be pressed
in again.
Identification label (removable for marking / inscription)
Port 14
• Not used in standard model
• Used as an control air boost connection and as a
connection for pneumatic controls
4.2 Measures to be taken before commissioning
4.1 Mounting the valve / pneumatic position indicator

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4.3 Electrical connection of the Type 6520 NAMUR valve with the 24
V connection
Connection:
Terminal 1124 V
Terminal 13 0 V / Ground