Burkert 8697 User Manual [en, de, fr]
Type 8697
Pneumatic Control Unit
Pneumatische Ansteuerung
Unité de commande pneumatique
Operating Instructions
Bedienungsanleitung
Manuel d‘utilisation
We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous réserve de modifications techniques.
© 2011- 2013 Bürkert Werke GmbH
Operating Instructions 1305/01_EU-ml_00810081 / Original DE
Type 8697
1. OPERATING INSTRUCTIONS ...................................................................4
1.1. Symbols ..............................................................................................4
1.2. Definition of term / abbreviation ....................................................4
2. AUTHORIZED USE .........................................................................................5
2.1. Restrictions ........................................................................................5
2.2. Designs with explosion protection ............................................... 5
3. BASIC SAFETY INSTRUCTIONS .............................................................6
4. GENERAL INFORMATION ...........................................................................7
4.1. Contact address ............................................................................... 7
4.2. Warranty ............................................................................................. 7
4.3. Trademarks ........................................................................................ 7
4.4. Information on the internet .............................................................7
5. DESCRIPTION OF SYSTEM .......................................................................8
5.1. Configuration and function.............................................................8
6. TECHNICAL DATA ...........................................................................................9
6.1. Conformity .........................................................................................9
6.2. Standards ........................................................................................... 9
6.3. Licenses .............................................................................................9
6.4. Operating conditions .....................................................................10
6.5. Mechanical data .............................................................................10
6.6. Type label (example) ......................................................................10
6.7. Pneumatic data ...............................................................................11
6.8. Electrical data..................................................................................11
7. INSTALLATION ............................................................................................... 12
7.1. Safety instructions .........................................................................12
7.2. Installation on process valves of series 21xx ...........................13
7.3. Installation on process valves of series 20xx ...........................15
7.4. Rotating the actuator module ......................................................18
7.5. Rotating the Pneumatic Control Unit for process valves
belonging to series 20xx .......................................................................19
8. FLUID INSTALLATION ................................................................................20
8.1. Safety instructions .........................................................................20
8.2. Installing the process valve ..........................................................21
8.3. Pneumatic connection of the Pneumatic Control Unit ..........21
9. ELECTRICAL INSTALLATION .................................................................. 22
9.1. Safety instructions .........................................................................22
9.2. Electrical installation with cable gland ......................................22
9.3. Electrical installation with circular plug-in connector ............25
9.4. Display elements: End position LED yellow .............................26
9.5. Adjustment of the micro switches or the proximity
switches (option) ............................................................................27
10. SAFETY POSITIONS ............................................................................... 28
11. ACCESSORIES ...........................................................................................28
12. DISASSEMBLY ............................................................................................ 29
12.1. Safety instructions .......................................................................29
12.2. Disassembly the Pneumatic Control Unit ...............................29
13. PACKAGING, TRANSPORT, STORAGE .......................................... 30
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3
Type 8697
Operating instructions
1. OPERATING INSTRUCTIONS
The operating instructions describes the entire life cycle of the device.
Keep these instructions in a location which is easily accessible to
every user, and make these instructions available to every new owner
of the device.
The operating instructions contain important safety
information.
Failure to observe these instructions may result in hazardous
situations.
▶ The operating instructions must be read and understood.
1.1. Symbols
DANGER!
Warns of an immediate danger.
▶ Failure to observe the warning will result in a fatal or serious injury.
WARNING!
Warns of a potentially dangerous situation.
▶ Failure to observe the warning may result in serious injuries or
death.
CAUTION!
Warns of a possible danger.
▶ Failure to observe this warning may result in a moderate or
minor injury.
NOTE!
Warns of damage to property.
▶ Failure to observe the warning may result in damage to the
device or the equipment.
Indicates important additional information, tips and
recommendations.
refers to information in these operating instructions or in
other documentation.
▶ Indicates an instruction to prevent risks.
→ Designates a procedure which you must carry out.
1.2. Definition of term / abbreviation
The term “device” used in these instructions always stands for the
Pneumatic Control Unit Type 8697.
The abbreviation “Ex” used in these instructions always stands for
“explosion-protected”.
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Type 8697
Authorized use
2. AUTHORIZED USE
Non-authorized use of the Pneumatic Control Unit Type
8697 may be a hazard to people, nearby equipment and the
environment.
• The device is designed to be mounted on pneumatic actuators
of process valves for the control of media.
• Do not expose the device to direct sunlight.
• Use according to the authorized data, operating conditions and
conditions of use specified in the contract documents and operating instructions. These are described in the chapter entitled
“6. Technical data”.
• The device may be used only in conjunction with third-party
devices and components recommended and authorized by
Bürkert.
• In view of the large number of options for use, before installation, it is essential to study and if necessary to test whether the
Pneumatic Control Unit is suitable for the actual use planned.
• Correct transportation, correct storage and installation and
careful use and maintenance are essential for reliable and faultless operation.
• Use the Pneumatic Control Unit Type 8697 only as intended.
2.1. Restrictions
If exporting the system/device, observe any existing restrictions.
2.2. Designs with explosion
protection
DANGER!
Explosion hazard.
Improper use in a potentially explosive atmosphere represents an
explosion hazard.
▶ Observe the information in the EC Declaration of Conformity as well.
▶ For designs with Ex approval, the information in the EC-Type
Examination Certificate and the additional instructions of Type 8697
must also be observed.
2.2.1. Ex approval
The Ex approval is only valid if the modules and components authorized by Bürkert are used as described in the additional instructions
for Type 8697.
The Pneumatic Control Unit may be used only in combination with the
additional components released by Bürkert, otherwise the Ex approval
will be voided!
If any unauthorized changes are made to the device, modules or components, the Ex approval will also be voided.
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Type 8697
Basic safety instructions
3. BASIC SAFETY
INSTRUCTIONS
These safety instructions do not make allowance for any
• contingencies and events which may arise during the installation,
operation and maintenance of the devices.
• local safety regulations, whereby the operator is responsible for their
compliance, by the installation personnel too.
DANGER!
Risk of injury from high pressure in the equipment/device.
▶ Before working on equipment or device, switch off the pressure
and deaerate/drain lines.
Risk of electric shock.
▶ Before reaching into the device, switch off the power supply and
secure to prevent reactivation.
▶ Observe applicable accident prevention and safety regulations
for electrical equipmen.
General hazardous situations.
To prevent injury, ensure:
▶ That the system cannot be activated unintentionally.
▶ Installation and repair work may be carried out by authorized
technicians only and with the appropriate tools.
▶ After an interruption in the power supply or pneumatic supply,
ensure that the process is restarted in a defined or controlled
manner.
▶ The device may be operated only when in perfect condition and
in consideration of the operating instructions.
▶ The general rules of technology apply to application planning and
operation of the device.
To prevent damage to property of the device, ensure:
▶ Do not feed any aggressive or flammable media into the pressure
supply connection.
▶ Do not feed any liquids into the pressure supply connection.
▶ Do not put any loads on the body (e.g. by placing objects on it
or standing on it).
▶ Do not make any external modifications to the device bodies.
The Pneumatic Control Unit Type 8697 was developed with
due consideration given to the accepted safety rules and
is state-of-the-art. Nevertheless, dangerous situations may
occur.
Failure to observe this operating manual and its operating instructions
as well as unauthorized tampering with the device release us from
any liability and also invalidate the warranty covering the devices and
accessories.
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Type 8697
General information
4. GENERAL INFORMATION
4.1. Contact address
Germany
Bürkert Fluid Control Systems
Sales Center
Chr.-Bürkert-Str. 13-17
D-74653 Ingelfingen
Tel. : 07940 - 10 91 111
Fax: 07940 - 10 91 448
E-mail: info@de.burkert.com
International
Contact addresses are found on the final pages of the printed operating manual.
You can also find information on the Internet under:
www.burkert.com
4.2. Warranty
The warranty is only valid if the device is used as authorized in accordance with the specified application conditions.
4.3. Trademarks
Brands and trademarks listed below are trademarks of the corresponding companies / associations / organizations
Loctite Henkel Loctite Deutschland GmbH
4.4. Information on the internet
The operating instructions and data sheets for Type 8697 can be found
on the Internet at:
www.burkert.com
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7
Type 8697
Description of system
5. DESCRIPTION OF SYSTEM
5.1. Configuration and function
The Pneumatic Control Unit Type 8697 can control single or doubleacting process valves. The Pneumatic Control Unit Type 8697 has been
optimized for integrated, modular installation on process valves of the
21xx series (Element actuator size ∅ 50). The module configuration
permits a variety of expansion steps.
For installation on the 20xx series there is a special model which is
described in Chapter “5.1.2”.
5.1.1. Pneumatic Control Unit for integrated
installation on 21xx series (Element
actuator size ∅ 50)
Transparent cap
Pressure limiting valve
(for protection against too high
internal pressure in case of
error)
Pilot air port
label: 1
Exhaust air connection label: 3
Cable gland M16 x 1.5 or Circular plug-in connector M12 x 1
Fig. 1: Configuration and function (1)
Optical position indicator:
The device status is displayed on the Pneumatic Control Unit (yellow
mark).
Option: Electrical position feedback
Optionally mechanical limit switches (micro switches) or inductive
proximity switches can measure the valve position.
View without transparent cap:
Assembly shaft for
precision adjustment
of the switch cams
(only for model with
inductive proximity
switches)
Opening for optical
position indicator
Screw terminals
Fastening screws (2x)
Fig. 2: Configuration and function (2)
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Type 8697
Technical data
5.1.2. Model for control of process valves
belonging to the 20xx series
A special model enables the Pneumatic Control Unit Type 8697 to be
attached to process valves belonging to the 20xx series.
This model has a different pneumatic connection module so that the
pilot air ports can be connected to the outside of the actuator.
Fastening screws (2x)
Pilot air outlet 2
Pilot air outlet 2
Fig. 3: Connection module for process valves, 20xx series
1
2
6. TECHNICAL DATA
6.1. Conformity
In accordance with the EC Declaration of conformity, the Pneumatic
Control Unit Type 8697 is compliant with the EC Directives.
6.2. Standards
The applied standards, which verify conformity with the EC Directives,
can be found on the EC-Type Examination Certificate and / or the EC
Declaration of Conformity.
6.3. Licenses
The product is approved for use in zone 1, 2, 21 and 22 in accordance
with ATEX directive 94/9/EC category 2 GD and 3GD.
Observe instructions on operation in an explosion-risk (Ex)
area.
Observe the ATEX additional instructions.
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Type 8697
Technical data
6.4. Operating conditions
WARNING!
Solar radiation and temperature fluctuations may cause malfunctions or leaks.
▶ If the device is used outdoors, do not expose it unprotected to
the weather conditions.
▶ Ensure that the permitted ambient temperature does not exceed
the maximum value or drop below the minimum value.
Ambient temperature
without pilot valve (feedback head) -20 °C – +60 °C
with pilot valve (control head) -10 °C – +55 °C
with ATEX approval see ATEX additional
instructions
Degree of protection IP65 / IP67 according to EN 60529
(only if cables, plugs and sockets have been
connected correctly and in compliance with
the exhaust air concept in chapter “8.2.
Installing the process valve”).
6.5. Mechanical data
Dimensions see data sheet
Body material external PPS, PC
Sealing material external EPDM
internal FKM
Stroke range of valve spindle Micro switch 4 – 36 mm
Proximity switch 2 – 36 mm
6.6. Type label (example)
Type - Control
8697 24 V/DC
single act Pilot 0,6
Pmax 7 bar 2 sw.mec.
Tamb -10°C - +55°C
S/N 001000
00185114
D-74653 Ingelfingen
CE
W14UN
Fig. 4: Example of type label
Control function - pilot valve
Nominal pressure - limit switch
Max. ambient temperature
Serial number - CE mark
Identification number
Bar code
10
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Type 8697
Technical data
6.7. Pneumatic data
Control medium neutral gases, air, Quality classes in accordance
with DIN ISO 8573-1
Dust content Class 5 max. particle size 40 μm,
max. particle density 10 mg/m
Water content Class 3 max. pressure dew point -20 °C or
min. 10 °C below the lowest operating
temperature
Oil content Class 5 max. 25 mg/m
3
Temperature range 0 – +50 °C
Pressure range 3 – 7 bar
Air output of pilot valve 7 I
/min
N
(for aeration and deaeration, QNn-value
according to definition for pressure
drop from 7 to 6 bar absolute)
Connections
21xx (Element) Plug-in hose connector ∅6 mm / ¼”
Socket connection G 1/8
20xx (Classic) Socket connection G 1/8
Connection M5 for connecting the
actuator
3
6.8. Electrical data
Connections Cable gland M16 x 1.5, wrench size 19
(clamping area 4 – 8 mm)
with screw terminals
for cable cross-sections 0.14 – 1.5 mm²
Circular plug-in connector M12 x 1, 8-pole
Supply voltage
Pilot valve 24 V DC ± 10 %, residual ripple 10 %
Power consumption
of pilot valve 1 W
Micro switch For maximum current load see table
Variant for safety extra-low voltage (0 – 48 V AC/DC)
24 V 48 V
resistive load and semi-conductor
load
inductive load (cos ϕ = 0,3) 2 A AC
Variant for low voltage (50 – 250 V AC/DC)
resistive load and semi-conductor
load
inductive load (cos ϕ = 0,3) 0,5 A AC
2 A AC
2 A DC
2 A AC
2 A DC
1,5 A AC
2 A DC
1 A DC
110/127 V 220/240 V
2 A AC
0,4 A DC
2 A AC
0,2 A DC
0,2 A AC
0,2 A DC
0,1 A DC
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Type 8697
Installation
Supply voltage
Proximity switches
3-wire PNP 10 – 30 V DC
max. 100 mA per proximity switch
2-wire 24 V DC
normally open 10 – 30 V DC max. 100 mA,
min. 3 mA per proximity switch,
Voltage drop< 5 V
Residual current < 0,6 mA
2-wire NAMUR 8,2 V DC, 1,2/2,1 mA
(actuated/not actuated)
Position feedback (option):
2x Micro switch (250 V AC)
2x Micro switch (24 V DC)
2x Proximity switch (24 V DC),
normally open PNP (3-wire)
2x Proximity switch NAMUR (8,2 V DC) (2-wire)
2x Proximity switch (24 V DC), normally open (2-wire)
7. INSTALLATION
Only for Pneumatic Control Unit without pre-assembled
process valve.
7.1. Safety instructions
DANGER!
Risk of injury from high pressure in the equipment/device.
▶ Before working on equipment or device, switch off the pressure
and deaerate/drain lines.
Risk of electric shock.
▶ Before reaching into the device, switch off the power supply and
secure to prevent reactivation.
▶ Observe applicable accident prevention and safety regulations
for electrical equipment.
WARNING!
Risk of injury from improper installation.
▶ Installation may be carried out by authorized technicians only and
with the appropriate tools.
Risk of injury from unintentional activation of the system and
an uncontrolled restart.
▶ Secure system from unintentional activation.
▶ Following installation, ensure a controlled restart.
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Type 8697
Installation
7.2. Installation on process valves of
series 21xx
Procedure:
1. Install switch spindle
Transparent cap
Pilot air ports
(plug-in hose con-
nectors with collets or
threaded bushings)
Actuator
Fig. 5: Installation of the switch spindle (1), 21xx series
→ Unscrew the transparent cap on the actuator and unscrew the
position display (yellow cap) on the spindle extension.
→ For version with plug-in hose connector, remove the collets (white
nozzles) from both pilot air ports (if present).
3
Maximum
distance
Fig. 6: Installation of switch spindle (2), 21xx series
NOTE!
Improper installation may damage the groove ring in the
guide element.
The groove ring is already be pre-assembled in the guide element
and must be “locked into position” in the undercut.
▶ When installing the switch spindle, do not damage the groove ring.
Switch spindle
Switch cam
Spacer sleeve
Groove ring
Guide element
max. 1 Nm
max. 5 Nm
Actuator cover
O-ring
Spindle extension
→ Push the switch spindle through the guide element.
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Type 8697
Installation
NOTE!
Screw locking paint may contaminate the groove ring.
▶ Do not apply any screw locking paint to the switch spindle.
→ To secure the switch spindle, apply some screw locking paint
(Loctite 290) in the tapped bore of the spindle extension in the
actuator.
→ Check that the O-ring is correctly positioned.
→ Screw the guide element to the actuator cover (maximum torque:
5 Nm).
→ Screw switch spindle onto the spindle extension. To do this, there
is a slot on the upper side (maximum torque: 1 Nm).
→ Push spacer sleeve onto the switch spindle up to the guide element.
Position switch cams on the switch spindle:
→ Push lower switch cam up to the spacer sleeve.
→ Push upper switch cam until 3 mm from the start of the switch
spindle.
Ensure that the distance between both switch cams is maximum
(see “Fig. 6”).
2. Install sealing rings
Pilot air ports
Caution:
Collets must not be
fitted !
Form seal
Installation of
the form seal
Fig. 7: Installing of the sealing rings, 21xx series
→ Pull the form seal onto the actuator cover (smaller diameter points
upwards).
→ Check that the O-rings are correctly positioned in the pilot air ports.
When the Pneumatic Control Unit is being installed, the collets
of the pilot air ports must not be fitted to the actuator.
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Type 8697
Installation
3. Installation of the Pneumatic Control Unit
Supports
Pilot air
ports
Fig. 8: Installation of the Pneumatic Control Unit, 21xx series
Fastening
screws
max. 0,5 Nm
→ Align the Pneumatic Control Unit until the supports of the Pneumatic
Control Unit can be inserted into the pilot air ports of the actuator
(see also “Fig. 8”).
→ Push the Pneumatic Control Unit, without turning it, onto the
actuator until no gap is visible on the form seal.
NOTE!
Too high torque when screwing in the fastening screw does
not ensure degree of protection IP65 / IP67.
▶ The fastening screws may be tightened to a maximum torque of
0.5 Nm only.
→ Attach the Pneumatic Control Unit to the actuator using the two
side fastening screws. In doing so, tighten the screws only handtight (maximum torque: 0.5 Nm).
7.3. Installation on process valves of
series 20xx
Procedure:
1. Install switch spindle
Transparent cap
Position indicator
Actuator
Fig. 9: Installation of the switch spindle (1), series 20xx
→ Unscrew the transparent cap on the actuator.
→ Using a hexagon socket key, unscrew the orange/yellow position
indicator from the inside of the actuator.
→ Press the O-ring downwards into the cover of the actuator (see
“Fig. 10”).
→ Manually screw the switch spindle (and the plugged-on guide
element) together with the plastic part onto the spindle of the
actuator, but do not tighten spindle yet.
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Type 8697
Installation
3
Maximum
distance
Fig. 10: Installation of the switch spindle (2), series 20xx
Switch spindle
Switch cam
Spacer sleeve
Groove ring
Guide element
O-ring
Actuator cover
Plastic part of the
switch spindle
Spindle (actuator)
→ Tighten the guide element with a wrench SW19 into the actuator
cover (torque: 8.0 Nm).
→ Tighten the switch spindle on the spindle of the actuator. To do
this, there is a slot on the upper side (torque: 1.0 Nm).
→ Push spacer sleeve onto the switch spindle up to the guide element.
Position switch cams on the switch spindle:
→ Push lower switch cam up to the spacer sleeve.
→ Push upper switch cam until 3 mm from the start of the switch
spindle.
Ensure that the distance between both switch cams is maximum
(see “Fig. 10”).
2. Installation of the Pneumatic Control Unit
Fastening screws
max. 0.5 Nm
Fig. 11: Installation of the Pneumatic Control Unit, series 20xx
→ Push the Pneumatic Control Unit onto the actuator.
→ Press the Pneumatic Control Unit all the way down as far as the
actuator and turn it into the required position.
Ensure that the pneumatic connections of the Pneumatic
Control Unit and those of the actuator are situated preferably
vertically one above the other (see “Fig. 11”).
If they are positioned differently, longer hoses may be required
other than those supplied in the accessory kit.
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Type 8697
Installation
NOTE!
Too high torque when screwing in the fastening screw does
not ensure degree of protection IP65 / IP67.
▶ The fastening screws may be tightened to a maximum torque of
0.5 Nm only.
→ Attach the Pneumatic Control Unit to the actuator using the two
side fastening screws. In doing so, tighten the fastening screws
hand-tight only (maximum torque: 0.5 Nm).
3. Installation of the pneumatic connection on the actuator
Pilot air outlet 2
Pilot air outlet 2
Upper pilot air port
Lower pilot air port
Fig. 12: Installation of the pneumatic connection, 20xx series
1
2
→ Screw the plug-in hose connectors onto the Pneumatic Control
Unit and the actuator.
→ Using the hoses supplied in the accessory kit, make the connection
between the Pneumatic Control Unit and the actuator with the following “Tab. 1: Pneumatic connection to actuator”.
NOTE!
Damage or malfunction due to ingress of dirt and moisture.
▶ To comply with degree of protection IP65 / IP67, connect the
pilot air outlet which is not required to the free pilot air port of the
actuator or seal with a plug.
“In rest position” means that the pilot valves of the Pneumatic
Control Unit Type 8697 are isolated or not actuated.
If the ambient air is humid, a hose can be connected between
pilot air outlet 22 of the Pneumatic Control Unit and the
unconnected pilot air port of the actuator for control function
A or control function B. As a result, the spring chamber of
the actuator is supplied with dry air from the vent duct of the
Pneumatic Control Unit.
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Type 8697
Installation
Control function Pneumatic connection Type 8697
with actuator
Process valve closed
in rest position
A
(by spring force)
Pilot air outlet
Type 8697
2
1
2
2
Pilot air port
actuator
lower pilot air port
of the actuator
should be connected to the
upper pilot air port
of the actuator
upper pilot air port
of the actuator
should be connected to the
lower pilot air port
Process valve open
in rest position
B
(by spring force)
2
1
2
2
of the actuator
Tab. 1: Pneumatic connection to actuator
7.4. Rotating the actuator module
The actuator module (Pneumatic Control Unit and actuator)
can be rotated for straight seat valves and angle seat valves
only.
The position of the connections can be aligned steplessly by rotating the
actuator module (Pneumatic Control Unit and actuator) through 360°.
Only the entire actuator module can be rotated. The Pneumatic Control Unit cannot be rotated contrary to the actuator.
The process valve must be in the open position for alignment
of the actuator module.
Actuator
module
Hexagon
Nipple
Series 21xx
Fig. 13: Rotating the actuator module
Hexagon
Nipple
Series 20xx
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Type 8697
Installation
DANGER!
Risk of injury from high pressure in the equipment/device.
▶ Before working on equipment or device, switch off the pressure
and deaerate/drain lines.
Procedure:
→ Clamp valve body in a holding device (only required if the process
valve has not yet been installed).
→ Control function A: Open process valve.
→ Using a suitable open-end wrench, counter the wrench flat on
the pipe.
→ Place suitable open-end wrench on the hexagon of the actuator.
WARNING!
Risk of injury from discharge of medium and pressure.
If the direction of rotation is wrong, the body interface may
become detached.
▶ Rotate the actuator module in the specified direction only (see
“Fig. 14”).
→ Rotate counter-clockwise (as seen from below) to bring the actuator
module into the required position.
Open-end wrench
Fig. 14: Rotating with open-end wrench
7.5. Rotating the Pneumatic
Control Unit for process valves
belonging to series 20xx
If the connecting cables or hoses cannot be fitted properly following
installation of the process valve, the Pneumatic Control Unit can be
rotated contrary to the actuator.
Procedure
→ Loosen the pneumatic connection between the Pneumatic Control
Unit and the actuator.
→ Loosen the fastening screws (hexagon socket wrench size 2.5).
→ Rotate the Pneumatic Control Unit into the required position.
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19
Fastening
screw (2x)
Pneumatic
Control Unit
Type 8697
Fluid installation
8. FLUID INSTALLATION
The dimensions of the Pneumatic Control Unit and the different complete device models, consisting of Pneumatic Control Unit, actuator
and valve, can be found in the relevant data sheets.
8.1. Safety instructions
Pneumatic
connection
Fig. 15: Rotating the Pneumatic Control Unit, series 20xx
NOTE!
Too high torque when screwing in the fastening screw does
not ensure degree of protection IP65 / IP67.
▶ The fastening screw may be tightened to a maximum torque of
0.5 Nm only.
Actuator
→ Tighten the fastening screws hand-tight only (maximum torque:
0.5 Nm).
→ Re-attach the pneumatic connections between the Pneumatic
Control Unit and the actuator. If required, use longer hoses.
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DANGER!
Risk of injury from high pressure in the equipment/device.
▶ Before working on equipment or device, switch off the pressure
and deaerate/drain lines.
WARNING!
Risk of injury from improper installation.
▶ Installation may be carried out by authorized technicians only and
with the appropriate tools.
Risk of injury from unintentional activation of the system and
an uncontrolled restart.
▶ Secure system from unintentional activation.
▶ Following installation, ensure a controlled restart.
Type 8697
Fluid installation
8.2. Installing the process valve
Thread type and dimensions can be found in the corresponding data
sheet.
→ Connect the valve according to the operating instructions for the
valve.
8.3. Pneumatic connection of the
Pneumatic Control Unit
Pilot air port
label: 1
DANGER!
Risk of injury from high pressure in the equipment/device.
▶ Before working on equipment or device, switch off the pressure
and deaerate/drain lines.
Procedure:
→ Connect the control medium to the pilot air port (1)
(3 to 7 bar, oil, water and dust-free instrument air).
→ Attach the exhaust airline or a silencer to the exhaust air port (3).
Important information for the problem-free functioning of the
device:
▶ The installation must not cause back pressure to build up.
▶ Select a hose for the connection with an adequate cross-section.
▶ The exhaust air line must be designed in such a way that no water
or other liquid can get into the device through the exhaust air port.
Exhaust air port
label: 3
Fig. 16: Pneumatic connection
Caution: (Exhaust air concept):
In compliance with degree of protection IP67, an exhaust air
line must be installed in the dry area.
Keep the adjacent supply pressure always at least 0.5 – 1
bar above the pressure which is required to move the actuator
to its end position.
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21
Type 8697
Electrical installation
9. ELECTRICAL INSTALLATION
Two kinds of connections are used for the electrical bonding of the
Pneumatic Control Unit:
• Cable gland
with cable gland M16 x 1.5 and screw terminals
• Multi-pole
with circular plug-in connector M12 x 1, 8-pole.
9.1. Safety instructions
DANGER!
Risk of electric shock.
▶ Before reaching into the device, switch off the power supply and
secure to prevent reactivation.
▶ Observe applicable accident prevention and safety regulations
for electrical equipment.
WARNING!
Risk of injury from improper installation.
▶ Installation may be carried out by authorized technicians only and
with the appropriate tools.
Risk of injury from unintentional activation of the system and
an uncontrolled restart.
▶ Secure system from unintentional activation.
▶ Following installation, ensure a controlled restart.
9.2. Electrical installation
with cable gland
DANGER!
Risk of electric shock.
▶ Before reaching into the device, switch off the power supply and
secure to prevent reactivation.
▶ Observe applicable accident prevention and safety regulations
for electrical equipment.
Procedure:
→ Open the Pneumatic Control Unit: unscrewing the transparent cap
in an anticlockwise direction.
→ Push the cables through the cable gland.
→ Connect the wires according to the model (options) of the Pneu-
matic Control Unit.
NOTE!
Damage or malfunction due to penetration of dirt and humidity.
To ensure degree of protection IP65 / IP67:
▶ Tighten the union nut on the cable gland according to the cable
size or dummy plugs used. (ca. 1,5 Nm).
▶ Screw the transparent cap in all the way.
→ Tighten union nut on the cable gland (torque approx. 1.5 Nm).
22
english
Type 8697
Electrical installation
Transparent cap
9.2.1. Connection diagram
with micro switches
(mechanical limit switches)
Terminal Configuration External circuit
Joint
Transparent cap
Fig. 17: Position of the seal in the transparent cap
→ Check that the seal is correctly positioned in the transparent cap.
→ Close the Pneumatic Control Unit (assembly tool: 674078
1) The assembly tool (674078) is available from your Bürkert sales
office.
1)
).
1
2
3
4
5
6
NO
NC
Joint
connection
NO
NC
Joint
connection
Terminal No
1
Micro switch
2
top
3
4
Micro switch
5
bottom
6
Tab. 2: Connection diagram with micro switches
Screw terminals
Fig. 18: Position of the screw terminals
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1
2
3
4
5
6
23
Type 8697
Electrical installation
9.2.2. Connection diagram
with three-wire proximity switches
(inductive limit switches)
Terminal Configuration External circuit
INI + (24 V DC)
1
Supply
INI GND
2
Supply
INI Top OUT
3
Output 1
INI Bottom OUT
4
Output 2
5
6
Valve control
0 / 24 V DC
Valve control
GND
5
6
Tab. 3: Connection diagram with three-wire proximity switches
Screw terminals
Fig. 19: Position of the screw terminals
3
Output 1
(24 V)
4
Output 2
(24 V)
2
1
GND
+24 V DC
0 / 24 V DC ± 10 %
Residual ripple 10 %
1
2
3
4
Terminal No
5
6
9.2.3. Connection diagram
with two-wire proximity switches
(inductive NAMUR limit switches)
Terminal Configuration External circuit
1 INI Top +
Explosion
protected area
2 INI Top -
3 INI Bottom +
NAMURSensor
4 INI Bottom -
Valve control
5
+
Valve control
6
GND
Tab. 4: Connection diagram with two-wire proximity switches
2) (Recommended by NAMUR) Observe the max. values of the
intrinsically safe circuits in the ATEX additional instructions.
3) Signal from barrier see PTB 07 ATEX 2048
Non-hazardous
area
1 / 3
+8,2 V DC
2 / 4
R
0 V
5
6
2)
3)
24
english
Type 8697
Electrical installation
Screw terminals
Fig. 20: Position of the screw terminals
1
2
3
4
Terminal No
5
6
9.2.4. Connection diagram with two-wire
proximity switches 24 V (inductive
limit switches, normally open)
Terminal Configuration External circuit
1 INI Top +
5
6
1 / 3
2 / 4
load
+
–
2 INI Top -
3 INI Bottom +
4 INI Bottom -
5
Valve control +
6 Valve control GND
Tab. 5: Connection diagram with two-wire proximity switches 24 V
Screw terminals
Fig. 21: Position of the screw terminals
1
2
3
4
Terminal No
5
6
9.3. Electrical installation with
circular plug-in connector
DANGER!
Risk of electric shock.
▶ Before reaching into the device, switch off the power supply and
secure to prevent reactivation.
▶ Observe applicable accident prevention and safety regulations
for electrical equipment.
→ Connect the pins.
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25
Type 8697
Electrical installation
Pin assignment
with three-wire proximity switches (inductive limit switches)
2
1
8
73
5
64
Fig. 22: Circular connector M12x1, 8-pole
Pin Wire color4)Configuration External circuit
1 white
brown
2
3 green
yellow
4
5 grey
6 pink
INI Bottom OUT
Output
INI Top OUT
Output
INI - (GND)
Supply
INI + (24 V DC)
Supply
Valve control 0
/ 24 V
Valve control
GND
5
6
1
Output 1
(24 V)
2
Output 2
(24 V)
3
4
GND
+24 V DC
0 / 24 V DC
± 10 %
Residual ripple
10 %
Tab. 6: Pin assignment with three-wire proximity switches
9.4. Display elements: End position
LED yellow
LED Top
LED Bottom
Fig. 23: End position LED yellow
4)
The indicated colors refer to the connecting cable available as an
accessory (919061)
26
english
Type 8697
Electrical installation
Version with
three-wire
proximity
switches
End position
top
is lit yellow is lit yellow goes out
End position
bottom
is lit yellow is lit yellow goes out
Fig. 24: End position LED yellow
The version with micro switches (mechanical limit switches) does
not include any LED to indicate position.
5) In the case of the version with 2-conductor initiators according
to NAMUR the LED function is inverse for technical reasons, i.e.
the LED glows when the end position is not reached and goes
out when the end position is reached.
Version with
two-wire
proximity
switches
LED Top
LED Bottom
Version with
two-wire
proximity
switches by
NAMUR (Ex
version)
5)
9.5. Adjustment of the micro switches
or the proximity switches (option)
DANGER!
Risk of electric shock.
▶ Before reaching into the device, switch off the power supply and
secure to prevent reactivation.
▶ Observe applicable accident prevention and safety regulations
for electrical equipment.
Procedure:
→ Open the Pneumatic Control Unit: unscrewing the transparent cap
in an anticlockwise direction.
→ Ensure that the distance between both switch cams is maximum.
(see “7. Installation”).
3
Maximum
distance
Fig. 25: Distance between the switch cams
Switch spindle
Switch cam
Spacer sleeve
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27
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