Burkert 8625 User Manual [en, de, fr]
Type 8625-2
Standard
Compact Temperature Controller
Kompakter Temperaturregler
Régulateur compact de température
Operating Instructions
Bedienungsanleitung
Manuel d‘utilisation
We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous réserve de modifications techniques.
© 2002 - 2009 Bürkert Werke GmbH
Operating Instructions 0912/07_EU-ML_00803261 / Original DE
CONTENTS
1 GENERAL NOTES................................................................................................................ 3
1.1 Symbols..................................................................................................................................................... 3
1.2 Safety notes .......................................................................................................................................... 3
1.3 Protection from damage by electrostatic charging .......................................... 4
2 FUNCTION ....................................................................................................................................... 5
3 APPLICATION AREA
4 TECHNICAL DATA
5 COMMISSIONING
5.1 Connection to the proportional valve ............................................................................. 8
5.2 Changing the cable outlet direction ................................................................................. 9
5.3 Connection configuration on the temperature controller
type 8625-2 .......................................................................................................................................... 10
5.4 First commissioning.................................................................................................................... 12
....................................................................................................... 6
................................................................................................................ 7
.................................................................................................................. 8
6 OPERATING THE TEMPERATURE CONTROLLER
TYPE...................................................................................................................................................... 13
6.1 Operating modes ............................................................................................................................ 13
6.2 Indications on the display ..................................................................................................... 14
6.3 Key allocation.................................................................................................................................... 15
6.4 Standard mode ................................................................................................................................. 16
6.4.1 Standard mode and internal setpoint............................................................. 16
6.4.2 Standard mode and external setpoint ........................................................... 17
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6.5 Manual mode ..................................................................................................................................... 18
6.6 Configuration mode ...................................................................................................................... 19
6.6.1 Menu of configuration mode ................................................................................. 21
6.6.2
UNIT
- setting of unit of temperature ............................................................... 22
8625-2 Standard - 1
6.6.3
MODE
- setting of setpoint mode ....................................................................... 23
AMPL
6.6.4
6.6.5
6.6.6
- setting of amplification K
INTG
- setting of reset time T
INV
- heating (non-inverted control)/cooling
...............................................................................
p
..........................................................................................
N
(inverted control) ............................................................................................... 31
6.6.7
ZERO
- zero point switch-off .................................................................................. 32
VALV
- adaptation of controller output signal ........................................... 33
END
- storage of the values ................................................................................... 35
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6.6.8
6.6.9
6.7 Settings on delivery .................................................................................................................... 36
7 ERROR MESSAGES....................................................................................................... 37
25
26
2 - 8625-2 Standard
1 GENERAL NOTES
1.1 Symbols
The following symbols are used in these operating instructions:
marks a work step that you must carry out.
ATTENTION!
NOTE
marks notes on whose non-observance your health or the
functioning of the device will be endangered.
marks important additional information, tips and
recommendations.
1.2 Safety notes
Please observe the notes in these operating instructions together with the
conditions of use and permitted data that are specified in the data sheets of the
proportional valve used and of the controller type 8625-2, in order that the
device will function perfectly and remain operable for a long time:
• Keep to standard engineering rules in planning the use of and operating the
device!
• Interference with the device is only allowed by specialist personnel using
suitable tools!
• Observe the current regulations on accident prevention and safety for
electrical devices during operation, maintenance and repair of the device!
• Before interfering with the system, always switch off the voltage!
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• Take suitable precautions to prevent unintended operation or damage by
unauthorized action!
• On non-observance of this note and unauthorized interference with the
device, we will refuse all liability and the guarantee on device and
accessories will become void!
8625-2 Standard - 3
1.3 Protection from damage by electrostatic charging
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EXERCISE CAUTION ON HAND-
This device contains electronic components that are sensitive to electrostatic
discharge (ESD). Contact to electrostatically charged persons or objects will
endanger these components. In the worst case, they will be immediately
destroyed or will fail after commissioning.
Observe the requirements of EN 100 015 - 1 in order to minimize the
possibility of, or avoid, damage from instantaneous electrostatic discharge.
Also take care not to touch components that are under supply voltage.
ATTENTION
LING !
ELECTROSTATICALLY
SENSITIVE
COMPONENTS/MODULES
4 - 8625-2 Standard
2 FUNCTIONS
The temperature controller type 8625-2 is designed, in connection with a proportional valve and a temperature sensor, to keep the temperature in a flowing
medium constant or to follow a given setpoint profile.
The functionality of the device is characterized by:
• Compact design, capable of direct installation on the proportional valve.
• May be combined with valve types 6022, 6023, 6024, 6223, 2832, 2834.
• Controller ouput directly to proportional valve in the form of a PWM signal;
this minimizes hysteresis and optimizes the control performance.
• Connection of PT100 sensor of any type to the actual value input (e.g.
types ST20 - 24).
• The standard signal input can be scaled to the control range actually
required (standard model only).
• Setting of setpoint value via standard 4 - 20 mA or 0 - 10 V signal, keypad
or bus.
• Digital control with a PI control algorithm and settable control parameters.
• Applications in heating and cooling possible.
• Display of setpoint or actual values (to choice) on an LCD display.
• Configuration with three keys.
For measured variables such as pressure, flow rate, conductivity,etc. we offer
suitable controllers, e.g:
• Type 8623-2 for flow rate control with frequency input for the sensor
• Type 8624-2 for pressure, flow rate, conductivity,etc. with standard
signal input for connection of a transmitter.
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8625-2 Standard - 5
3 APPLICATION AREA
The compact temperature controller type 8625-2 is used in the area of mixing
temperature control.
Setpoint
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Actual value (PT100)
Controller type 8625-2
cold
Medium with controlled temperature
Fig.: Structure of a temperature control system with the compact temperature
controller type 86235-2 (schematic)
6 - 8625-2 Standard
hot
Proportional valve
Temperature sensor PT 100
4 TECHNISCHE DATEN
Operating voltage 24 V DC
Power consumption max. 0.3 W (without proportional valve)
Output current (to valve) max. 1.0 A
Operating temperature - 10 °C ... + 60 °C / 14 °F ... 140 °F
Interference resistance to EN50082-2
Interference emission to EN50081-2
Inputs
Sensor input PT100
temperatur range - 50 °C ... 150 °C / - 58 °F ... 302 °F
resolution 0.25 °C or 0.45 °F
precision 1.5 °C bzw 2.7 °F
1)
1)
1 standard signal input 4 - 20 mA / 0 - 10 V, adjustable
resolution 10 Bit
input impedance (4 - 20 mA) < 200 Ω
input impedance (0 - 10 V) > 300 kΩ
Output
PWM output 24 V - pulse width modulated
Controller
Control algorithm PI control
Scan time T
Amplification factor K
Reset time T
Scaling -50 °C ... 150 °C or -58 °F ... 302 °F
A
p
N
50 ms
0,00 - 10,00 %/K
0,1 - 200,1 s
Housing
Cable outlet rotatable in 90° steps
System of protection IP 65
Material polyamide
Dimensions (WxHxD) 54 x 54 x 61 mm
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Order no. 143 571
1)
Calibrated to 1 m conductor length and 0.5 mm² conductor cross-section.
8625-2 Standard - 7
5 COMMISSIONING
NOTE
Interference with the device is only allowed by specialist
personnel using suitable tools!
Before interfering with the temperature controller, always
switch off the voltage!
5.1 Connecting to the proportional valve
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Fig.: Connecting the temperature controller to the proportional valve
Î Unscrew the 4 screws on the front panel of the temperature controller and
remove the cover carefully.
Î Place the housing of the temperature controller with the seal onto the valve.
Î Screw the temperature controller tightly to the valve.
ATTENTION!
Î Place the conver on the temperature controller and screw it tight with the 4
screws
ATTENTION!
8 - 8625-2 Standard
On screwing the temperature controller onto the proportional
valve, make sure the seal is correctly seated!
Make sure the cover is placed on the right way round
(pinned strips must engage in the sockets).
5.2 Changing the cable outlet direction
Î Unscrew the 4 screws on the front panel
of the temperature controller and remove
the cover carefully.
Î Remove the screw to the valve and
remove the plastic cross.
Î Detach the plate from the cube.
Î Pull out the cube downwards and replace
in the desired orientation.
Î Place the plate onto the cube (the pins
must engage in the guides).
Î Lay on the plastic cross and insert the
screw through the cube.
Î Connect the temperature controller to the
proportional valve (see 5.1).
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8625-2 Standard - 9
5.3 Connection configuration of temperature controller
type 8625-2
M12, 4-pole
Supply voltage
and standard
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signal input
External setpoint
M8, 3-pole
PT100 input
Fig.: Connections on temperature controller type 8625-2
M12 (4-pole): Supply voltage and standard signal for setpoint
3 (blue) 2 (white)
1 (brown)*4 (black)
M8 (PT100-input):
4 (black)
1 (brown)
3 (blue)*
Configuration:
1 24 V DC supply voltage
2 Standard signal input, external setpoint
3 GND external setpoint
4 GND supply voltage
* wire colours when using standard cables
with M12 plug (4-pole)
Configuration:
1 PT100 supply (0.5 mA)
3 GND
4 Temperature input PT100
* wire colours when using standard cables
with M8 plug (3-pole)
10 - 8625-2 Standard
connection of temperature sensor PT 100
Temperature
sensor PT 100
1
2
Type 8625-2 temperature controller
M8 (3-pole)
Bridge pin 1 and pin 4 of
temperature controller directly at
the temperature sensor PT100 and
connect to pin 1 of PT100.
Connect pin 3 of temperature
controller to pin 2 of temperature
sensor PT100.
1
(brown)
4 (black)
3 (blue)
Fig.: Connecting temperature sensor PT 100 to type 8625-2
ATTENTION!
Do not connect a voltage to pin 1 of the 3-pole plug! Pin 1
is a 0.5 mA output to supply the sensor (PT100)
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8625-2 Standard - 11
5.4 First commissioning
Settings absolutely necessary on first commissioning
• Type and range of standard signal (4 - 20 mA or 0 - 10 V) with external
setpoint.
• Lower limit for correcting variable (controller output), (see 6.6.8 VALV).
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12 - 8625-2 Standard
6 OPERATING THE TEMPERATURE CONTROLLER TYPE
8625-2
6.1 Operating modes
Three modes are possible for operating the temperature controller type 8625-2:
• Standard mode
• Configuration mode
• Manual mode
english
Standard
Mode
press key briefly
press key for 5 sec.
Configuration
Mode
Menu
.
.
.
END
press key
Fig.: Switching between operating modes
Manual
mode
8625-2 Standard - 13
NOTE
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• After the supply voltage is switched on, the controller is in
the standard mode.
• Change to the other modes is possible by the actions
shown in the figure.
• After the configuration mode is ended, the parameters set
are transferred to the memory of the controller.
• After the operating voltage is switched off, the parameters
last active are stored; on next switching on again, these will
be active again.
6.2 Indications on the display
4-digit display to
indicate the
process values ans
parameters
Bus active
Manual
Indication of specified setpoint value
- internal setpoint (no display)
- external setpoint (1)
- setpoint via bus (1)
Fig.: Display of the compact temperature controller type 8625-2
14 - 8625-2 Standard
mode
4-digit text display, e.g.
of temperature unit in
°C or °F.
6.3 Key allocation
Mode
Standard mode
Manual mode
Configuration
mode
Menu items
Configuration
mode
Edititing menu
items
key
"INC"
"DEC"
press key:
switchover of display
between set and
actual value
press key:
open valve
(inc)
press key:
backwards in menu
press key:
increase the selected
digit*
ENTER-keykey
No function on this model
press key:
switchover of display
between set and actual
value
press key:
close valve
(dec)
press key:
forwards in menu
press key briefly:
to next digit
press key for 2 sec:
set decimal point
behind the place
selected ***
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press key briefly:
enters manual mode
press key for 5 sec:
enters configuration
mode
press key briefly:
back to standard mode
press key:
to edit the menu item
press key:
concludes setting,
back to menu item**
* In the menu item
VALV
, setting is not digit-by-digit but in increasing
sequence within the limits 00 ... 100.
** The values set are transferred to the memory.
*** In the
MODE
mode, a change of sign is possible at the 4th place from the
right.
NOTE The values set are valid for current control procedure only after
the configuration mode has been left in the menu item END with
the key.
8625-2 Standard - 15
6.4 Standard mode
In this mode, the device works after switching on the operating voltage. The
current temperature is now indicated.
6.4.1 Standard mode and internal setpoint
In this mode, the setpoint is specified via the keys of the display.
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Display of actual value (°C)
Setting internal
setpoint
Display of setpoint value (°C)
Fig.: Possible display in standard mode with internal setpoint
16 - 8625-2 Standard
6.4.2 Standard mode and external setpoint
Here the controller receives the setpoint value via the 4 - 20 mA or 0 - 10 V signal
present on pins 2 ans 3 of the 4-pole M12 plug.
Display of actual value ( °C)
1
Setting external setpoint
Display of setpoint value (°C)
Fig.: Possible display in standard mode with external setpoint
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8625-2 Standard - 17
6.5 Manual mode
The manual mode can be activated from the standard mode by briefly pressing
the key.
In the manual mode there is no control: the value of correcting variable last
calculated is a first retained. By pressing the arrow keys, the correcting variable
can be increased or decreased.
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Display in manual mode
Display of actual value
manual mode activated
Î With this key you increase the pulse-duty factor of the proportional
valve, i.e. the latter opens up to a max. of 100 %.
Î With this key you reduce the pulse-duty factor of the proportional
valve.
Î Press the key in the manual mode. On release of the key, you
will return to the standard mode.
Î After switching to the manual mode,
the current actual value is displayed.
Fig.: Displayed after switching to the manual mode
Display of the pulse-duty factor of the valve
Fig.: Display of the pulse-duty factor of the valve
NOTE
18 - 8625-2 Standard
The display
of the PWM signal set in the menu item
corresponds to a pulse-duty factor of 100 %.
0 %
corresponds to the minimum pulse-duty factor
As soon as the correcting variable is
changed by pressing the key or
key, the display switches
automatically to the value of the
correcting variable. After releasing the
key, the curent value is shown again.
VALV
: 100 %
6.6 Configuration mode
STANDARD
CONFIGURATION
MODE
press key for 5 sec
Fig.: Switching over from standard to configuration mode
NOTE
Values that are changed within the configuration mode only
become active when this mode is left in the menu item END by
pressing the key or after switching the device off and on
again.
MODE
MENU
.
.
.
END
press
key
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8625-2 Standard - 19
Key allocation in configuration mode
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Menu level
Edit menu items
UNIT, MODE,
AMPL, INTG,
INV, ZERO
Edit menu item
VALV
Menu item
END
press key:
backwards in menu
press key:
increase the selected
digit or select the
respective menu
subitem
press key:
increase the value,
e.g. 00 ... 100
press key:
forwards in menu
press key briefly:
to next digit
Press key for 2 sec:
set decimal point
behind the position
selected
***
press key:
decrease the value,
e.g. 100 ... 00
press key:
to edit the menu item
press key:
conclude setting,
return to menu item
(menu level)*
press key:
conclude setting,
return to active menu
item (menu level) *
press key:
conclude settings,
return to standard
mode **
* The values set are stored inthe memory,but become active only after
leaving the configuration mode for the current control procedure.
** On leaving the configuration mode, the values currently set become valid
for the controller. The current control is continued with the new parameters!
*** In the
MODE
mode, a change of sign is possible at the 4th place from the
right.
20 - 8625-2 Standard
6.6.1 Menu of configuration mode
STANDARD
MODE
5 s
Settings
Unit of temperature
(see 6.6.2)
Setpoint mode
(see 6.6.3)
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Fig.: Menu of the configuration mode
Amplification K
(see 6.6.4)
Reset time T
(see 6.6.5)
Heating/cooling
(see 6.6.6)
Zero point switch-off
(see 6.6.7)
Adaptation of controller
output (see 6.6.8)
p
N
Storage of the
values set (see
6.6.9)
8625-2 Standard - 21
6.6.2
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UNIT
- setting the unit of the temperature
Î Select here wheter the device is to
display the temperature in °C or °F
(factory setting: °C)
Unit = °C
Unit = °F
Fig.: Setting the unit of the temperature
22 - 8625-2 Standard
6.6.3
MODE
Fig.: Setting the setpoint mode
- setting the setpoint mode
Setting the setpoint: internal setpoint
Î Select here wheter the device shall work with internal or
external setpoint. The choice
the number 1 in the lower display line
(factory setting: external setpoint)
External Setpoint
Internal
setpoint
external
1
setpoint
is shown by
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With internal setpoint setting, the setpoint value for the temperature is entered in
the previously set unit (°C or °F) and stored. The device controls to this value.
Settings are possible between -50 °C and 150 °C or -58 °F and 302 °F.
If it is attempted to set a value outside this range, the display will jump automatically
to 0 and a value must be entered within the range.
The unit corresponds to the value set in the menu item UNIT.
(Factory setting: 0.0).
increase digit
next digit
change sign at 4th place from
2 s
right
Fig.: Setting the setpoint: internal setpoint
8625-2 Standard - 23
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Setting the setpoint: external setpoint
For external setpoint setting you state a scaling. The temperature range
corresponding to the standard signal (4 - 20 mA, 0 - 10 V) must be set, i.e. the
temperature is entered at 4 mA or 0 V (lower limit) and at 20 mA or 10 V (upper
limit).
Settings are possible within -50 °C and 150 °C or -58 °F and 302 °F . If it is
attempted to set a value outside this range, the display will jump automatically to 0
and a value must be entered within the range. The unit corresponds to the value
set in the menu item UNIT (factory setting: EXLO=0.0 °C; EXHI=100.0 °C).
Example:
Lower limit (
Upper limit (
EXLO
) 20 °C 4 mA
EXHI
) 60 °C 20 mA
For example, a standard signal of 12 mA corresponds to a setpoint of 40 °C.
Standard signal 4 - 20 mA
increase digit
next digit
change sign at 4th
2 s
Standard signal 0 - 10 V
place from right
Fig.: Setting the setpoint: external setpoint
If the value for EXHI was selected lower than that for EXLO or equal
to it, the texts MODE and ERR9 appear flashing alternately on the
text display.
In this case the newly set values are not stored!
24 - 8625-2 Standard
2 s
increase digit
next digit
change sign at 4th
place from right
6.6.4
AMPL
Î Select the amplification factor KP in a range from 0.00 to 10.00 %/K (factory
Setting aid:
• If excessive overshoot occurs at the value of KP set or the control
• On the other hand, unsatisfactory control dynamics may be improved by
- setting the amplification Kp
setting: 1.00). If it is attempted to set a higher value, the display will jump
automatically to 0 and a value must be entered within the range.
becomes unstable, you should decrease KP.
raising KP as long as the abovementioned instability does not occur.
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Fig.: Setting the amplification K
increase digit
next digit
2 s set decimal point
P
8625-2 Standard - 25
6.6.5
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INTG
- setting the reset time T
The reset time TN is the time that is needed to obtain the same magnitude of
change in the controller output with the I fraction as occurs with the P fraction.
Î Select the reset time TN in a range from 0.1 to 200.1 sec (works setting:
0.50).
Higher values result automatically in the display 0.1 and a value within the
range must be entered.
2 s set decimal point
N
increase digit
next digit
Fig.: Setting the reset time T
26 - 8625-2 Standard
N
Characteristics of PI controllers
A PI controller has a proportional and an integral fraction (P and I fractions).
P fraction:
Function:
y = Kp · x
d
Kp is the proportionality index (amplification factor). It is the ratio of the controller
output range ∆Y to the proportional range ∆xd.
Characteristic and step response of the P fraction of a PI controller
x
d
y
max
kp*x
y
0
y
min
Proportional range ∆x
Correcting range ∆y
x
d
d
d
Characteristic Step response
Characteristics:
A purely P controller works theoretically undamped, i.e. it is fast and hence
dynamically favourable. It has a residual control difference, i.e. it does not
completely eliminate the effects of disturbances and is thus relatively unfavourable
from a static viewpoint.
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8625-2 Standard - 27
I fraction:
1
Function:
y =
T
i
∫ ∫
∫ xd dt
∫ ∫
Ti is the integration or floating time. It is the time that expires until the controller
output has run through the entire correcting range.
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characteristic and step response of the P fraction of a PI controller
x
x
d
y
max
x
d
y
Control range ∆x
Characteristic
min
c
Floating time T
i
Step response
Correcting range ∆y
Characteristic:
A purely I controller completely eliminates the effects of disturbances. It thus has a
favourable static behaviour. Because of its finite correcting speed, it works more
slowly than a P controller and tends to oscillation. It is hence dynamically relatively
unfavourable.
Superimposing:
With a digital controller with sampling time TA and noting that Ti = Kp/T
write:
y = Kp (xd + TA/TN
∑∑
∑ xd)
∑∑
y : controller output
Kp: amplification factor
xd : deviation (xd = w - x)
TA : sampling time
TN : reset time
28 - 8625-2 Standard
one can
N,
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