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.

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

...............................................................................

..........................................................................................

(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 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

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

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

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

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Standard

Mode

press key briefly

press key for 5 sec.

Configuration

Mode

. .

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)

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

. .

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)

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

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

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

increase digit

next digit

Fig.: Setting the reset time T

26 - 8625-2 Standard

Characteristics of PI controllers

A PI controller has a proportional and an integral fraction (P and I fractions).

P fraction:

Function:

y = Kp · x

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

max

kp*x

min

Proportional range ∆x

Correcting range ∆y

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:

Function:

y =

∫ ∫

∫ 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

max

Control range ∆x

Characteristic

min

Floating time T

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

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