Grundfos Conex DIS-C Installation And Operating Instructions Manual

Conex

®

DIS-C

Installation and operating instructions

GRUNDFOS INSTRUCTIONS

2

3

Table of contents

Conex

®

DIS-C

English (GB)

Installation and operating instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Deutsch (DE)

Montage- und Betriebsanleitung . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Español (ES)

Instrucciones de instalación y funcionamiento . . . . . . . . . . . . . . . . . . . . . . . . . 54

Français (FR)

Notice d'installation et de fonctionnement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Italiano (IT)

Istruzioni di installazione e funzionamento . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Nederlands (NL)

Installatie- en bedieningsinstructies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Português (PT)

Instruções de instalação e funcionamento . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

English (GB)

4

English (GB) Installation and operating instructions

Original installation and operating instructions

CONTENTS

Page

1. Symbols used in this document

2. General information

These installation and operating instructions contain

all information important for users of the

Conex

®

DIS-C:

• technical data

• instructions on commissioning, use and

maintenance

• safety information.

Should you require further information or should you

encounter problems that are not handled in sufficient

depth in this manual, please contact Grundfos.

We shall be pleased to support you with our

comprehensive know-how in the fields of measuring

and control technology as well as water treatment.

We always welcome suggestions on how to optimise

our installation and operating instructions to satisfy

our customers.

1. Symbols used in this document

4

2. General information

4

3. Description of the device

5

3.1 Assembly

5

3.2 Principles of conductivity measurement

5

4. Applications

6

4.1 Field of application for measurements

6

5. Safety

6

5.1 Obligations of the owner/operations

manager

6

5.2 Avoidance of danger

6

6. Identification

7

6.1 Nameplate

7

6.2 Type key

7

7. Technical data

8

7.1 Versions

8

7.2 General data

8

7.3 Measuring ranges

8

7.4 Dimensional sketches / drilling diagram

9

8. Installation

10

8.1 Transport and storage

10

8.2 Unpacking

10

8.3 Installation requirements

10

8.4 Assembling the Conex® DIS-C housing

for wall mounting

10

8.5 Assembling the Conex® DIS-C-P, CI

housing for installation in control panel

11

9. Commissioning / electrical

connections

11

9.1 Conex® DIS-C conductive, housing for

wall mounting

12

9.2 Conex® DIS-C inductive, housing for

wall mounting

13

9.3 Conex® DIS-C conductive, housing for

installation in control panel

14

9.4 Important instructions for connecting the

device

15

10. Principles of regulatory function

16

10.1 Regulatory behaviour

16

10.2 Limit values

16

10.3 On-off controller with P behaviour

17

10.4 Parameter settings

18

11. Initial operation and settings

19

11.1 Initial steps for operation

19

12. Operation

19

12.1 Device layout for Conex® DIS-C

19

12.2 Menu control

20

12.3 Navigation in the menus

20

12.4 Setup

21

12.5 Relay menu (S1 S2)

25

12.6 Temperature compensation

25

12.7 Displaying / changing code

26

12.8 Controller settings

26

12.9 Alarm value setting A1/A2

27

12.10 Service

28

13. Disposal

28

Warning

Prior to installation, read these installation

and operating instructions. Installation and

operation must comply with local

regulations and accepted codes of good

practice.

Warning

If these safety instructions are not

observed, it may result in personal injury.

Caution

If these safety instructions are not

observed, it may result in malfunction or

damage to the equipment.

Note

Notes or instructions that make the job

easier and ensure safe operation.

English (GB)

5

3. Description of the device

Fig. 1 Conex

®

DIS-C for wall mounting

Fig. 2 Conex

®

DIS-C for installation in control

panel

3.1 Assembly

The complete measuring system comprises:

• the measuring amplifier Conex

®

DIS-C

• the conductivity measuring cell with temperature

sensor.

3.2 Principles of conductivity

measurement

In metallic conductors, electricity is transported by

freely moving electrons, whereas in electrolytes, the

electrical current is carried by ions.

All water-dissolved components that are in ionogenic

form contribute towards conductivity.

The conductivity is a sum parameter.

Different types of ions vary in their electrical charge

and migration rate. The migration rate is highly

dependent on temperature, which means the

influence of temperature must always be taken into

account when measuring conductivity.

Specific electrolytic conductivity is measured in

Siemens per cm (S/cm). Siemens per cm is the

reciprocal value of electrical resistance.

This measurement is based on a theoretical liquid

cube with sides of a length of 1 cm. In practice, cells

rarely have such an even geometric shape. The cell

constant C is used to specify the correlation between

the actual measured conductivity and the displayed

specific conductivity.

The measuring cell is inserted in a flow armature,

and the water to be measured flows around it.

The Conex

®

DIS-C measuring and regulation device

amplifies the signal from the measuring cell and

calculates the signal (e.g. against cable and

temperature compensation parameters). The result

is displayed digitally and can also be registered

using the analog output. The result is shown as an

actual value.

TM03 6980 3914TM03 6981 4506

English (GB)

6

4. Applications

The Conex

®

DIS-C is a measuring amplifier for

measuring conductivity using a conductive or

inductive measuring cell and for regulation of

disturbance variables using a connected control

element. Two controllers can be set separately as

limit values, intermittent pulse controllers or pulse

frequency controllers.

The Conex

®

DIS-C is available for installation in a

wall-mounted enclosure or for installation in a control

panel (only conductive measuring cell for

conductivity measurement).

4.1 Field of application for measurements

Principal uses:

• waste water treatment

• water purification

• recycling

• in metal processing industries

• in the chemical industry

• in the foodstuff industry.

5. Safety

The owner/operations manager of the system is

responsible for the following:

• compliance with country-specific safety

regulations

• training of operating personnel.

5.1 Obligations of the owner/operations

manager

The owner/operations manager must ensure that

persons working with the device described fulfil

these requirements:

• They are acquainted with the regulations

concerning working safety and accident

prevention.

• They have been trained in use of the device.

• They have read and understood the warning

information and handling symbols.

The owner/operations manager is also responsible

for ensuring that this manual is kept in the immediate

vicinity of the device and is always available for the

operating personnel.

5.2 Avoidance of danger

Warning

Installation and connection of the device

and the associated supplementary

components must only be carried out by

authorised personnel!

The local safety regulations must be

observed!

Switch off the power supply before

connecting the power cable and the relay

contacts!

Warning

Do not dismantle the device!

Cleaning, maintenance and repair must

only be carried out by authorised

personnel!

Warning

Other applications than those described in

section 4. Applications are not approved

and not permitted. Grundfos cannot be

held liable for any damage resulting from

incorrect use.

Caution

The mounting location must be selected so

that the housing is not subjected to

mechanical loading.

Check that all settings are correct before

starting up the device!

English (GB)

7

6. Identification

6.1 Nameplate

Fig. 3 Nameplate, Conex

®

DIS-C

6.2 Type key

TM04 0331 3914

DIS-C 1-CC, W-G

351-2000-10006

S/N: 08/02809

Conex DIS-C, 230/240V 50/60Hz

10 VA, IP 65

96725733P1108030802809

1

2

3

4

5

67 8 9

10

11

12

Pos. Description

1 Type designation

2 Model

3 Product name

4 Power consumption [VA]

5 Product number

6 Country of origin

7 Enclosure class

8 Year and week of production

9 Marks of approval, CE mark, etc.

10 Voltage [V]

11 Frequency [Hz]

12 Serial number

Example: DIS -C -P CC -R1 -F -PVC W -G

Units for measurement and control

DIS-C

Dosing Instrumentation Standard for

conductivity measurement

Assembly

PPrepacked

Measuring cell

CC Conductivity, conductive

CI Conductivity, inductive

Measuring range

R1 0 to 200 μS/cm

R2 0 to 2000 μS/cm

R3 0 to 20,000 μS/cm

Armature type

FFlow

I Immersion

X No armature

Armature material

PVC Polyvinyl chloride

PP Polypropylene

Controller mounting option

W Wall-mounted

P Panel-mounted (only for conductive measuring cell)

Power supply

G 1 x 230/240 V, 50/60 Hz

H 1 x 115/120 V, 50/60 Hz

English (GB)

8

7. Technical data

7.1 Versions

7.2 General data

7.3 Measuring ranges

7.3.1 Measuring ranges and cell constants for

Conex

®

DIS-C with conductive measuring

cell

7.3.2 Measuring ranges for Conex

®

DIS-C with

inductive measuring cell

Power supply

• 230 V (± 10 %), 50/60 Hz

(standard version)

• 115/120 V (± 10 %),

50/60 Hz

Type of measuring

cell

• Conductive

• Inductive

Mounting variants

• For wall mounting

• For installation in control

panel (only Conex

®

DIS-C,

CI devices - with

conductive measuring cell).

Dimensions

(W x H x D)

• 165 x 160 x 80 mm

(for wall mounting)

• 96 x 96 x 127 mm (for

installation in control panel)

Weight

• 1.0 kg (for wall mounting)

• 0.8 kg (for installation in

control panel)

Enclosure class

• IP65 (wall-mounted)

• IP54 (front, installation in

control panel)

Internal fuse

• Yes (wall-mounted)

• No (installation in control

panel)

Display

LCD display, two lines,

2 x 16 characters

Connections

Terminal strips for cable up to

maximum 1.5 mm

2

Power consumption 10 VA

Electrical output

0 (4) to 20 mA galvanically

isolated, maximum load 500 Ω

Switching points

Can be set within the

measuring range

Contact rating for

regulation and alarm

relay

6 A / 250 V, maximum ohm

resistive load 550 VA

(with RC contact protection)

Permissible ambient

temperature

0 °C to +50 °C

Permissible storage

temperature

-20 °C to +65 °C

Maximum relative

humidity

90 % (non-condensing)

Adjustable

temperature

coefficient of

measurement

solution

0 to 8 % / °C

Proportional band Xp 1 to 3000 %

Reset time Tn 0 to 3000 seconds

Measuring range Cell constant

Conductive

measuring

cell

0 to 20 MΩ/cm

C = 0.05 96609150

0 to 2 μS/cm

0 to 20 μS/cm

0 to 200 μS/cm

0 to 2 mS/cm C = 0.2 96609151

0 to 20 mS/cm C = 1 96609152

Measuring range

Inductive measuring

cell

0 to 2.000 mS/cm

95720194

0 to 20.00 mS/cm

0 to 200.0 mS/cm

0 to 2000 mS/cm

English (GB)

9

7.4 Dimensional sketches / drilling diagram

Fig. 4 Dimensional sketch / drilling diagram for Conex

®

DIS-C for wall mounting

Fig. 5 Dimensional sketch / mounting sketch for Conex

®

DIS-C for control-panel wall mounting

TM03 6982 4506TM03 6983 4506

10

72.5

1

6

0

165

151

1

2

0

1

5

approx. 129

approx. 137

English (GB)

10

8. Installation

8.1 Transport and storage

• Transport the device carefully, do not drop!

• Store at dry and cool location between -20 °C

and +65 °C.

8.2 Unpacking

• Check the device for damage. Install as soon as

possible after unpacking.

• Do not install or connect damaged devices!

8.3 Installation requirements

• The location must be vibration-free, dry, dust-free

and free of corrosive, pungent fumes or

aggressive solvents.

• Observe the data in section 7. Technical data.

8.4 Assembling the Conex

®

DIS-C housing

for wall mounting

Fig. 6 Installation of Conex

®

DIS-C for wall mounting

1. Drill three dowel holes with a diameter of 8 mm.

See section 7.4 Dimensional sketches / drilling

diagram.

2. Insert the supplied dowel pins.

3. Unscrew the clamp cover from the device.

4. Screw in the top middle screw.

5. Hang the device onto this screw.

6. Secure the device using the other two screws.

7. Screw the clamp cover back on.

Caution

Do not allow any foreign bodies to enter!

Note

Retain the packing material or dispose of it

according to local regulations.

Caution

If you do not observe the installation

requirements, the device may be

damaged! The measurements may not be

correct!

Warning

Switch off the power supply before

installing!

Enclosure class IP65 is only guaranteed if

the clamp covers and the associated

threaded cable connections and temporary

covers are closed.

TM03 6985 4506

151

120

Caution

Do not damage the gasket.

The gasket must be fitted exactly.

English (GB)

11

8.5 Assembling the Conex

®

DIS-C-P, CI

housing for installation in control panel

1. Make an opening of 92 + 0.8 mm x 92 + 0.8 mm

in the control panel.

2. Slip on the supplied gasket.

3. Insert the device into the opening from the front.

4. Hook the clamps into the tightening cones on the

sides at the top and bottom.

5. Secure the device from the rear using a

screwdriver.

9. Commissioning / electrical

connections

1. Remove the terminal cover on the front of the

device.

2. Use the appropriate cable feedthroughs and

tighten the screws carefully.

3. Connect the cables used to the terminals

according to the Conex

®

DIS-C terminal

assignment.

4. Close the terminal cover again with correctly

positioned gasket.

Caution

Do not damage the gasket.

The gasket must be fitted exactly.

Warning

Switch off the power supply before

installing!

Enclosure class IP65 is only guaranteed

with the front panel of the terminals

enclosure closed and with appropriate

cable glands or dummy caps.

Warning

Switch off the power supply before

connecting the power supply cable and the

relay contacts! For safety reasons, the

protective conductor must be connected

correctly!

Observe the local safety regulations!

Protect the cable connections and plugs

against corrosion and humidity.

Caution

Before connecting the power supply cable,

check that the supply voltage specified on

the nameplate corresponds to the local

conditions!

An incorrect supply voltage may destroy

the device!

To ensure electromagnetic compatibility

(EMC), the input and current output cables

must be screened.

Connect the screening to the screen

ground on one side.

Refer to the wiring diagram! Route the

input, current output and power supply

cables in separate cable channels.

Caution

Enclosure class IP65 is only guaranteed if

the terminal cover is correctly sealed! Do

not damage the gasket on the terminal

cover!

The gasket on the terminal cover must be

positioned precisely!

Do not damage the gasket!

Note

Unused terminals must remain open.

English (GB)

12

9.1 Conex

®

DIS-C conductive, housing for wall mounting

Fig. 7 Terminal connection diagram for Conex

®

DIS-C with conductive measuring cell, housing for wall

mounting

Caution

The measurement input must be screened! The screen must not be connected to the Conex

®

DIS-C,

but only to the measuring cell (outer casing of the cell)!

TM03 6986 3914

12

4

5

6

11 12

13

20

21

22

+

L

NPE

14

15 16

17

18 19

A

3

28

27

26

+

29

+

24V

With Pt100, connection with cable:

96611925 (5 m)

96611928 (15 m)

96611929 (25 m)

(maximum cable length: 50 m)

Pos. Description

1 White, inner electrode of measuring cell

2 Brown, outer electrode of measuring cell

4 Yellow, Pt100

5 Green, Pt100

A Trimmer contrast setting

11-12 0/4-20 mA output

14 / 15 Control relay 1 output

16 / 17 Control relay 2 output

18 / 19 Alarm relay 3 output

20 / 21 / 22 For supply voltage, see nameplate

26 / 27 Water sensor

28 Screen

English (GB)

13

9.2 Conex

®

DIS-C inductive, housing for wall mounting

Fig. 8 Terminal connection diagram for Conex

®

DIS-C with inductive measuring cell, housing for wall

mounting

TM03 6987 4011

12

4

5

61112

13

20

21

22

+

L

N

PE

28

27

26

+

14

15 16

17

18 19

A

29

+

24V

3

3b

Connection with 6 m cable,

extendable with extension cable

95720380

Caution!

Cable length without screen:

maximum 30 mm

Caution!

When extending the cable, the screen

must also be extended!

Pos. Description

1 Green, measurement

2 White, screen

3 Red, voltage supply

3b Black, voltage supply screen

4 Yellow, temperature sensor NTC, screen

5 Brown, temperature sensor NTC

A Trimmer contrast setting

11 / 12 0/4 to 20 mA output

14 / 15 Control relay 1 output

16 / 17 Control relay 2 output

18 / 19 Alarm relay 3 output

20 / 21 / 22 For supply voltage, see nameplate

26 / 27 Water sensor (external controller stop)

28 +24 V

29 Screen

English (GB)

14

9.3 Conex

®

DIS-C conductive, housing for installation in control panel

Fig. 9 Terminal connection diagram for Conex

®

DIS-C with conductive measuring cell, housing for

installation in control panel

Caution

The screen must not be connected to the Conex

®

DIS-C, but only to the measuring cell. See the

installation and operating instructions for the measuring cell!

TM03 6988 4409

L1

N

PE

+

-

+

-

1

24

25

26

3

2

4

5

6

7

8

9

10

11

12

13

14

15

18

21

16

19

22

17

20

23

With Pt100, connection with cable:

96611925 (5 m)

96611928 (15 m)

96611929 (25 m)

(maximum length: 50 m)

Pos. Description

2 White, inner electrode of measuring cell

3 Brown, outer electrode of measuring cell

5 Yellow, Pt100

6 Green, Pt100

9 / 10 0/4 to 20 mA output

11 / 12 Water sensor

18 / 19 Control relay 1 output

20 / 21 Control relay 2 output

22 / 23 Alarm relay 3 output

24 / 25 / 26 For supply voltage, see nameplate

English (GB)

15

9.4 Important instructions for connecting

the device

As is common in microprocessor-controlled devices,

certain precautions must be taken during installation

and wiring. In addition to the general guidelines, the

following is of particular importance:

• Input wires and control wires must be laid

separately from one another and from power

supply cables.

• Analog output wires must be screened.

The screen can be connected to the device.

• Relays and protective spools must remain free of

interference.

• If inductive loads are connected, they must either

be screened, or the relay contact must be

protected on the clamping strip of the

Conex

®

DIS-C by an RC protective circuit, in

accordance with the following table and the

switching diagrams.

9.4.1 Power supply

• The device is connected to the power supply at

the clamps (L), (N) and (PE).

• Check the correct supply voltage on the

nameplate.

9.4.2 Connecting the conductivity measuring cell

9.4.3 Relay outputs

If inductive loads (including relay and protective spools)

are connected, they must be screened. If this is not

possible, the relay contact must be protected using a

protection circuit in accordance with the table below.

For AC current

Fig. 10 Protection circuit with AC current

For DC voltage

The relay or protective spool must be screened with

a suppressor diode.

Fig. 11 Protection circuit with DC voltage

9.4.4 Current outputs

Warning

Before connecting the device, switch off

the power supply!

Caution

Connection of an incorrect supply voltage

may destroy the device!

Caution

For connecting the conductivity cell to the

Conex

®

DIS-C, only use the prescribed

cable. This cable must not be used in the

same cable channel as power supply

cables!

Protect cable connections and plugs

against corrosion and moisture!

Current up to Capacitor C Resistor R

60 mA 10 nF, 260 V 390 Ω, 2 W

70 mA 47 nF, 260 V 22 Ω, 2 W

150 mA 100 nF, 260 V 47 Ω, 2 W

1.0 A 220 nF, 260 V 47 Ω, 2 W

TM03 6990 4506TM03 7007 4506

Warning

If floating relay outputs are used, they

must be supplied with a backup fuse!

Caution

When connecting the electrical outputs, be

aware of the polarity and the maximum

load (500 Ω)!

Caution

Use a screened cable for connecting the

electrical outputs. The screen must be

connected to PE with one end.

R = 47 to 390 Ω

C = 10 nF to 220 nF / 260 V

e.g. Siemens MKC B 81 921

Values can be found in the

above table.

+

-

English (GB)

16

10. Principles of regulatory function

Freely selectable control functions mean that the

Conex

®

DIS-C controller can be adapted to a wide

variety of closed-loop control systems.

10.1 Regulatory behaviour

10.1.1 P regulation behaviour

The P controller has a static characteristic curve.

The characteristic proportional band for the P

controller is Xp. Within this range, which is limited to

a maximum or minimum depending on the control

direction, there is a proportional correlation between

the input and output quantities of the controller.

The lower limit is the response threshold of the

controller. This is the smallest regulatory deviation

that leads to a measurable control variable.

The upper limit separates the proportional band from

saturation. Above this limit, no further increase in

output signal is possible, regardless of increases in

the input signal. This range is called the control

range of the controller, and the control variable can

have any value within this range.

Due to the static characteristic curve, the P controller

cannot reach the setpoint in a stationary state.

This results in a consistent regulatory deviation,

which can be reduced by decreasing Xp, but which

cannot be completely eliminated using a P controller.

The controller reacts quicker with small Xp values.

The Xp value cannot, however, be reduced

arbitrarily, as this causes the controller to become

unstable.

10.1.2 I regulation behaviour

The non-delayed relationship between the regulatory

deviation and the control variable in a P controller

results in an undesirable persistent regulatory

deviation. However, if the regulatory deviation is

controlled directly by the regulating speed instead of

the control variable, this fixed assignment of the two

variables no longer applies. The result is an

integrated controller.

With a regulatory deviation of zero, i.e. when the

setpoint is equal to the actual value, the regulating

speed is also zero. Both positive and negative

regulatory deviations can be influenced by positive

or negative regulating speeds. The control variable

covers the whole control range. The control range of

the I controller is the range in which the regulatory

deviation controls the regulating speed in a linear

fashion.

The characteristic value of the I controller is the reset

time Tn. The reset time is the time that must elapse,

due to the integrated mode of action, for the step

response to reach the value that a P controller would

reach immediately.

The control circuit reacts slowly. If a regulatory

deviation results, an I controller can only react by

constantly changing its control variable. For this

reason, regulation with I controllers is always slower

than with controllers that act proportionally. If the

speed of the controller is increased by decreasing

the integration constant, the control circuit has a

slight tendency towards instability.

At Tn = 0, the controller has no I proportion.

In the absence of external influences, a control

circuit with an I controller therefore has no residual

regulatory deviation in a stationary state when the

control variable is constant.

10.2 Limit values

In principle, the limit value only has two switching

states; ON and OFF. Depending on the set control

direction, the controller is deactivated when the

setpoint value is exceeded, or when the value drops

below the setpoint.

10.2.1 Limit values with hysteresis

To prevent constant switching when the setpoint

value is reached, it is possible to specify a hysteresis

for the controller.

Example:

• setpoint 600 μS/cm

• hysteresis 10 μS/cm.

The hysteresis band is arranged symmetrically

around the switching point.

• Switch-off point = measured value + hysteresis / 2

• Switch-on point = measured value - hysteresis / 2.

Fig. 12 Limit values with hysteresis

Note

Setting for a limit value: Xp = O.

TM03 6991 4506

t

605

600

595

µS/cm

1

0

Relay

605 μS/cm

600 μS/cm

595 μS/cm

μS/cm

English (GB)

17

10.3 On-off controller with P behaviour

It is possible to use an on-off controller with P

behaviour as an intermittent pulse regulator or as a

pulse frequency regulator.

10.3.1 Intermittent pulse regulator

Example:

• setpoint = 6 mS/cm

• measuring range 0 to 10

• Xp = 30

• control direction = downwards.

Xp determines the size of the proportional band as a

percentage of the measuring range. In the following

example, this means that above 6 mS the relay

switches on, first with a short activation time and

then with an increasing activation time to 9 mS (the

total switching on + off time remains constant).

For greater measured values, the relay remains

constantly switched on.

Fig. 13 Intermittent pulse regulator

The intermittent pulse regulation offers the option to

recreate a constant controlling element using very

simple control elements, e.g. a magnetic valve.

Here, the relationship between switching on and off

is changed depending on the calculated control

variable. The total time (ON+OFF) is constant in

intermittent pulse regulation. The total time can be

set to between 1 and 99 seconds depending on the

control system. A setting of 10 seconds leads to a

good result in most cases.

If the calculated control variable is very low, in some

cases it is possible that the control element attached

here does not show a reaction within this short time.

In this case, it is possible to set a minimum drive

pulse. This can be within the range 0.1 to

9.9 seconds.

10.3.2 Pulse-frequency regulator

Example:

• setpoint = 6 mS/cm

• measuring range 0 to 10

• Xp = 20 or 40

• pulse frequency = 120

• control direction = downwards.

Xp determines the size of the proportional band as a

percentage of the measuring range. In the following

example, this means that impulses are output from

6 mS and constantly increase to 8 mS (Xp = 20) or

10 mS (Xp = 40). For higher measured values, the

prespecified maximum number of impulses (here

120/min) is output.

Fig. 14 Pulse-frequency regulator

The pulse frequency regulator in combination with an

appropriate control variable is almost the same as a

continuous controller. The disadvantages of the

impulse-driven control variable only becomes

apparent in the lower control variable range and with

a low maximum pulse frequency. The specification of

the maximum pulse frequency refers to 100 %

dosing flow and can be set within a range from 0 to

180 impulses per minute.

Note

Setting for an on-off controller: Xp > O.

Note

Setting for an intermittent pulse regulator:

Xp > O, pulse frequency = 0.

TM03 6992 4506

SP setpoint

MV measured value

6

7

8

9

T

ON

T

ON

T

[]mS/cm

2 3

0 1

4 5

6 7

8

10

9

[mS ]/cm

SP

MV

[mS/cm]

Note

The intermittent pulse period must always

be at least twice as long as the minimum

switch-on time!

Note

Setting for a pulse-frequency regulator:

Xp > O, pulse frequency > 0.

TM03 6993 4506

0

30

60

90

100%

6

789

10

120

Xp = 40

Xp = 20

[1 min]/

Pulse frequency

Measured

value

Setpoint

[1/min]

[mS/cm]

English (GB)

18

10.3.3 Continuous action controllers

The control variables calculated by the controller

based on the setpoint S1 or S2 can optionally be

output as a continuous control signal via the analog

output.

See section 12.4.4 Analog output.

Fig. 15 Continuous-action controllers

10.4 Parameter settings

Make a note here of the parameter settings for the

device.

TM03 6994 4506

0

5

10

15

100%

6

789

10

20

Xp = 40

Xp = 20

[mA]

Current output

Measured

value

Setpoint

[m/A]

[mS/cm]

Setup

Controller

Pulse freq. S1 _____ / min

Pulse freq. S2 _____ / min

Ctrl. direction S1

__ downward

__ upward

Ctrl. direction S2

__ downward

__ upward

Hysteresis _____ μS

Int. pulse period _____ s

Min. switch-on _____ s

Delay control

Delay ctrl.

__ off

__ on

Delay ctrl. _____ s

Analog output

Select output

__ 0-20 mA

__ 4-20 mA

Start 0/4 mA _____ μS

End 20 mA _____ μS

Analog output __ measured value

Temper. coeff. _____ % / °C

Cell const. _____

Measur. range _____

Averaging

__ on

__ off

Temperature compensation

Temp. compens.

__ Automat.comp.

__ Manual comp.

Manual temp. _____ °C

Controller settings

Setpoint 1 _____ μS

Prop. band XP S1 _____ μS

Reset time TN S1 _____ s

Setpoint 2 _____ μS

Prop. band XP S2 _____ μS

Reset time TN S2 _____ s

Alarm

Alarm value A1 _____ μS

Alarm value A2 _____ μS

Delay _____ s

English (GB)

19

11. Initial operation and settings

11.1 Initial steps for operation

Once the assembly and connection steps have been

completed, carry out the following steps when using

the device for the first time.

1. Switch on the power supply.

2. If required, set the measuring range.

3. Check the entered cell constants.

4. If necessary, perform a cable compensation (for a

conductive measuring cell).

5. Set the parameters for the device function.

Check the outputs and secondary devices.

12. Operation

12.1 Device layout for Conex

®

DIS-C

12.1.1 Control and display elements

The Conex

®

DIS-C conductivity measuring amplifier

is operated using a touch-sensitive membrane

keypad.

Fig. 16 Control and display elements

Display

Control elements

Display fields

Fig. 17 Display fields

Warning

Before connecting the power supply,

ensure that the supply voltage

corresponds to the power supply specified

on the nameplate!

Note

Notes or instructions that make the job

easier and ensure safe operation.

TM03 6995 4506

Pos. Description

1LCD display

1

2

6

345

Pos. Function Name

2

Menu control button

[Up]

3[Left]

4[Down]

5 [Right]

6

Button for returning to

start menu

[OK]

TM03 6996 4506

Pos. Description

1a

Measuring value display

• Displays the current measured value

in MΩ, μS, mS (depending on the

selected measuring range).

1b

Temperature display

• Displays the temperature used for

compensation. Depending on the

setting, this is either the manually

specified temperature or the

temperature measured using the

temperature sensor.

1c

Relay 1 switching status

• A filled rectangle indicates

switched-on status.

1d

Relay 2 switching status

• A filled rectangle indicates

switched-on status.

1e

Control function

• Displays the preselected regulation

type.

1f Display of active menu control buttons.

English (GB)

20

12.2 Menu control

12.3 Navigation in the menus

• To navigate in and between menus, use the [Up]

and [Down] buttons.

• Use the [Right] button to open the menu next to

it. The currently active menu control buttons are

displayed in the corresponding line.

• Use the [Left] button to save values.

• Use [OK] to exit the menu and return to the start

display.

Main menu Default values

Temp. compens.

Temp. compens. Manual comp.

Manual temp. 025 °C

Enter password Enter password Code 086

Controller

Setpoint S1 02.5 μS

Prop. and xp S1 10 %

Reset time TN S1 000 s

Setpoint S2 02.0 μS

Prop. band xp S2 10 %

Reset time TN S2 000 s

Alarm values

Alarm value A1 00.0 μS

Alarm value A2 02.0 μS

Delay 0.05 s

Setup See table below

Service See table below

Setup menu Default values

Corr. temp. Corr. temp. 0 °C

Contr. param.

Pulse freq. S1 0-180 / min

Pulse freq. S2 0-180 / min

Ctrl. direction S1 Downward control

Ctrl. direction S2 Upward control

Hysteresis 00.1 μS

Int. pulse period 10 s

Min. switch-on 0.5 s

Delay ctrl.

Delay ctrl. off

Delay ctrl. 180 s

Analog output

Select output 0-20 mA

Start 0/4 mA 00.0 μS

End 20 mA 200.0 μS

Analog output Measured value

Language Sel. language Deutsch

Temper. coeff. Temper. coeff. 0.0 % / °C

Cell const. Cell const. 0.050

Cable

compens.

Cable compens. 00.0 μS

Measur. range Measur. range 20.00 μS

Averaging Averaging off

Service menu Default values

Product info

Unit No. No. 041

Software date M/Y 1.00

Product. date M/Y 1.00

Analog input

Input 1 -019

Input 2 000 °C

Delete setting Delete setting

Note

Important menu selections and changes to

data are code-protected to prevent

unauthorised access.

Note

The order of the settings in the following

section is different to the order of menu

navigation. This section describes the

basic settings that are made first during

setup.

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Grundfos Conex DIS-C Installation And Operating Instructions Manual

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