Spirax Sarco LCR2251 Bedienungsanleitung

IM-P693-02 EMM Issue 2 1

LCR2251 Level Controller

LCR2251

Level Controller

Installation and Maintenance Instructions

IM-P693-02

EMM Issue 2

850144-01

1. Safety information

2. General product information

3. Mechanical installation

4. Electrical installation

5. Commissioning

6. Fault finding

7. Technical information

8. Technical assistance

Printed in Germany

IM-P693-02 EMM Issue 2

LCR2251 Level Controller

The equipment may only be installed, electrically connected and commissioned by suitable persons

with the relevant instruction/training.

Maintenance and modification may only be performed by authorised staff who have undergone

specific instruction/training.

Danger

The terminal strips of the equipment are live during operation! There is a risk of

serious injury due to electric shock!

Always cut off the power supply to the equipment before installing, removing or

connecting terminal strips!

Important

The name plate specifies the features of the equipment. Do not commission or operate

any item of equipment that does not have its own specific name plate.

Directives and standards

VdTÜV Bulletin "Wasserstand 100" (Water Level 100)

The LCR2251 level controller, in combination with the LP20/LP21/PA420 level transmitter, is type

approved to the VdTÜV Bulletin "Water Level 100".

The VdTÜV "Wasserstand (=Water Level) 100" describes the requirements for water level control

and limiting equipment for boilers.

LV (Low Voltage Directive) and EMC (Electromagnetic Compatibility)

The equipment conforms to the requirements of the Low Voltage Directive 2014/35/EU and the

EMC Directive 2014/30/EU.

ATEX (Atmosphère Explosible)

The equipment must not be used in potentially explosive atmospheres, in accordance with European

Directive 2014/34/EU.

1. Safety information

IM-P693-02 EMM Issue 2 3

LCR2251 Level Controller

2.1 Intended use

The LCR2251 level controller is used in combination with the LP20/LP21/PA420 level transmitter as a limit

switch and water level controller, e.g. in steam and water boiler systems, or in condensate and feedwater

tanks. The level controller indicates when a MIN and MAX water level has been reached, and controls a

control valve or pump.

2.2 Function

The LCR2251 level controller processes the level-dependent current signal from the LP20/LP21/ PA420 level

transmitter. This input signal is recognised by the controller as 0 and 100 % of the boiler measuring range,

and shown as an actual value on the 7-segment LED display.

The level controller works with an electro-pneumatically actuated control valve as a continuous controller

with proportional-plus-integral control(PI controller). In the event of deviations from the setpoint, it outputs

a current of 4-20 mA as manipulated variable Y.

Alternatively the controller can be configured to control a pump (on/off control) and transmit a 4 - 20 mA

signal to provide an external level indication (actual value output).

The controller can be configured for fill or discharge control.

If the MIN or MAX water level is reached, after the de-energizing delay the MIN or MAX output contact

switches over in the level controller, and the MIN or MAX LED lights up.

Faults in the level transmitter, the electrical connection or the settings are indicated as error codes on the

7-segment LED display. In the event of a malfunction, the MIN and MAX alarm is triggered.

If faults occur only in the LCR2251 level controller, the MIN and MAX alarm is triggered and the system is

restarted.

Parameters can be changed or the MIN/MAX alarm simulated by operating the push buttons.

2. General product information

Fig. 1

IM-P693-02 EMM Issue 2

LCR2251 Level Controller

3. Mechanical installation

3.1 Dimensions (approximate) in mm

12046

Item

1Upper terminal strip

2Lower terminal strip

3Housing

4Support rail TH 35, EN 60715

Fig. 2

3.2 Installation in control cabinet

The LCR2251 level controller is clipped onto a type TH 35, EN 60715 support rail in the control cabinet.

Fig. 2, item 4

IM-P693-02 EMM Issue 2 5

LCR2251 Level Controller

M 0,5A

LP20/

LP21/

PA420

IN 4-20mA

4 W

OUT 4-20mA

actual value/

control output

+12V

24 V

±20%

LOOP-

LOOP+

3.3 Name plates

Fig. 3

Type

designation

Top

Bottom

Safety information

Manufacturer

Degree of protection

External fuse for output contacts

Ambient temperature

Output

contacts

Actual value output/control

signal for valve

Fuse, provided on site

Power consumption

Supply voltage

Connection

of level

transmitter

Approvals

Disposal

information

Serial number

IM-P693-02 EMM Issue 2

LCR2251 Level Controller

4. Electrical installation

4.1 Wiring diagram

0.5 A (semi- delay)

1 3

4 5

Item

1MIN output contact, de-energizing delay 3 seconds.

2Pump output contact. Not used in continuous controller.

3MAX output contact, de-energizing delay 3 seconds.

4Supply voltage connection 24 Vdc with semi-delay fuse 0.5 A provided on site.

5Output 4-20 mA, manipulated variable Y for continuous controller or actual value output for ON/

OFF controller (pump control).

6Level transmitter LP20/LP21/PA420, 4-20 mA.

7Earthing point at auxilliary equipment (e.g.PA420/LP20/LP21).

8Central earthing point (CEP) in control cabinet.

Fig. 4

IM-P693-02 EMM Issue 2 7

LCR2251 Level Controller

4.2 Supply voltage connection

The equipment must be supplied with 24 Vdc from a SELV (Safety Extra Low Voltage ) power supply. An

external 0.5A semi-delay fuse must also be fitted.

This power supply unit must be electrically isolated from dangerous live voltages and meet the requirements

for double or reinforced insulation in accordance with one of the following standards:

EN 50178, EN 61010-1, EN 60730-1, EN 60950-1 or EN 62368-1.

4.3 Connection of output contacts

Wire the upper terminal strip 1(terminals 16-23), shown in Figure 1, according to the desired switching

functions. Provide an external slow-blow 2.5 A fuse for the output contacts.

When inductive loads are switched off, voltage spikes are produced that may have a major adverse effect on

the operation of control and measuring systems. Connected inductive loads must therefore have interference

suppression (RC combination) as per the manufacturer's specifications.

4.4 Connecting the level transmitter

For connecting the equipment, please use a screened, multi-core control cable with a minimum conductor

size of 0.5 mm2, e.g. LiYCY 2 x 0.5 mm2, maximum length 100 m.

Wire the terminal strip as shown in the wiring diagram (see Fig. 4).

Connect the screen as shown in the wiring diagram.

Route the connecting cable between items of equipment separately from power lines.

4.5 Output of manipulated variable Y or connection of actual

value output

For connection, please use a screened, multi-core control cable with a minimum conductor size of 0.5 mm2,

e.g. LiYCY 2 x 0.5 mm2, maximum length 100 m. Please note the load of max. 500 ohms.

Wire the terminal strip as shown in the wiring diagram (see Fig. 4).

Connect the screen as shown in the wiring diagram (Fig. 4). Route the connecting cable between items of

equipment separately from power lines.

Any item of equipment that you wish to connect to the terminals for the output of manipulated

variable Y or actual value output 4-20 mA must be certified to have at least double or reinforced insulation

to EN 50178, EN 61010-1, EN 60730-1, EN 60950-1 or EN 62368-1. between the current loop and live parts

of the equipment that are not supplied with safety extra-low voltage (SELV).

Important

Do not use unused terminals as support point terminals.

4.6 Tools

Screwdriver size 3.5 x 100 mm, fully insulated to VDE 0680-1.

IM-P693-02 EMM Issue 2

LCR2251 Level Controller

4.7 Connection of level transmitter

The LCR2251 level controller can be combined with the LP2, LP21 and PA420 level transmitter.

For connecting the equipment, please use a screened, multi-core control cable with a minimum conductor

size of 0.5 mm2, e.g. LiYCY 2 x 0.5 mm2, maximum length 100 m.

Connect the screen as shown in the wiring diagram

Important

-Please commission the equipment as described in the LP20/LP21/PA420

installation and operating manuals.

-Route the connecting cable between items of equipment separately from power

lines.

IM-P693-02 EMM Issue 2 9

LCR2251 Level Controller

5. Commissioning

5.1 Factory settings

-De-energizing delay: 3 sec. (factory set)

-Current input for the connection of LP20/LP21/PA420 level transmitter.

-MAX switchpoint AL.Hi = 80 %

-MIN switchpoint AL.Lo = 20 %

-Setpoint SP = 50 % (continuous controller) or SP.Hi = 60% and SP.Lo = 40% (ON/OFF controller)

-Proportional band Pb = 20 % of setpoint (continuous controller only)

-Integral action time ti = 0 s (continuous controller only)

-Dead band = +/– 5 % of setpoint (factory set)

-Filter = 2 s

-Fill control function

Code switch C: S1 = OFF, S2 = OFF, S3 = ON, S4 = ON See Figure 5

5.2 Changing factory settings

Danger

The upper terminal strip of the equipment is live during operation.

There is a risk of serious injury due to electric shock!

Always cut off the power supply to the equipment before installing, removing or

connecting the terminal strip!

IM-P693-02 EMM Issue 2

LCR2251 Level Controller

5.3 Changing the function and input of the level transmitter

The input and function are determined by the setting of code switch C. To make changes, you can access

the code switch as follows:

-Switch off the supply voltage.

-Remove the lower terminal strip (Fig. 5).

-Insert a screwdriver between the terminal strip and the front frame, to the right and left of the arrow

markings.

-Release the terminal strip on the right and left sides, by turning the screwdriver in the direction of the arrow.

-Remove the terminal strip.

Fig. 5

When your changes are complete:

-Refit the lower terminal strip.

-Switch the supply voltage back on. The equipment restarts

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