Spirax Sarco LC2400 Manuale utente

IM-P402-84 AB Issue 6 1

LC2400 Controller

Installation and Maintenance Instructions

IM-P402-84

AB Issue 6

4025950/6

1. Safety

2. Application

3. Description

4. Installation

5. Wiring

6. Commissioning

7. Calibration notes

8. Maintenance

9. Fault finding

IM-P402-84 AB Issue 62

Your attention is drawn to Safety Information Leaflet IM-GCM-10.

1. Safety

2. Application

Whenalargesteamdemandismadeofaboiler,

the pressure will drop, and large bubbles of

steam will be formed in the water. This causes

the water level to rise, and can cause the

feedwater valve to close. Although the level of

water has increased, the mass of water will be

decreasing, a situation which actually

requires the feedwater valve to be opening. A

two element control system (probe/level

controller and steam flowmeter), uses the

output from the steam flowmeter to move the

set point of the level controller.

This compensates for the tendency of the

feedwater valve to close when the steam

demand is high. Under certain conditions

where the boiler feedwater pressure varies

considerably, perhaps due to other boilers

drawing water, three element control provides

even closer compensation.

A three element control system uses an

additional input from a water flowmeter to

compensate for any variations in feedwater

pressure.

3. Description

The Spirax Sarco LC2400 is used to connect

alevelcontrollertothe4-20mAoutputsignals

from the steam flowmeter and (where fitted),

the water flowmeter. The controller can be an

LC2200(foranelectricallyactuatedfeedvalve),

or an LC2300 (for a pneumatically actuated

valve). The LC2400 has 'steam' and 'water'

potentiometers which are used to scale the

outputsofthemeters.AgreenLEDnexttoeach

potentiometerindicatesthatasignalispresent.

4. Installation

Warning

Isolatethemainssupplybeforeunplugging

LC2200 or LC2300 controllers since live

terminals at mains voltage will be exposed

in the controller base.

Controllersshould beinstalled inan enclosure

or control panel to provide environmental

protection.

CAUTION: Allow 15mm spacing between

adjacent units for air circulation.

Spirax Sarco can provide suitable enclosures.

The controller may be mounted on a 'top hat'

section DIN rail using the mounting clip

provided, or the clip may be removed and the

controller base screwed direct to a chassis

plate.

IM-P402-84 AB Issue 6 3

5. Wiring

Screened cable is recommended for the LC2400 wiring. The LC2400 is powered by the current

loops(4-20mA)andsoneedsnoseparatepowersupply.Figures1to4,pages4,5,6,and7,show

the wiring connections for various applications.

Clamping screw

Steampotentiometer

Waterpotentiometer

Clamping screw

Green LED's

IM-P402-84 AB Issue 64

Note on 4-20 mA loops:

Steam and water meter inputs (terminals

3 and 10) are earthed via the level probe.

Ensure any equipment connected to the

loop will operate with these terminals

grounded (earthed).

Steam meter

LC2400

Level controller LC2200

Live

Alarm

relay

Neutral

For range link see

commissioning

instructions

Range

link

Test

Control

relay

Neutral

Open

Feedback

input

Feedback

potentiometer

1 000 ohms

Note:

Otheractuators

may have different

connections

Capacitance

probe

IN1

IN2

IN3

Connections to

EL5600 series

actuators

For link position

and sensitivity see

Preamplifier IM

4-20 mA

current

loop 4-20 mA

input

Set point output

12 13

LC2200

Levelcontroller

LC2400

Steam meter

Level

probe

Steam

Motorisedvalve

Fig. 1 Two element level control

with electric valve

Make-up water

IM-P402-84 AB Issue 6 5

Note on 4-20 mA loops:

Steam and water meter inputs (terminals

3 and 10) are earthed via the level probe.

Ensure any equipment connected to the

loop will operate with these terminals

grounded (earthed).

Make-up water

LC2400

Steam meter

Steam

Level

probe

LC2300

Levelcontroller

Fig. 2 Two element level control

with pneumatic valve

Pneumatic

valve with

positioner

Steam meter

LC2400

Level controller LC2300

Live

For range link see

commissioning

instructions

Range

link

Test Neutral

Capacitance

Probe

IN2

For link position

and sensitivity see

Preamplifier IM

4-20 mA

current

loop 4-20 mA

input

4-20 mA

output -

IN1

4-20 mA

current

input

Electropneumatic

positioneronvalve

Live

Neutral

Test

Set point output

IM-P402-84 AB Issue 66

Note on 4-20 mA loops:

Steam and water meter inputs (terminals

3 and 10) are earthed via the level probe.

Ensure any equipment connected to the

loop will operate with these terminals

grounded (earthed).

Steam meter

LC2400

Level controller LC2200

Live

Alarm

relay

Neutral

For range link

seecommissioning

instructions

Range

link

Test

Control

relay

Neutral

Open

Note:

No Feedback

potentiometer

is required

Note:

Otheractuators

may have different

connections

Capacitance

probe

IN1

IN2

IN3

Connections to

EL5600 Series

actuators

For link position

and sensitivity see

Preamplifier IM

4-20 mA

current

loop 4-20 mA

input

Set point output

12 13

LC2200 Level controller

LC2400

Steam meter

Level

probe

Steam

Motorised valve KE/EL

Fig. 3 Three element level control

with electric valve

Make-upwater

Water

meter

4-20 mA

current

loop

Water meter

Feedback input

0-8v 0utput

Live

Neutral

IM-P402-84 AB Issue 6 7

Note on 4-20 mA loops:

Steam and water meter inputs (terminals

3and 10) are earthed via the level probe.

Ensure any equipment connected to the

loop will operate with these terminals

grounded (earthed). LC2400

Water

meter

Steam meter

Level controller LC2000

Live

Neutral

Range

link

Test

Neutral

Capacitance

probe

IN1

IN2

IN1

4-20 mA

current

loop +

LC2300 Level

controller LC2400

Steam meter

Level

probe Steam

Fig. 4 Three element level control

with pneumatic valve

Feedwater

LC2300 flow controller

Pneumatic

valve

For range link

seecommissioning

instructions

Live

Neutral

Test

4-20mA

0-20mA

output -

Live

IN2

4-20mA

0-20mA

input -

4-20 mA

current

input

4-20 mA

current

input

Electropneumatic

positioneronvalve

Water meter

LC2300 used as

a flow controller

Test

Live

Neutral

Controller

LC2300

Set point output

0-20mA

4-20mA

input

IM-P402-84 AB Issue 68

6. Commissioning

The LC2400 has two channels; 'steam' and 'water', each channel consisting of a4-20 mA input

and a scaled output signal. To aid commissioning, each channel has a test input, which allows

measurementofthe4-20mAsignalwithoutbreakingtheloop.Seefigure5.The'steam'channel

also has a range link, which selects one of two ranges to suit the anticipated rise in water levels.

In most cases, the link is fitted. See 'Steam flowmeter input' and figures 6 and 7.

Calibration is carried out by adjusting the 'steam' potentiometer on the LC2400. This raises the

control set point to match the rise in boiler water level at maximum steam demand.

For three element control using the LC2200 controller, the 'water' potentiometer is set to suit the

water flowmeter range.

Preferred commissioning method Level probe input-

- Adjust the 'steam' potentiometer on the LC2400 to the zero position.

- Set the boiler water level (gauge glass) to the desired normal water level (set point).

- Adjustthe LC2200(or LC2300)set pointpotentiometeruntilthe>50%greenLEDjustlights.

- Set the boiler water level to either the top or the bottom of the desired proportional band

(valve fully closed/fully open position), whichever is most convenient.

- Adjust the LC2200 (or LC2300) proportional band potentiometer until

the >100%/<0% amber LED just lights

The IM for the LC2300 gives further details of this procedure.

Steam flowmeter input

- Fit a wire link between terminals 4 and 5 of the LC2400.

- Alter the boiler water to the level anticipated when the steam demand is 100%, i.e.

maximum steam flow.

- Adjust /programthesteamflowmetertooutputa4-20mAsignalrepresenting75%ofmaximum

steam flow (usually 16 mA). See note below.

- Adjust the 'steam' potentiometer on the LC2400 until the green>50% LED on the LC2200/

LC2300 just extinguishes.

- Alter the water level to the set point (at zero steam flow).

- Adjust /programthesteamflowmetertooutputasignalrepresenting0%ofsteamflow (4 mA).

- Adjust the 'set point' potentiometer on the LC2200/LC2300 until the green LED just lights.

Notes: If the green LED does not extinguish then remove the range link from terminals 4 and

5 then readjust the 'steam' potentiometer.

In use, the steam flowmeter output is 4 mA at zero steam flow, and 20 mA at maximum steam

flow. However, when we adjusted the LC2200/ LC2300 set point the steam input was

equivalent to zero output from the steam meter, not 4 mA. The steam flowmeter was set at 75%

output to compensate for this.

IM-P402-84 AB Issue 6 9

Feedwater input (Three element control using LC2200)

- Calculate the output current of the water meter when the water flow is equal to the

rated steam flow:-

Output current (milli-amps) = (rated boiler output x 16) + 4

(flowmeter range)

Note: It is essential that the units for the water flowmeter and the boiler rating are the same.

i.e that both are in kg/h or Ib/h

Example: A boiler has a rated output of 8 000 kg/h. The water flowmeter outputs 20 mA for

a maximum flow of 12 000 kg/h:-

The output current of the meter for this size of boiler is:-

Output current = 8 000 kg/h x 16 + 4 = 14.67 mA

12 000 g/h

- Calculate the water calibration value with the following formula:

Water calibration value (WCV) = 75

Output current (above mA)

i.e. For the example shown above, the output current is 14.67 mA giving a water calibration value of:

WCV = 75

14.67 mA = 5.1

Set the 'water' potentiometer to the water calibration value.

Steam meter

Water meter

4-20 mA

current

loop

4-20 mA

current

loop

LC2400

Test

4-20 mA

Input

Range

link

Set point

output

0-8 V

output

4-20 mA

Input

Fig. 5

Steam channel

Waterchannel

IM-P402-84 AB Issue 610

23456789

110

2345678 9

100

120

140

Rise in water level Rise in water level

Steam calibration settings (SCS)

250

300

150

200

350

400

Fig. 7

Risein waterlevel less than 80 mm.PA20 preamplifier set to high sensitivity (range link fitted)

Riseinwaterlevellessthan140mm.PA20preamplifierset tomediumsensitivity(rangelinkfitted)

Preamplifier (PA20). Medium sensitivity

Preamplifier (PA20). High sensitivity

Fig. 6

Risein waterlevel less than 80 mm.PA20 preamplifier set to high sensitivity (range link fitted)

Riseinwaterlevellessthan140mm.PA20preamplifierset tomediumsensitivity(rangelinkfitted)

500

450 Preamplifier (PA20). Medium sensitivity

Preamplifier (PA20). High sensitivity

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