Siemens LMV52 series Manuale utente

Based on the following

software versions:

LMV50... : V10.20

LMV51... : V05.10

LMV51.3… : V05.10

LMV52.2.. : V05.10

LMV52.4... : V10.20

Int. LR module: V02.10

Int. VSD module: V01.50

ZL52...: V05.00

PLL52...: V01.50

CC1A7550.5en

07.07.2015

Building Technologies Division

LMV52…

Burner management system for forced draft

burners

LMV52.4…:

- COx supervision and control

User Manual

The LMV5 and this User Manual are intended for OEMs which integrate the LMV5

in their products!

Note!

This documentation is only valid together with the LMV5... Basic

Documentation P7550.

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Contents 07.07.2015

Contents

1Supplementary documentation....................................................................3

2Warning notes................................................................................................4

3Typographical conventions..........................................................................4

4COx supervision and control........................................................................5

4.1General ............................................................................................................5

4.2Compatibility of the COx functions...................................................................5

4.3Functioning principle of COx supervision.........................................................5

4.4Hardware prerequisite / Connection diagram ..................................................6

4.5Operating modes of COx supervision ..............................................................6

4.5.1COx Alarm operating mode .............................................................................7

4.5.2COx Control operating mode ...........................................................................8

4.6Increasing the manipulated variable in case of COx signal (O2ModOffset,

formerly O2Offset) ...........................................................................................9

4.7Setting notes ..................................................................................................10

4.7.1Parameterizations ..........................................................................................10

4.7.2Setting fuel-air ratio control ............................................................................10

4.7.3Setting the O2 trim controller .........................................................................11

4.7.4Setting the COx supervision ..........................................................................11

4.8Display on the AZL52.....................................................................................12

4.9Displaying the O2 trim controller status .........................................................12

5List of error messages of LMV5 system....................................................13

6Revision history...........................................................................................17

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Building Technologies Division User Manual LMV5... CC1A7550.5en

Supplementary documentation 07.07.2015

1 Supplementary documentation

Product type Type of documentation Documentation number

AZL5... User Documentation AZL5... Modbus A7550

LMV5... User Documentation

Basic diagram of LMV5... for 2 types of gas

A7550.1

LMV5... User Documentation

Basic diagram of LMV5... for 2 types of liquid fuel

A7550.3

LMV5... User Documentation

Assembly of VKF41...C gas damper with ASK33.4 mounting kit

to the SQM45.295A9 actuator

A7550.4

LMV5... Setting Lists (parameter and error list) I7550

ACS450 Operating Instructions J7550

LMV5… Installation Guide J7550.1

LMV5... Data Sheet N7550

LMV5... Basic Documentation P7550

LMV5... Product Range Overview

This document contains a complete overview

Q7550

AZL52 / LMV51 User Manual U7550

AZL52 / LMV51 User Manual U7550.1

AZL52 / LMV52 User Manual U7550.2

AZL52 / LMV52 User Manual U7550.3

AZL52 / LMV50 User Manual U7550.4

AZL52 / LMV50 User Manual U7550.5

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Warning notes 07.07.2015

2 Warning notes

Warning!

The safety, warning, and technical notes given in the Basic Documentation on

the LMV5 (P7550) apply fully to the present document also!

To avoid injury to persons, damage to property or the environment, the following

warning notes must be observed!

The LMV5 is a safety device! Do not open, interfere with or modify the unit.

Siemens will not assume responsibility for any damage resulting from

unauthorized interference!

3 Typographical conventions

Safety notes

This User Manual contains information which must be observed to ensure your

personal safety and to prevent damage to equipment and property. The instructions

and notes are highlighted by warning triangles and arrows and are presented as

follows, depending on the hazard level:

Warning means that death, severe personal injury or substantial

damage to property can occur if adequate

precautionary measures are not taken.

Note draws your attention to other information about the

product and its handling contained in other pieces of

documentation.

Only qualified personnel are allowed to commission and operate the unit. Qualified

personnel in the context of the safety-related notes contained in this document are

persons who are authorized to commission, ground and tag devices, systems and

electrical circuits in compliance with established safety practices and standards.

Note the following:

The unit may only be used on applications described in the technical documentation

and only in connection with third-party products and components approved or

recommended by Siemens.

The products can only function correctly and safely if shipped, stored, set up and

installed correctly, and operated and maintained as specified.

Qualified personnel

Correct use

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COx supervision and control 07.07.2015

4 COx supervision and control

4.1 General



Note!

The COx sensor is not included in the Siemens AG scope of delivery.

OEM customer is responsible for checking that the sensor is suitable for the

functions described below.

4.2 Compatibility of the COx functions

The new COx functions are available from the following software versions:

- PLL52 from software version V01.40

(as this requires a supply air sensor temperature range of >400 °C).

- LMV52.4 from software version V10.10

4.3 Functioning principle of COx supervision

For the purpose of supervising the COx quantities during combustion, the LMV52.4

offers the option of connecting a COx measurement transducer to the PLL52.

The states of the COx measurement transducer switching output have the following

meanings:

Contact open: COx present

Contact closed: No COx present

These are evaluated by the LMV52.4 when COx supervision is active.

When COx supervision is active, line breaks, faults in the PLL52, and faults in the bus

communication between the LMV52.4 and PLL52 result in a safety shutdown. This is

also the case during O2 trim control.

Warning!

The connections of the COx sensor to the LMV52.4, and the COx functions in

the LMV52.4, are not established in a fail-safe manner.

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COx supervision and control 07.07.2015

4.4 Hardware prerequisite / Connection diagram

The following hardware is required for COx supervision with LMV52.4:

COx sensor with a potential-free switching contact (NO contact).

The COx limit value at which the contact switches is defined in the COx

measurement transducer.

The COx sensor must be suitable for the fuels being used.

The PLL52, input X87 must be available for the COx sensor connection:

- For this, the supply air temperature sensor for calculating the firing efficiency can,

alternatively, be connected to input X60 of the load controller and activated by

means of the PLL52 parameter AirTempX60PT1000.

Parameter AirTempX60PT1000 (deactivated, activated)

- The Startmode parameter for O2 trim control must be set to standard or

IgnPtWoutTC, as all other start modes require a temperature sensor at input

X87 of the PLL52. In terms of the CO functions, we recommend using the

standard start mode only.

Parameter Startmode (standard, Ign Load TC, IgnPtWithTC, IgnPtWoutTC)

If input X87 on the PLL52 is used to connect the COx sensor, the PLL52 parameter

SupAirTempSens must be set to Pt1000.

COx control is only possible as of PLL52 software version V01.40, as this requires

a temperature range for the supply air temperature sensor of >400 °C.

R1 R2

COxmax

X87

Pin 2

X87

Pin 1

PLL52...

7550d46/0712

- Resistor R1: 7.15 kΩ(±10%)

- Resistor R2: 3.6 kΩ(±10%)

- Relay in no-load status: COx threshold exceeded

- Relay switched: COx threshold not achieved

4.5 Operating modes of COx supervision

With the OptgMode COx parameter, one of the two COx operating modes COx Alarm

or COx Control can be set, and the COx functions deactivated.

Parameter Gas: OptgMode COx (deactivated / COx Alarm / COx Control)

Oil: OptgMode COx (deactivated / COx Alarm / COx Control)

Suggested wiring

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COx supervision and control 07.07.2015

4.5.1 COx Alarm operating mode

For straightforward supervision of the COx value, the parameter OptgMode COx must

be set to COx Alarm.

Phases of COx alarm:

Once prepurging is complete (upon entering phase 36), a single check is

performed to determine whether a COx signal is present.

If a COx signal is present, the fault response takes place immediately.

In the operating phases (60, 62), checks are performed continuously to determine

whether a COx signal is present after a waiting time has elapsed

(NumberTauSuspend * Tau Low-Fire).

If the COx signal is then present for longer than the parameterizable time COx

Alarm, the fault response takes place.

Fault response:

A safety shutdown is performed with a new startup and, depending on the O2 trim

controller repetition counter, lockout takes place.

Parameters:

The waiting time referred to above for the COx Alarm is dependent on the Tau

Low-Fire time constant determined by O2 trim control, and can be set using the

NumberTauSuspend parameter as a multiple of Tau Low-Fire:

Parameter NumberTauSuspend (0..140) * Tau Low-Fire)

Permissible time for a COx signal to reach in the operating phases (60 and 62)

before the fault response takes place:

Parameter Time COx Alarm (0..600s)



Note!

If prepurging is skipped, the COx value is not checked in this section of the

startup process.



Note!

The NumberTauSuspend parameter is also used as the locking time for O2 trim

control.



Note!

The sampling time of the COx signal is approximately 3 seconds.

This must be taken into account when setting the test time Time COx Alarm e.g.,

for a required maximum response time of 10 seconds, the parameter must be set

to 7 seconds.

Warning!

As the connections of the COx sensor to the LMV52.4, and the COx

functions in the LMV52.4, are not established in a fail-safe manner, use the

COx supervisory function always in conjunction with the O2 alarm function.

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COx supervision and control 07.07.2015

4.5.2 COx Control operating mode

This operating mode is only implemented for modulating operation.

The function is not available in multi-stage oil operation.

In addition, the O2 trim control function must be activated (O2 trim controller operating

modes: O2 Control or conAutoDeac).

This operating mode is activated by setting the OptgMode COx parameter to COx

Control.

Parameter Gas: OptgMode COx (deactivated / COx Alarm / COx Control)

Oil: OptgMode COx (deactivated / COx Alarm / COx Control)

In addition to COx supervision, the O2 value (an air supply) is then increased by means

of the O2 trim control function if a COx signal is present during operation.

This is not a conventional COx control (with a COx setpoint, actual value, and control

difference), but instead is an O2 trim control effect in relation to the COx value.

COx supervision takes place in the same way as in the COx Alarm operating mode.

Phases of COx control:

The COx controller is active in the operating phases (60, 62).

COx control is released at the same time as O2 trim control.

Value of the O2 increase:

The O2ModOffset parameter for the relevant fuel is used to specify how much the O2

value increases.

This is the same parameter as the one already used to increase the O2 value in the

case of fast load changes (see chapter Increasing the manipulated variable in case of

fast load changes in the LMV5 Basic Documentation (P7550)).

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COx supervision and control 07.07.2015

4.6 Increasing the manipulated variable in case of

COx signal (O2ModOffset, formerly O2Offset)

If the COx maximum value is exceeded, the contact is closed (see chapter Hardware

prerequisite / Connection diagram).

In order to prevent this, the user can use parameters to set an offset for the O2 value in

the event that a COx signal occurs.

The next increase can only be made once the locking time has elapsed (waiting time of

2 x Tau current load).

There will be no increase of the O2 value when O2 trim control is deactivated.

The parameter defines the increase of the O2 value in %.

Example:

O2ModOffset = 0.8%, O2 actual value 1.4% In the event of COx signal, the O2 value

reached will be 2.2%.

Actual O2 value

O2ModOffset

1.4%

2.2%

O2 setpoint

7550d49e/1114

Figure 1: Increasing the manipulated variable in the case of a COx signal

Parameter Gas: O2ModOffset (0..5%)

Oil: O2ModOffset (0..5%)

Fault response:

The test time Time COx Alarm is started at the same time as the O2 value is increased.

Once the test time is complete, and if the COx signal is still present in spite of

increasing the air supply, a fault response takes place in the form of a safety shutdown

with new startup and, depending on the O2 Control repetition counter, lockout is

performed.

Parameter Time COx Alarm (0..600 s)

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COx supervision and control 07.07.2015

4.7 Setting notes

(Summary of the most important rules for setting COx control)

4.7.1 Parameterizations

Parameterize all truly air-regulating actuators as such

If the parameter settings are changed, O2trim control must be readjusted

First of all, the O2 trim control must be set with deactivated COx sensor (see

chapter Operating modes of COx supervision)

Parameter OptgMode COx Gas (deactivated, COx Alarm, COx Control)

4.7.2 Setting fuel-air ratio control

Caution!

Set sufficient excess O2

Set the amount of excess air of the ratio control curve such that, whatever the

environmental conditions (combustion chamber and fuel pressure, temperature

and pressure of the combustion air), the set residual O2 content will lie above the

O2 setpoints required by O2 trim control.

Example:

Figure 2: Setting fuel-air ratio control

Parameterized load proportional to the fuel rate

The burner load parameterized at the curvepoints must be proportional to the

actual burner load. To make the correct setting, determine the burner load with

the help of the fuel meter.

Curvepoint 1

The first curvepoint should have an adequate distance below curvepoint .

This means that the curve for reducing the air rate is also defined below point

. As a guide value, point should lie at about half the load of point .

Point should be smaller than or equal to the low-fire load.

Note!

The following values can be entered at the AZL52... from software version V05.00 for

the LMV52.2... and software version V10.10 for the LMV52.4...:

(O2 ratio control - O2 setpoint) 0.1%

(O2 setpoint - O2 min value) 0.1%

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