Siemens LMV37.4 Series Operator's manual
Software version
V03.70
CC1P7546en
17.12.2018 Building Technologies
LMV37.4...
Basic unit with integrated fuel-air ratio control for
forced draft burners
Basic Documentation
The LMV37.4 and this Basic Documentation are intended for OEMs which integrate the units in their
products!
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Supplementary documentation
User Documentation Modbus AZL2........................................................................ A7541
Environmental Product Declaration LMV2 / LMV3.................................................. E7541
Installation and Operating Instructions PC Software ACS410 .................................J7352
Data ‘Sheet LMV37.4..............................................................................................N7546
Product Range Overview LMV2 / LMV3 .................................................................Q7541
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Contents
1Safety notes .................................................................................................10
1.1Warning notes ...............................................................................................10
1.2Mounting notes.............................................................................................. 11
1.3Installation notes............................................................................................12
1.4Electrical connection of the LMV37.4 ............................................................ 13
1.5Connection BC interface via integrated RJ11 jack (X56) ..............................14
1.6Electrical connection of flame detectors ........................................................15
1.7Commissioning notes ....................................................................................15
1.8Notes on settings and parameter settings..................................................... 17
1.9Standards and certificates ............................................................................. 18
1.10Service notes................................................................................................. 19
1.11Life cycle........................................................................................................ 19
1.12Disposal notes ............................................................................................... 19
2Makeup of structure / function description...............................................20
2.1For Europe..................................................................................................... 20
2.2For North America .........................................................................................20
2.3General information....................................................................................... 21
3Type summary .............................................................................................21
4Technical Data .............................................................................................22
4.1Basic unit LMV37.4........................................................................................22
4.1.1Terminal loading «Inputs» .............................................................................23
4.1.2Terminal loading «Outputs» ..........................................................................23
4.1.3Analog output / load output X74 pin 3 ...........................................................25
4.1.4Cable lengths................................................................................................. 25
4.1.5Cross-sectional areas.................................................................................... 25
4.1.6Connections of actuators............................................................................... 25
4.2Signal cable AGV50 from AZL2 BC interface ........................................... 26
4.3Environmental conditions ..............................................................................26
4.4Flame detector............................................................................................... 27
4.4.1Ionization probe............................................................................................. 27
4.4.2UV flame detectors QRA2 / QRA4 / QRA10.................................................. 29
4.4.3Photoresistive flame detectors QRB1 / QRB3...............................................30
4.4.4Yellow flame detector QRB4 .........................................................................31
4.4.5Blue-flame detectors QRC............................................................................. 32
5Dimensions ..................................................................................................33
5.1LMV37.4 ........................................................................................................33
6Display and diagnostics .............................................................................34
7Basic unit LMV37.4...................................................................................... 34
7.1Description of inputs and outputs .................................................................. 34
7.2Flame detectors............................................................................................. 35
7.2.1Loss of flame .................................................................................................35
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7.2.2Extraneous light .............................................................................................36
7.2.3No flame at the end of safety time .................................................................36
7.2.4Flame intensity...............................................................................................36
7.2.5Supervision of flame detector ........................................................................36
7.2.6Flame detection sensitivity.............................................................................37
7.3Digital inputs ..................................................................................................38
7.3.1Safety loop X3–04 pin 1 and 2.......................................................................38
7.3.2Burner flange X3–03, pin 1 and 2 ..................................................................39
7.3.3Input for external load controller (ON / OFF) X5–03, pin 1 ............................39
7.3.4Inputs X5-03 pin 2 and 3 (Open / Close or stage 2 / stage 3)........................39
7.3.5Air pressure switch X3-02 ..............................................................................40
7.3.6Gas pressure switch valve proving – or heavy oil direct start X9-04 .............41
7.3.7Gas / oil pressure switch-min, start release gas X5–01.................................43
7.3.8Setting the time for making the pressure switch test .....................................45
7.3.9Gas / oil pressure switch-max / or POC contact, start release oil / additional
speed-dependent air pressure switch X5-02 .................................................46
7.3.10Reset X8-04, pin 1 .........................................................................................49
7.4Digital outputs ................................................................................................50
7.4.1Output alarm type No-SI – X3–05, pin 2........................................................50
7.4.2Fan motor contactor type SI – X3–05, pin 1 ..................................................50
7.4.3Fan continuous purging X3–05, pin 3 ............................................................50
7.4.4Output ignition type SI (IGNITION) X4-02......................................................51
7.4.5Outputs fuel valves type SI V1 / V2 / V3 / PV) X8-02, X7-01, X7-02 .............52
7.4.6Output safety valve type SI X6–03.................................................................52
7.4.7Output for indication of operation X8-04, pin 2 ..............................................52
7.5Program sequence.........................................................................................53
7.5.1Time parameters............................................................................................53
7.5.2Valve proving .................................................................................................54
7.5.3Valve proving with separate pressure switch X9-04 ......................................55
7.5.3.1.Valve proving via gas pressure switch-min X5-01 .........................................56
7.5.3.2.Lockout phase (phase 00) .............................................................................56
7.5.3.3.Safety phase (phase 01)................................................................................57
7.5.4Special functions during the program sequence............................................58
7.5.4.1.Reset / manual lockout ..................................................................................58
7.5.4.2.Alarm upon start prevention...........................................................................59
7.5.4.3.Possible start preventions..............................................................................60
7.5.4.4.Repetition counter..........................................................................................60
7.5.4.5.Start without prepurging (as per EN 676) ......................................................63
7.5.4.6.Gas shortage program...................................................................................64
7.5.4.7.Program stop function....................................................................................65
7.5.4.8.Forced intermittent operation (<24 hours) .....................................................65
7.5.4.9.Low-fire shutdown..........................................................................................65
7.5.4.10.Continuous fan...............................................................................................66
7.5.4.11.Test function for approval of burner – loss-of-flame test (TÜV test) ..............67
7.5.4.12.Postpurging in the lockout position ................................................................68
7.5.4.13.Switching back to pilot ...................................................................................69
7.6Fuel trains (application examples) .................................................................71
7.7Sequence diagrams.......................................................................................80
7.7.1Gas direct ignition «G», «G mod», «G mod pneu»........................................81
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7.7.2Gas pilot ignition 1 «Gp1», «Gp1 mod», «Gp1 mod pneu»...........................82
7.7.3Gas pilot ignition 2 «Gp2», «Gp2 mod», «Gp2 mod pneu»...........................83
7.7.4Light oil direct ignition «Lo», «Lo mod», «Lo 2-stage», «Lo 3-stage» ........... 84
7.7.5Light oil pilot ignition «LoGp» «LoGp mod» «LoGp 2 stage» ........................ 85
7.7.6Heavy oil direct ignition «Ho», «Ho mod separate circulation control», «Ho 2-
stage separate circulation control»................................................................ 86
7.7.7Heavy oil direct ignition «Ho», «Ho mod without circulation control», «Ho 2-
stage without circulation control», «Ho 3-stage without circulation control» .87
7.7.8Legend to the sequence diagrams ................................................................88
8Selection of operating mode ......................................................................91
8.1Deleting curves.............................................................................................. 93
9Connection to load controllers .................................................................. 94
9.1Load controller ON contact X5-03 pin 1 ........................................................94
9.2External load controller via contacts X5-03, pin 2 / pin 3...............................94
9.3Default output via building automation – X92 ................................................ 97
9.4Manual output................................................................................................ 99
9.5Output with curve settings .............................................................................99
9.6External load controller via analog input X64 pin 1 / X64 pin 2 ................... 100
9.6.1Switching thresholds for modulating operation............................................100
9.6.2Switching thresholds for multistage operation.............................................101
9.7Prioritization of load controller sources........................................................102
9.7.1Emergency operation with several load controller sources ......................... 103
9.7.2Manual control............................................................................................. 103
10Electronic ratio control .............................................................................104
10.1General........................................................................................................ 104
10.2Behavior outside the operating positions.....................................................104
10.2.1Traveling speed........................................................................................... 104
10.2.2Home position..............................................................................................104
10.2.3Prepurging ................................................................................................... 105
10.2.4Ignition ......................................................................................................... 105
10.2.5Postpurging .................................................................................................105
10.3Modulating operation................................................................................... 106
10.3.1Definition of curves ...................................................................................... 106
10.3.2Traveling speed / maximum curve slope ..................................................... 107
10.3.3Entering the running position....................................................................... 108
10.3.4Operating position .......................................................................................108
10.3.5Limitation of modulation range ....................................................................109
10.3.6Setting the minimum and maximum output .................................................110
10.4Multistage operation ....................................................................................111
10.4.1Definition of curves ...................................................................................... 111
10.4.2Traveling speed........................................................................................... 111
10.4.3Adjustment of output.................................................................................... 112
10.4.4Entering the operating position.................................................................... 112
10.4.5Operating position .......................................................................................112
10.4.6Limitation of modulation range ....................................................................113
10.5End of operating position............................................................................. 113
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10.6Notes on settings and parameter settings ...................................................114
11Actuators X53 / X54 ...................................................................................115
11.1Function principle.........................................................................................115
11.2Definition of angles ......................................................................................115
11.3Referencing..................................................................................................116
11.3.1Reference travel...........................................................................................118
11.4Direction of rotation......................................................................................120
11.5Monitoring the actuator positions.................................................................121
11.6Changing the error detection band for monitoring the actuator positions ....123
11.7Forced travel................................................................................................123
11.8Detection of line interruptions ......................................................................123
11.9Protection against actuator mixup................................................................124
11.9.1Proposal for implementation ........................................................................124
12Fan control .................................................................................................125
12.1Function principle.........................................................................................125
12.2Activation of VSD/PWM fan .........................................................................125
12.3VSD control X74 pin 3..................................................................................126
12.4PWM fan control X64 pin 3 ..........................................................................126
12.5Safe separation of mains voltage and protective extra low-voltage.............127
12.6Ramp time....................................................................................................127
12.7Acquisition of speed.....................................................................................128
12.7.1Acquisition of speed with proximity switch ...................................................128
12.7.2Acquisition of speed with Hall generator......................................................129
12.7.3Forced travel fan..........................................................................................130
12.8Speed control...............................................................................................130
12.9Speed supervision .......................................................................................131
12.9.1Extended speed supervision........................................................................132
12.10Setting the parameters of VSD ....................................................................133
12.11Standardization of speed .............................................................................134
12.12Control of fan motor with pneumatic fuel-air ratio control ............................138
12.13EMC of LMV37.4 and VSD ..........................................................................138
12.14Special conditions for PWM fan in electronic fuel-air ratio control system...138
12.14.1Characteristics PWM fan .............................................................................139
12.14.2Acquisition of speed PWM fan .....................................................................140
12.15Trim function ................................................................................................141
12.15.1Settings and mode of operation ...................................................................142
12.15.2Optional internal checks...............................................................................143
12.15.3External tests (optional) ...............................................................................145
12.16Description of connection terminals .............................................................147
12.16.1VSD..............................................................................................................147
12.16.2PWM fan ......................................................................................................147
13Load output X74 pin 3 ...............................................................................148
13.1Safe separation of mains voltage and extra low-voltage ............................148
13.2Modulating operation ...................................................................................149
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13.32-stage operation......................................................................................... 149
13.43-stage operation......................................................................................... 149
14Fuel meter input X75 pin 1 / X75 pin 2..................................................... 150
14.1Configuration of fuel meter ..........................................................................150
14.1.1Types of fuel meters.................................................................................... 150
14.1.2Configuration of pulses per volume unit ...................................................... 150
14.1.3Reading and resetting the meter readings ..................................................150
14.2Fuel throughput ...........................................................................................151
14.2.1Configuration ...............................................................................................151
14.2.2Reading out the fuel throughput ..................................................................151
15Connection and internal diagram ............................................................152
16Special feature: Burner identification......................................................153
17Connection to superposed systems........................................................153
17.1General information and building automation functions ..............................153
17.2Modbus........................................................................................................ 155
18PC software ACS410 .................................................................................156
19Error history...............................................................................................157
19.1Error classes................................................................................................ 157
19.2Makeup of error history................................................................................ 158
20Lifecycle function......................................................................................158
21Safety notes on use of the AZL2..............................................................159
22Operating via AZL2....................................................................................160
22.1Description of unit/display and buttons........................................................160
22.2Meaning of symbols on the display .............................................................161
22.3Brightness of display ...................................................................................161
22.4Special functions .........................................................................................161
22.4.1Manual lockout ............................................................................................161
22.4.2Manual control (manual request for output)................................................. 162
22.5Timeout for menu operation ........................................................................162
22.6Backup / restore ..........................................................................................163
22.6.1Backup.........................................................................................................164
22.6.2Restore........................................................................................................ 166
23Operation of LMV37.4 via the AZL2 .........................................................168
23.1Normal display............................................................................................. 168
23.1.1Display in standby mode .............................................................................168
23.1.2Display during startup / shutdown ...............................................................168
23.1.2.1.Display of program phases.......................................................................... 168
23.1.2.2.Display of program phase with remaining running time until end of the phase
is reached.................................................................................................... 168
23.1.2.3.List of phase displays .................................................................................. 169
23.1.3Display of operating position .......................................................................170
23.1.4Fault status messages, display of errors and info .......................................171
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23.1.4.1.Display of errors (faults) with lockout ...........................................................171
23.1.4.2.Reset............................................................................................................171
23.1.4.3.Activating info / service mode from lockout..................................................171
23.1.4.4.Error with safety shutdown...........................................................................172
23.1.4.5.General information .....................................................................................172
23.1.4.6.Prevention of startup....................................................................................172
23.1.4.7.Safety loop...................................................................................................172
24Menu-driven operation ..............................................................................173
24.1Assignment of levels ....................................................................................173
25Info level .....................................................................................................174
25.1Display of info level ......................................................................................174
25.2Display of info values (examples) ................................................................175
25.2.1Identification date.........................................................................................175
25.2.2Identification number....................................................................................175
25.2.3Burner identification .....................................................................................176
25.2.4Number of startups resettable......................................................................177
25.2.5Total number of startups..............................................................................178
25.2.6End of info level ...........................................................................................178
26Service level ...............................................................................................179
26.1Display of service level ................................................................................179
26.2Display of service values (example) ............................................................180
26.2.1Number of faults...........................................................................................180
26.2.2Error history .................................................................................................180
26.2.3Intensity of flame..........................................................................................180
26.2.4End of service level......................................................................................181
27Parameter level ..........................................................................................182
27.1Entry of password ........................................................................................183
27.2Entry of burner identification ........................................................................185
27.3Change of heating engineer’s password......................................................187
27.4Change of OEM’s password ........................................................................188
27.5Use of parameter level.................................................................................188
27.6Structure of parameter levels.......................................................................189
27.7Parameters without index, with direct display ..............................................190
27.7.1Using the example of parameter 208: Program stop ...................................190
27.8Parameters without index, with no direct display (with parameters having a
value range >5 digits) ..................................................................................192
27.8.1Using the example of parameter 162: Operating hours resettable ..............192
27.9Parameter with index, with direct display.....................................................194
27.9.1Using the example of parameter 501: No-flame positions fuel actuator ......194
27.10Parameters with index, with no direct display ..............................................196
27.10.1Using the example of parameter 701: Errors ...............................................196
27.11Fuel-air ratio curves – settings and commissioning.....................................199
27.11.1Initial commissioning....................................................................................199
27.11.2Setting curvepoints P0 and P9 for modulating operation («G mod», «Gp1
mod», «Gp2 mod» and «Lo mod»)..............................................................202
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27.11.3Setting curvepoints P0 and P9 for «G mod pneu», «Gp1 mod pneu» and
«Gp2 mod pneu»......................................................................................... 203
27.11.4Warm settings for modulating operation («G mod», «Gp1 mod», «Gp2 mod»
and «Lo mod») ............................................................................................204
27.11.5Warm settings for modulating mode («G mod pneu», «Gp1 mod pneu» and
«Gp2 mod pneu»)........................................................................................ 209
27.11.6Cold settings for «G mod», «Gp1 mod», «Gp2 mod» and «Lo mod» ......... 209
27.11.7Cold settings for «G mod pneu», «Gp1 mod pneu» and «Gp2 mod pneu» 210
27.11.8Editing the curvepoints ................................................................................ 211
27.11.9Interpolating the curvepoints .......................................................................212
27.11.10Setting of curvepoints for multistage mode («Lo 2-stage» and «Lo 3-stage»)215
27.11.11Warm settings for «Lo 2-stage» and «Lo 3-stage» .....................................216
27.11.12Cold settings for multistage mode («Lo 2-stage» and «Lo 3-stage»).......... 220
27.11.13Intensity of flame during curve settings ....................................................... 221
28Parameter list LMV37.4 ............................................................................. 222
29Error code list (all LMV2 types / LMV3 types) ...........................................238
30Revision history of LMV37.4.....................................................................255
31List of figures.............................................................................................260
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1 Safety notes
1.1 Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes must be observed!
LMV37.4 are safety devices! Do not open, interfere with or modify the units.
Siemens does not assume responsibility for damage resulting from unauthorized
interference!
Additional safety notes contained in other chapters of this document must be
observed as well!
After commissioning and after each service visit, check the flue gas values
across the entire output range!
The present Basic Documentation describes a wide choice of applications and functions
and shall serve as a guideline. The correct functioning of the units is to be checked and
proven by function checks on a test rig or on the plant itself!
All activities (mounting, installation and service work, etc.) must be performed by
qualified personnel
Degree of protection IP40 as per DIN EN 60529 for the LMV37.4 must be ensured
through adequate mounting of the LMV37.4 by the burner or boiler manufacturer
Before making any wiring changes in the connection area, completely isolate the
plant from mains supply (all-polar disconnection). Ensure that the plant cannot be
inadvertently switched on again and that it is indeed dead. If not disconnected, there
is a risk of electric shock hazard
Protection against electric shock hazard on the LMV37.4 and on all connected
electrical components must be ensured through adequate mounting. In terms of
design, stability and protection, the cover used must conform to EN 60730
After each activity (mounting, installation and service work, etc.), check to ensure
that wiring is in an orderly state and that the parameters are correctly set
Fall or shock can adversely affect the safety functions. Such units must not be put
into operation even if they do not exhibit any damage
When programming the fuel-air ratio control curves, the commissioning engineer
must constantly watch the quality of the combustion process (e.g. by means of a
flue gas analyzer) and, in the event of poor combustion values or dangerous
conditions, take appropriate actions, e.g. by shutting down the LMV37.4 manually
The following plug-on terminations carry FELV (Functional Extra Low-Voltage) (also
refer to chapter Electrical connection of the LMV37.4) which means that they do not
provide safe separation from mains voltage:
- The BCI (X56) for the connecting cable of the AZL2 or PC software ACS410
- COM (X92) for accessories, such as the OCI410
These plug-on terminations may be removed or replaced only when the plant is dead
(all-polar disconnection)
The connectors of the connecting cables for the LMV37.4 or other accessories,
such as the OCI410 (plugged into the BCI), may only be removed or exchanged
when the plant is shut down (all-polar disconnection), since the BCI interface does
not provide safe separation from mains voltage
The connections for the SQM3 or SQN1 actuators do not provide safe separation
from mains voltage. Prior to connecting or changing one of these actuators, the
plant must be shut down (all-polar disconnection)
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To ensure safety and reliability of the LMV37.4, the following points must also be
observed:
Condensation and ingress of humidity must be avoided. Should such conditions
occur, make sure that the unit is completed dry before switching on again!
Static charges must be avoided since they can damage the unit’s electronic
components when touched.
Recommendation: Use ESD equipment
If the unit fuse was blown due to overload or a short-circuit at the connection
terminals, the LMV37.4 must be replaced since the switching contacts might have
been damaged
If error codes 95…98 appear during operation, this may be an indication of contact
problems and the LMV37.4 should be replaced
1.2 Mounting notes
Ensure that the relevant national safety regulations and standard notes are
complied with
In geographical areas where DIN regulations are in use, the requirements of VDE
must be satisfied, especially DIN / VDE 0100, 0550 and DIN / VDE 0722
The LMV37.4 must be secured with fixing screws M4 (UNC32) or M5 (UNC24),
observing a maximum tightening torque of 1.8 Nm and using all 4 fixing points. The
additional mounting surfaces on the housing are provided to improve mechanical
stability. These must fully rest on the mounting surface to which the unit is secured.
The flatness of that mounting surface must be within a tolerance band of 0.3 mm
122
(103.5)
6.5
103.5 10
217
M5 x 4
0,3
Bild 365./0409
Additional mounting
surfaces
Outer contour of housing
Figure 1: Note on mounting
Note on mounting
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1.3 Installation notes
Always run the high-voltage ignition cables separate from the unit and other cables
while observing the greatest possible distances
Ensure that the electrical wiring inside the boiler is in compliance with national and
local safety regulations
Mains power must always be supplied via Land N. This means that no potential
differential must exist between the neutral conductor Nand protective conductor PE
Phase and neutral conductor must not be interchanged (dangerous malfunctions,
loss of protection against electric shock hazard, etc.)
Make certain that strain relief of the connected cables is in compliance with the
relevant standards (e.g. as per DIN EN 60730 and DIN EN 60335)
Ensure that spliced wires cannot get into contact with neighboring terminals. Use
adequate ferrules
The burner manufacturer must protect unused terminals of the LMV37.4 by fitting
dummy plugs (exception: X64 (reserve) and X74)
When making the wiring, the AC 120 V or AC 230 V section must be strictly
separated from other voltage sections, thus ensuring protection against electric
shock hazard. For more detailed information, refer to chapter Electrical connection
of the LMV37.4
The connectors of the connecting cables for the LMV37.4 may only be removed or
exchanged when the plant is turned off (all-polar disconnection), since the BCI
interface does not provide safe separation from mains voltage
AGV50 signal cable between LMV37.4 and AZL2
Since the BCI carries FELV (refer to chapter Electrical connection of the LMV37.4),
the connection between LMV37.4 and AZL2 must be established via the AGV50
signal cable, or by ensuring compliance with the specification. The signal cable is
specified for use under the burner hood. When using other types of signal cable that
do not meet the specification requirements, safety against electric shock hazard is
not necessarily ensured
Do not lay signal cable AGV50 from the LMV37.4 to the AZL2 together with other
cables
Service operation with a longer signal cable from the LMV37.4:
If a longer signal cable is required for service work for example (short-time usage,
<24 hours), note that the above application under the burner hood no longer applies
and, for this reason, the signal cable can be subjected to increased mechanical
stress. In that case, use a reinforced signal cable
Both the AGV50 signal cable and the AZL2 must be shipped and stored so that no
damage due to dust and water can occur when the products are used in the plant
To ensure protection against electric shock hazard, make certain that, prior to
switching on power, the AGV50 signal cable is correctly connected to the AZL2
The AZL2 must be used in a dry and clean environment
The mechanical coupling between the actuators and the controlling elements for
fuel and air, or any other controlling elements, must be rigid
Once the LMV37.4 has been installed in the equipment, a check must be carried out
to ensure compliance with the EMC emission requirements!
When grounded PELV signals are connected to the SELV terminals of the burner
control, they also become PELV voltages (according to EN 60730-1, chapter 11.2.7,
EN 298 chapter 9.2.d)
An isolating transformer grounded on one side must be used if the wiring takes
place with a mains circuit without a grounded conductor or the mains supply
between the phases (in accordance with EN 298-1, chapter 9.2.d)
To prevent high-energy couplings due to magnetic induction or capacitive coupling,
the cable lengths must be >10 m on the detector cables and communication lines
with a shielded cable, grounded on both sides (based on requirements from EN
13611)
Testing torque of the screws RAST5 connector: 0.5 Nm
Testing torque of the screws RAST3.5 connector: 0.25 Nm
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1.4 Electrical connection of the LMV37.4
The LMV37.4 operates with the following low-voltages:
SELV (Safety Extra Low-Voltage) and PELV (Protective Extra Low-Voltage) ensure
protection against electric shock hazard
FELV (Functional Extra Low-Voltage) without safe separation offers no protection
which, in the event of fault, would not exclude risks
Mains voltage
SELV
PELV FELV
Mains voltage
Figure 2: Electrical connection
Note
SELV or PELV depends on the safety class of the connected components. In the case
of PELV, the relevant component is connected to protective earth.
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1.5 Connection BC interface via integrated RJ11
jack (X56)
If the BC interface (jack RJ11) is not used, protection against electric shock hazard
must be provided (jack must be covered up)
The AZL2 signal cable or other accessories like the OCI410 interface (plugged into
the RJ11 jack), may only be plugged in or disconnected when the unit is dead (all-
polar disconnection), since the BC interface does not provide safe separation from
mains voltage
The AZL2 is designed for direct connection to the integrated RJ11 jack on the
LMV37.4
Signal cable from LMV37.4 to AZL2 must conform to certain specifications.
Siemens has specified the signal cable for use under the burner hood. When using
other signal cables, it is not guaranteed that the required cable features will be met.
Do not lay the signal cable from the LMV37.4 to the AZL2 together with other
cables. Use a separate cable
Service operation with a longer signal cable from LMV37.4 to AZL2
If a longer signal cable is required for service work, for example (short-time, <24
hours), note that the above usage under the burner hood no longer applies and, for
this reason, the signal cable can be subjected to increased mechanical stress. Extra
cable sheathing is therefore required
Both the signal cable and the AZL2 must be shipped and stored so that no damage
due to dust and water can occur when used in the plant later on
To ensure protection against electric shock hazard, make certain that, prior to
switching on power, the signal cable is correctly connected to the AZL2
The AZL2 must be used in a dry and clean environment
Connection interface OCI410 on the BC interface
Connect the OCI410 interface without other extension with the USB interface at your
PC, follow the example design below.
ACS410
PC software
LMV...
OCI410
Bild 418e/0812
RJ11
USB2.0
Figure 3: Connection interface OCI410 on the BC interface
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1.6 Electrical connection of flame detectors
It is important to achieve practically disturbance-free and loss-free signal transmission:
Never run the detector cables together with other cables
– Line capacitance reduces the magnitude of the flame signal
– Use a separate cable
Observe the permissible detector cable lengths
The mains-powered ionization probe is not protected against electric shock hazard.
It must be protected against accidental contact
Earth the burner in compliance with the relevant regulations; earthing the boiler
alone does not suffice
Locate the ignition electrode and the ionization probe such that the ignition spark
cannot arc over to the ionization probe (risk of electrical overloads)
Insulation resistance
- The insulation resistance must be >50 Mbetween ionization probe and ground
- Soiled detector holders reduce the insulation resistance, thus supporting creepage
currents
1.7 Commissioning notes
When commissioning the unit, check all safety functions
There is no absolute protection against incorrect use of the RASTx connectors. For
this reason, prior to commissioning the plant, check the correct assignment of all
connectors
Electromagnetic emissions must be checked on an application-specific basis
After the plant has been installed and commissioned, the person responsible for the
plant / heating engineer must document the parameterized values and settings (e.g.
curve characteristics)used for fuel-air ratio control.
These data can be printed out with the help of the ACS410 PC software, for example, or
must be written down.
This document must be kept in a safe place and checked by the expert.
Caution!
On the OEM level of the LMV37.4, parameter settings other than those specified
in the application standards can be made. For this reason, check whether the
parameter settings made are in compliance with the relevant application
standards (e.g. EN 676, EN 267, etc.), or whether the respective plant demands
special approval!
The selected setting values of fuel and combustion air must be assigned such that –
while giving consideration to the combustion chamber / fuel pressure, temperature and
combustion air pressure, as well as wear of actuators and controlling elements, etc. –
correct operation with sufficient amounts of excess air is ensured across the burner’s full
output range for an extensive period of time (until the next regular inspection is due; also
refer to chapter Monitoring the positions). This must be proven by the burner / boiler
manufacturer by measuring the characteristic combustion process values. If the
standardization process is repeated, the fuel-air ratio control system must be rechecked.
Prior to commissioning the system, the following points must be checked:
Parameterization of operating mode (e.g. «G mod», «Gp1 mod», «Lo mod», etc.)
must accord with the type of burner used (refer to chapter Selection of operating
mode)
Correct assignment of the valves to the valve outputs of the LMV37.4
Correct setting of the time parameters, especially the safety and prepurge times
Correct functioning of the flame detector in the event of loss of flame during
operation (including the response time), with extraneous light, during the prepurge
time and, when there is no establishment of flame, at the end of the safety time
Activation of the valve proving function and determination of the correct leakage
rate, if required by the application (refer to chapter Valve proving)
A
ir-fuel ratio
control system
LMV37.4
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The functions of the following available or required input status signals must be
checked:
Air pressure
Minimum gas pressure / maximum gas pressure or POC
Gas pressure valve proving
Minimum oil pressure and maximum oil pressure
Safety loop (e.g. safety limiter)
Duties of the expert when making the approval tests
Action Check / response
a) Burner startup with flame detector
darkened
Lockout at the end of first safety time
b) Burner startup with flame detector exposed to
extraneous light, e.g. to incandescent light with
detectors for visible radiation, quartz-halogen bulb
or cigarette lighter flame with detectors for UV
radiation
Lockout at prepurge time
c) Simulation of loss of flame during operation. For
that, darken the flame detector in the operating
position and maintain that state
Lockout or restart, depending on the LMV37.4
configuration
d) Check the plant’s response time with loss of flame
during operation. For that purpose, manually
disconnect the fuel valves from power and check
the time from this moment the LMV37.4 requires to
turn off power to the valve
Turning off power to the valves by the LMV37.4 within
the period of time permitted for the respective type of
plant
e) Check the safe operation of the burner while giving
consideration to LMV37.4 tolerances
LMV37.4 tolerances are the result of a number of
factors, such as:
Tolerances of actuators plus mechanical linkage to
the controlling elements
Environmental conditions
(temperature, air conditions)
Type of fuel (calorific value / pressure)
Type of supply air path and flue ways
Example of procedure for checking the burner’s
response to actuator tolerances:
Approach a output point in programming mode (e.g.
low-fire or high-fire)
Change the actuator’s position against the optimum
fuel-air ratio setting as can be expected in the case
of tolerances
Check the flue gas values with a flue gas analyzer
Recommendation:
Make this readjustment against the optimum fuel-air
ratio setting for one actuator at a time!
Further checks may be required, depending on the field of use and the relevant
standards.
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1.8 Notes on settings and parameter settings
When adjusting the electronic fuel-air ratio control system integrated in the
LMV37.4, allow for sufficient amounts of excess air since – over a period of time –
the flue gas settings are affected by a number of factors (e.g. density of air, wear of
actuators and controlling elements, etc.). For this reason, the flue gas values initially
set must be checked at regular intervals
To safeguard against inadvertent or unauthorized parameter transfer from the PC
software ACS410 to the LMV37.4, the OEM must assign an individual burner
identification for each burner. Compliance with this regulation is mandatory to
ensure that the LMV37.4 prevents the transfer of parameter sets of some other
plant (with inadequate and possibly dangerous parameter values) to the LMV37.4
via the PC software ACS410. In addition, the fuel-air ratio control parameters must
be manually approached and the combustion values checked
With the LMV37.4, it is to be noted that the unit’s characteristics are determined
primarily by the specific parameter settings rather than the type of LMV37.4. This
means that, among other things, each time a plant is commissioned, the parameter
settings must be checked and the LMV37.4 must not be transferred from one plant
to another without adapting the parameter settings to the new plant
When using the ACS410 PC software, the safety notes given in the relevant
Installation and Operating Instructions (J7352) must also be observed
A password protects the parameter level against unauthorized access. The OEM
allocates individual passwords to the setting levels he can access. The default
passwords used by Siemens must be changed by the OEM. These passwords are
confidential and may only be given to persons authorized to access such setting
levels
The responsibility for setting the parameters lies with the person who – in
accordance with his access rights – made changes to the respective setting level
In particular, the OEM (burner and / or boiler manufacturer) assumes
responsibility for the correct parameter settings in compliance with the standards
covering the specific applications (e.g. EN 267, EN 676, EN 746-2, etc.).
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1.9 Standards and certificates
Applied directives:
Low-voltage directive 2014/35/EC
Directive for pressure devices 2014/68/EC
Gas Appliances Regulation (EU) EU/2016/426
Electromagnetic compatibility EMC (immunity) *) 2014/30/EC
*) The compliance with EMC emission requirements must be checked after the burner management
system is installed in equipment
Compliance with the regulations of the applied directives is verified by the adherence to
the following standards / regulations:
Automatic burner control systems for burners and appliances
burning gaseous or liquid fuels
DIN EN 298
Safety and control devices for gas burners and gas burning
appliances - Valve proving systems for automatic shut-off
valves
DIN EN 1643
Gas/air ratio controls for gas burners and gas burning
appliances - Part 2: Electronic types
DIN EN 12067-2
Safety and control devices for burners and appliances
burning gaseous and/or liquid fuels — General requirements
DIN EN 13611
Safety and control devices for gas burners and gas-burning
appliances - Particular requirements
Part 1: Automatic and semi-automatic valves
ISO 23552-1
Automatic electrical controls for household and similar use
Part 2-5:
Particular requirements for automatic electrical burner control
systems
DIN EN 60730-2-5
The relevant valid edition of the standards can be found in the declaration of
conformity!
Note on DIN EN 60335-2-102
Household and similar electrical appliances - Safety - Part 2-102:
Particular requirements for gas, oil and solid-fuel burning appliances having electrical
connections. The electrical connections of the LMV37.4 comply with the requirements of
EN 60335-2-102.
EAC Conformity mark (Eurasian Conformity mark)
ISO 9001:2015
ISO 14001:2015
OHSAS 18001:2007
China RoHS
Hazardous substances table:
http://www.siemens.com/download?A6V10883536
Type
LMV37.400A2 --- --- --- ●●●●
LMV37.420A1 ●●●●●●●
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1.10 Service notes
If fuses are blown, the unit must be returned to Siemens (refer to chapter
Warning notes)
Error diagnostics can only be made via the LMV37.4 (BC interface)
Note!
Only authorized persons may replace the fuse (according to EN 298-1, chapter 9.2.r)
1.11 Life cycle
The burner management system has a designed lifetime* of 250,000 burner startup
cycles which, under normal operating conditions in heating mode, correspond to approx.
10 years of usage (starting from the production date given on the type field). This
lifetime is based on the endurance tests specified in standard EN 298.
A summary of the conditions has been published by the European Control
Manufacturers Association (Afecor) (www.afecor.org).
The designed lifetime is based on use of the LMV37.4 according to the manufacturer’s
Data sheet and Basic documentation. After reaching the designed lifetime in terms of
the number of burner startup cycles, or the respective time of usage, the LMV37.4 is to
be replaced by authorized personnel.
* The designed lifetime is not the warranty time specified in the Terms of Delivery
1.12 Disposal notes
The unit contains electrical and electronic components and must not be disposed of
together with household waste. Local and currently valid legislation must be observed.
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2 Makeup of structure / function
description
The LMV37.4 is a microprocessor-based burner management system with matching
system components for the control and supervision of forced draft burners of medium to
high capacity.
Integrated in the LMV37.4 are:
Burner management system complete with valve proving system
Electronic fuel-air ratio control system for a maximum of 2 SQM3 or SQN1
actuators
Control of VSD air fan
Modbus interface
Figure 4: System structure
Example: Modulating gas burner
The system components (AZL2, actuators) are connected directly to the LMV37.4. All
safety-related digital inputs and outputs of the LMV37.4 are monitored by a contact
feedback network.
The diagram shows the maximum functionality of the LMV37.4. The actual functions are
to be determined based on the respective execution / configuration.
2.1 For Europe
For intermittent operation in connection with the LMV37.4, the ionization probe or the
QRA, QRB or QRC optical flame detectors can be used. Continuous operation is
possible only when using an ionization probe.
2.2 For North America
For intermittent operation could in connection with the LMV37.4, the ionization probe or
the optical flame detector QRA or QRB can be used. Continuous operation is
possible only when using an ionization probe.
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