Limitation Of Modulation Range; End Of Operating Position; Notes On Settings And Parameter Settings - Siemens LMV27.100x2 Basic Documentation

Basic unit with integrated air-fuel ratio control for forced draft burners
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10.4.6 Limitation of modulation range

If the modulation range for stage 1 and stage 2, or stage 3, shall be further restricted, 2
parameters can be used to define a new low-fire and high-fire position.
No.
Parameter
Lower output limit
545
undefined = 20 %
Upper output limit
546
undefined = 100 %

10.5 End of operating position

When there is no more heat request, the LMV27 switches to phase 62. Here, the burner
runs down to low-fire as long as possible before the valves are shut.
The available period of time can be set via parameter 212. If this time is set to the
minimum value, the burner is immediately shut down if there are no more requests for
heat. If the time exceeds 32 seconds, the burner always runs to low-fire. Naturally, it is
also possible to set intermediate times.
No.
Parameter
212
Max. time down to low-fire

10.6 Notes on settings and parameter settings

When making the settings for the electronic air-fuel ratio control system integrated
in the LMV27, it must be ensured that sufficient amounts of excess air are available
because over a period of time, the flue gas values are impacted by a number of
factors, such as air density, 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 accidental or unauthorized transfer of parameters from the
parameter backup of the ACS410 to the LMV27, the OEM (burner or boiler
manufacturer) must enter an individual burner identification for every burner.
Only when this requirement is satisfied does the LMV27 make certain that the
ACS410 does not transfer a parameter set from a plant (with unsuited and possibly
dangerous parameter values) to the LMV27
With the LMV27, it should be noted that the LMV27 characteristics are determined
primarily by the parameter settings and not so much by the type of unit. This means
that – among other considerations – the parameter settings must always be
checked prior to commissioning the plant, and that the LMV27 must never be
transferred from one plant to another without adapting its parameters to the new
plant
When using the ACS410 PC software, the safety notes given in the relevant
Operating Instructions (CC1J7352) must also be observed
The parameter level is password-protected. The OEM assigns individual passwords
to the parameter levels he can access. The unit is supplied with default passwords
entered by Siemens; they must be changed by the OEM. These passwords are
confidential and may be assigned to authorized personnel only
The responsibility for setting parameters is assumed by the person who, in
accordance with the access rights, has made changes on the respective setting
level
In particular, the OEM assumes responsibility for the correct parameter settings
in compliance with the standards covering the specific applications (e.g.
EN 676, EN 267, EN 1643, etc.).
Basic Documentation LMV27...
10 Electronic air-fuel ratio control
97/219
CC1P7541en
17.12.2018

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