Limitation Of The Load Range; With / Without Auxiliary Actuator - Siemens LMV51 Series Basic Documentation

Limitation of the
load range
With / without
auxiliary actuator
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The curves are defined by the 2 limits «Low-fire» (part load) and «Nominal load»
(maximum load).
In certain cases, it has proven practical to limit the burner's output, either temporarily or
permanently.
This limitation of the burner's working range can make sense in both directions. The
burner's working range then looks as follows:
Pos.
7550d06E
Limited working range
The usable output range always lies within the defined curves. This means that if the
minimum load is smaller than the low-fire load, loads below the low-fire load will be
disregarded. And if the maximum load is greater than the high-fire load, loads above the
high-fire load will be disregarded.
If the minimum load is greater than or equal to the low-fire load, the minimum load
assumes the role of the low-fire load, that is, after ignition, the minimum load will be
considered.
The 2 parameters «Minimum load» and «Maximum load» can be set depending on the
type of fuel burnt, whereby:
Low-fire load £ minimum load £ maximum load £ nominal load
Parameter: MinLoadGas
Parameter: MaxLoadGas
Parameter: MinLoadOil
Parameter: MaxLoadOil
If the auxiliary actuator is not required, it must be deactivated. This can be selected
separately for both types of fuel.
Parameter: AuxActuator (deactivated / activated)
Basic Documentation LMV51...
4 Fuel / air ratio control (FARC)
AIR
FUEL
AUX
Load
CC1P7550en
29.05.2002