Table of Contents
Advertisement
4.13 Control box for the air/fuel ratio (LMV52...)
Warnings
To avoid accidents, material or environmental
damage, observe the following instructions!
The LMV52 control box... is a safety device! Avoid
WARNING
opening or modifying it, or forcing its operation. Ri-
ello S.p.A. cannot assume any responsibility for
damage resulting from unauthorised interven-
tions!
Risk of explosion!
An incorrect configuration can provoke fuel over-
charging, with the consequential risk of explosion!
Operators must be aware that incorrect settings
made on the AZL5... display and operating unit
and incorrect settings of the fuel and / or air actu-
ator positions can lead to dangerous burner oper-
ating conditions.
All interventions (assembly and installation operations,
assistance, etc.) must be carried out by qualified personnel.
Before modifying the wiring in the LMV52 control box con-
nection area, fully disconnect the system from the power
supply (omnipolar separation). Check the system is not pow-
ered and cannot be accidentally reconnected. Failure to do
this will lead to the risk of electrocution.
Protection against electrocution from the LMV5... control box
and all connected electric components is obtained with cor-
rect assembly.
Before any intervention (assembly and installation opera-
tions, assistance, etc.), ensure the wiring is in order and that
the parameters are correctly set, then make the safety
checks.
Falls and collisions can negatively affect the safety func-
tions.
In this case, the control box must not be operated, even if it
displays no evident damage.
In programming mode, the position check of actuators and
VSD (checking electronic fuel / air ratio control) is different
from the check during automatic operation.
As for automatic operation, the actuators are guided
together to the positions requested and, if an actuator does
not reach the position requested, adjustments are made until
the position is actually reached. However, in contrast to
automatic operation, there are no time limits to these correc-
tive actions.
The other actuators maintain their positions until all actua-
tors have reached the positions currently required.
This is absolutely important to set the fuel / air ratio control
system.
During the time the fuel / air ratio curves are being pro-
grammed, the person making the plant settings must continu-
ously monitor the quality of the combustion process (e.g. by
means of a flue gas analyser).
Also, if combustion levels are poor, or in the event of danger-
ous situations, the commissioning engineer must take
appropriate action (e.g. switching off manually).
To ensure the safety and reliability of the LMV5... system, the fol-
lowing instructions must also be followed:
–
avoid conditions that can favour the development of conden-
sate and humidity. Otherwise, before switching on again,
make sure that the entire control box is perfectly dry!
–
Static charges must be avoided since they can damage the
control box's electronic components when touched.
20182250
Technical description of the burner
14
GB
Mechanical structure
The LMV5... control box is a system to check the burners, based
on a microprocessor and equipped with components to adjust
and monitor medium and large capacity forced draught burners.
The base control box of the LMV5... system incorporates the fol-
lowing components:
•
Burner adjustment device with system for checking the seal
of the gas valves
•
Electronic fuel/air ratio monitoring device with a maximum of
6 (LMV52...) actuators
•
Optional PID temperature / pressure controller (load control-
ler)
•
Optional VSD module Mechanical design.
D9301
Fig. 7
Advertisement
Table of Contents
