Siemens LMV5 Series Manual page 6

Mechanical design
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Building Technologies Division
Industry Sector
The following system components are integrated in the basic unit of the LMV5...:
•
Burner control with gas valve proving system
•
Electronic fuel / air ratio control for use with a maximum of 4 (LMV51...) or 6
(LMV52...) actuators
•
Optional PID temperature / pressure controller (load controller)
•
Optional variable speed drive module (VSD module)
Example:
Dual-fuel burner
- Gas: Modulating
- Oil: 2-stage
The system components (display and operating unit, actuators and O2 module) are in-
terconnected via a CAN bus system. Communication between the bus users is ensured
via a reliable, system-based data bus. For safety reasons, integration of the bus into
external CAN bus systems is not allowed. All safety-related digital inputs and outputs of
the system are constantly monitored by a contact feedback network (CFN). For flame
supervision in connection with the LMV5... and continuous operation, the QRI... infrared
flame detector, the QRA7... UV flame detector or an ionization probe can be used and,
for intermittent operation, the optical flame detectors type QRB... or QRA2..., QRA4.U,
QRA10... with AGQ1... (AC 230 V).
The burner management system is operated and programmed with the help of the dis-
play and operating unit (AZL5...) or a PC tool. The AZL5... features clear-text display
and menu-driven operation, thus offering straightforward operation and targeted diag-
nostics. To simplify diagnostics, the display shows the operating states, the type of fault
and the point in time the fault occurred. The different parameter setting levels for the
burner / boiler manufacturer and the heating engineer are protected by passwords. Ba-
sic settings that the plant operator can make on site do not demand a password. Fur-
ther, the display and operating unit serves as an interface to higher level systems such
as building automation and control systems (BACS) or a PC which has the ACS450
software installed. Among other features, the unit affords convenient readout of settings
and operating states, parameterization of the LMV5..., and trend logging.
CC1N7550en
24.05.2011