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Siemens Building Technologies Basic Documentation LMV51... CC1P7550en
HVAC Products 6 Temperature or pressure controller (internal load controller LC) 01.10.2003
BACS as control with digital predefined load via bus.
The LMV5... system is connected to a BACS via the AZL5… and an external bus
interface (e.g. eBus or Modbus).
The BACS contains the controller and transmits the load (manipulated variable) and the
heat demand signal to the LMV5... system.
In this operating mode, the load controller inside the LMV5... is not required.
AZL
CAN module
(basic unit)
FARC (BU)
Demand
for heat
BC (BU)
Manipulated variable,
demand for heat
Manipulated variable,
demand for heat
CAN bus
7550b06E/0202
Internal
load controller
Manipulated
variable
0...100 %
e-bus
interface
e-bus
BMS
Jack X72
-Predefined output
-Demand for heat
6.3.1 Operating mode changeover to internal load controller
To improve availability, a potential-free contact at inputs X62.1/ X62.2 can be used to
switch from any of the other operating modes to the internal load controller. In that
case, setpoint W1 applies.
Note:
When switching to operating mode 2 by means of an external contact, parameter
«LC_OptgMode» set by the AZL5... will not be switched over. If one of the external
operating modes was selected with the AZL5..., the internal LC parameter will no longer
be offered for making settings. For this reason, to set the internal LC, parameter
«LC_OptgMode» must first be set to «IntLC». Then, the LC operating mode must be
set to the desired external operating mode.
To ensure that controller input X5-03 will not be valued when changing to operating
mode 1 (ExtLC X5-03), the controller input at (ExtLC X5-03) should be deactivated. In
operating mode 1 (ExtLC X5-03), the input is nevertheless active. Then, when changing
to the internal load controller, the controller input is deactivated.
Parameter: Input Controller (activated / deactivated)
Operating mode 6
(Ext LC bus)
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