Siemens LMV5 Series Basic Documentation page 235

General
Basic diagram
LMV51...
Configuration of the
basic unit (BU)
LMV52...
configuration of
the basic unit (BU)
Siemens Building Technologies
HVAC Products
17 Addendum 3: Variable speed drive
(VSD) module
(Only for use with the LMV5x.200 and AZL51.XXB)
The VSD module is an extension to the LMV5... burner control system and is used for
the control of VSD that ensure safety-related supervision of the fan speed.
2 fuel meters (oil and gas) can be connected as an option.
Gas
X71
Required speed 0/4...20 mA
Meter
Oil
LMV5x.200A.
X72
Meter
7550b12e/0903
M M
ACT oil ACT gas
The auxiliary actuator can be parameterized on the basic unit, depending on the type of
fuel burnt. The function offers 2 choices: Air damper or VSD.
Parameter:
Aux Actuator (deactivated / activeDamper / active VSD)
The «Damper» configuration corresponds to the previous function of the LMV51.000A2
and LMV51.100A2.
If «VSD active» is configured, it is used in place of the auxiliary actuator. This means
that with all curve and position settings, «Auxiliary» refers to the VSD.
Owing to the system characteristics of the LMV51.2..., VSD operation always demands
an air damper.
This means that an LMV51.2... system must be equipped with at least one fuel actuator,
one air actuator and one VSD («VSD active»).
On the LMV52.200..., the VSD option can be selected in addition to the actuators.
Parameter:
VSD (deactivate / activate / air influen)
Here, it is also selected whether the VSD shall be used in connection with O2 trim
control.
Basic Documentation LMV51...
17 Addendum 3: Variable speed drive (VSD) module
Release
X73
Alarm 0...24 V
X70
M
ACT air
VSD
M
Sensor disk
L
Sensor
Actual speed
235/278
CC1P7550en
01.10.2003