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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 18 Addendum 3: Variable speed drive (VSD) module 13.08.2004
18 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.
M
ACT gas ACT air
M
ACT oil
Sensor
L
Sensor disk
LMV5x.2...
Gas
Oil
7550b12e/0704
Meter
Meter
MM
Actual speed
X73
X71
X72
X70
Release
Required speed 0/4...20 mA
Alarm 0...24 V
VSD
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 con-
trol.
General
Basic diagram
LMV51...
Configuration of the
basic unit (BU)
LMV52...
configuration of
the basic unit (BU)
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