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General
Basic diagram
LMV51...
Configuration of the
basic unit (BU)
LMV52...
configuration of
the basic unit (BU)
17 Addendum 3: Variable speed drive
(VSD) module
(Only with LMV52.2... and AZL52...)
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.2...
X72
Meter
7550b12e/0704
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.
The «Damper» configuration corresponds to the previous function of the LMV51.000B2
and LMV51.100B2.
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»).
Parameter
Aux Actuator (deactivated / activeDamper / active VSD)
On the LMV52.2..., the VSD option can be selected in addition to the actuators.
Here, it is also selected whether the VSD shall be used in connection with O2 trim con-
trol.
Parameter
VSD (deactivate / activate / air influen)
Release
X73
Alarm 0...24 V
X70
M
ACT air
53
VSD
M
Sensor disk
L
Sensor
Actual speed
5921
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