Siemens LMV5 Series Manual page 22

Function of VSD (only LMV51.3... / LMV52.2... with AZL52... and LMV52.4...)
General
Basic diagram
Speed feedback signal
For more detailed information about the AGG5.310, refer to Basic Documentation P7550
22/39
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The VSD module is an extension to the LMV52.2... and is used for the control of a VSD
that ensures safety-related supervision of the fan speed.
2 fuel meters (oil and gas) can be connected as an option.
A VSD can be connected to the VSD module integrated in the LMV52.2... The VSD is
controlled via an analog current output and a potential-free release contact. Evaluation
of the alarm feedback signal from the VSD is accomplished with a 0...24 V input. When
activated, the LMV52.2... will enter the safety phase. Both motor speed and direction of
rotation are acquired by an inductive sensor. In addition, the asymmetric speed signal
is checked for direction of rotation and plausibility.
The VSD module generates the acceleration / deceleration ramps in accordance with
the parameter settings made on the LMV52.2... The motor speed is adjusted the same
way the speed of the actuators is adjusted. For this reason, the characteristic of the
VSD must be linear. Remove filters, delay and damping elements. The VSD module of
the LMV52.2... ensures that the motor's speed is controlled to the setpoint. The control
range is limited to +15% / -10%. If control range limitation becomes active, the AZL5...
will display it. If this is the case for a longer period of time (→ «Safety time ratio con-
trol»), the LMV52.2... will shut down, delivering the message «Special position not
reached» or «Speed not reached». Speed control is only active with speeds ≥8%.
The auxiliary actuator can be parameterized on the basic unit, depending on the type of
fuel.
The motor's speed can be acquired with different types of sensors. To detect the mo-
tor's direction of rotation with a sensor, a sensor disk with angular steps of 60°, 120°
and 180° is used. The sensor disk generates pulse intervals of 3 different lengths.
Note!
Speed acquisition is safety-related!
We recommend using the AGG5.310 accessory kit.
To enable the acquired speed to be standardized to the range of 0...100%, the speed
corresponding to 100% must be parameterized (→ «Standardization of speed»).
or Mounting Instructions M7550!
M
CC1N7550en
24.05.2011