Siemens LMV5 Series Basic Documentation page 236

General
Connection diagram
Release contact
X73-1 / -2
Alarm input
X73-3
Analog output to
the VSD X73-4
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17.1 VSD module (VSD-M)
A VSD can be connected to the VSD module integrated in the LMV5x.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
output. When activated, the LMV5x.2... will enter the safety phase.
Both motor speed and direction of rotation are acquired by an inductive sensor. The
asymmetric speed signal is checked for direction of rotation and plausibility.
The VSD module generates acceleration and deceleration ramps in accordance with the
parameters settings made on the LMV5x.2...
The motor speed is adjusted according to the same principle as that used with actuator
adjustments.
The VSD module of the LMV5x.2... controls the motor speed to the setpoint. The control
range is limited to +15 % / -10 %.
If control range limitation becomes active, an appropriate display appears on the AZL5...
If that is the case over a longer period of time ( → «Safety Time Ratio Control»), the
LMV5x.2... will be shut down and the message «Special Position not reached» or
«Speed not reached» will appear.
Speed control is active for speeds ≥ 8 %.
17.1.1 Inputs / outputs
1 1
X 7 0
75 50 a11
M O TO R S PEE D IN PU T F U EL C O U N TER IN P U T
The LMV5x.2... has a potential-free release contact for the VSD. This contact will be
activated when a motor speed other than zero is required.
≤ AC / DC 24 V (protective extra low-voltage)
Voltage:
Current: 5 mA to 2 A
The alarm input of the LMV5x.2... will be connected to the alarm output of the VSD. In
the event of an alarm, safety shutdown will be triggered as a minimum requirement.
Voltage active: DC 12...24 V
Voltage inactive: < DC 4 V
This output is used for delivering the preselected speed setpoint to the VSD.
Current:
Output load:
Resolution:
Cross-sectional area of wire:
Basic Documentation LMV51...
17 Addendum 3: Variable speed drive (VSD) module
1
X71 X72
GA S O IL
(alarm ON)
(alarm OFF)
0 / 4...20 mA ≈ 0...105 % (→ «Standardization of Speed»)
max. 750 Ω (burden), short-circuit-proof
0,1 %
2
≥ 0,1 mm
1
X 73
F R EQ U E N C Y C O N VER T ER
CC1P7550en
01.10.2003