SIEMENS
SINAMICS DCM
DC Converter and Control Module
General information
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Siemens D 23.1 · 2014
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Function
(continued)
Function
Description
Functions of the closed-loop control in the field circuit
EMF controller
The EMF controller compares the setpoint and actual value of the EMF (induced motor voltage) and enters the setpoint
for the field current controller. This therefore permits field weakening control that is dependent on the EMF.
The EMF controller operates as PI controller; P and I components can be adjusted independently of one another and/or
the controller can be operated as pure P controller or pure I controller. A pre-control function operates in parallel to the
EMF controller. Depending on the speed, it pre-controls the field current setpoint using an automatically recorded field
characteristic (refer to the optimization runs). There is an adding point after the EMF controller, where the supplementary
field current setpoints can be entered either via a connector, via an analog input or a serial interface. The limit is then
effective for the field current setpoint. In this case, the field current setpoint can be limited to a minimum and a maximum
value that can be set independently from one another. The limit is realized using a parameter or a connector. The mini-
mum for the upper limit or the maximum for the lower limit is effective.
Field current controller
The field current controller is a PI controller – where
K
p
and
T
n
can be independently set. It can also be operated as pure
P and I controller. A pre-control function operates in parallel to the field current controller. This calculates and sets the
firing angle for the field circuit as a function of current setpoint and line supply voltage. The pre-control supports the
current controller and ensures that the field circuit has the appropriate dynamic performance.
Gating unit
The gating unit generates the firing pulses for the power section thyristors in synchronism with the line supply voltage in
the field circuit. The synchronization is detected in the power section and is therefore independent of the electronics
power supply. The timing of the firing pulses is defined by the output values of the current controller and the pre-control.
The firing angle limit can be set using parameters. In a frequency range from 45 to 65 Hz, the gating unit automatically
adapts itself to the actual line supply voltage.
Communication between drive components
DRIVE-CLiQ
Communication between SINAMICS components is realized using the standard internal SINAMICS interface
DRIVE-CLiQ (this is an abbreviation for Drive Component Link with IQ). This couples the Control Unit with the connected
drive components (e.g. DC Converter, Terminal Modules etc.).
DRIVE-CLiQ provides standard digital interfaces for all SINAMICS drives. This permits modularization of the drive
functions and thus increased flexibility for customized solutions (allows power and intelligence to be separated).
The DRIVE-CLiQ hardware is based on the Industrial Ethernet standard and uses twisted-pair cables. The DRIVE-CLiQ
line provides the transmit and receive signals and also the 24 V power supply.
Setpoints and actual values, control commands, status feedback signals and electronic rating plate data of the drive
components are transferred via DRIVE-CLiQ. Only original Siemens cables must be used for DRIVE-CLiQ cables. As a
result of the special transfer and damping properties, only these cables can guarantee that the system functions per-
fectly.
SINAMICS Link
SINAMICS Link allows data to be directly exchanged between several (2 to 64) Control Units. A higher-level master is
not required.
The following Control Units support SINAMICS Link:
• CU320-2
• Advanced CUD
For use of SINAMICS Link, all of the Control Units must be equipped with the CBE20 Communication Board (option G20).
In addition, a memory card (options S01, S02) is required for the Advanced CUD. Communication can either be
synchronous (only CU320-2) or non-synchronous or a combination of both. Each participant can send and receive up to
16 process data words.
For instance, SINAMICS Link can be used for the following applications:
• Torque distribution for n drives
• Setpoint cascading for n drives
• Load distribution of drives coupled through a material web
• Master/slave function
• Couplings between SINAMICS units
© Siemens AG 2014