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Unformatted text preview: rive in local operation The diagram Fig. 3.8/2 shows the functionality of the
speed reference chain as well as of the speed controller. II F 3-4
3ADW000072R0601 DCS600 System description e f 3.7 Torque Generation
Interface between SDCS-AMC-DC 2 board and
DC control board SDCS-CON-2 The major signals exchanged each 2 ms between CON2 and AMC-DC 2 are:
SPEED_ACTUAL speed actual value from
TORQ_USED_REF active torque reference to
In addition, the calculated torque limits are read from
the CON-2 each 8 ms:
TC_TORQMIN Field Current Control Two field exciters can be operated simultaneously for
two different motors.
The first field exciter can be operated with fixed current
reference, in field weakening or with a reduced reference for field heating.
The second field exciter has a fixed current reference
(no field weakening possible). However, it may be
reduced for field heating purposes.
A field reversal control is available for the first field
Optitorque is a special control method where the flux
is reduced at small torque reference. This is available for
drives with and without field reversal.
Armature Current Control The addition of the torque correction TQ_CORR
from an analogue input of CON-2 is done by the
Armature voltage Control This controller enables operation in the field weakening range. It generates the field current reference. At low
speeds the field current is constant and armature voltage is roughly proportional to the speed. At higher
speeds (≥ base speed) the field current reference is
reduced so that the armature voltage doesn’t exceed its
reference. The armature current reference is calculated from torque
reference and flux. Then it is processed by a ramp,
limitation and speed dependent limitation.
The actual value of the armature current is the measured mean value between two firing pulses.
The armature voltage reference is generated by a PI
The firing angle is calculated from this voltage reference
depending on the actual line voltage and the conduction time (adaptation between continuous and discontinuous state of the converter current).
A simplified scheme of the armature current control is
given in diagram fig. 3.8/3. II F 3-5
3ADW000072R0601 DCS600 System description e f 3.8 Software diagrams
Introduction The designation of parameters and signals consist of a
group and a index.
Parameter 23.05 X Index
Fig. 3.8/1: On the following pages the simplified software structure is shown. Additionally there are specific tables for:
• Main Control Word (MCW)
• Auxiliary Control Words (ACW)
• Main Status Word (MSW)
• Auxiliary Status Word (ASW)
• Digital Inputs (Armature converter mode)
• Digital Inputs (Field converter mode)
• Digital Outputs (Armature converter mode)
• Digital Outputs (Field converter mode)
• Analogue Inputs (Armature converter mode) Parameter/signal designation The structure of the software is given. Changes of the
functions or pointers are realized through setting parameters.
This can be done via panel, D...
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This note was uploaded on 08/22/2011 for the course EEE 230 taught by Professor Subramanian during the Spring '07 term at Berkeley.
- Spring '07