Speed Control; Torque Control - ABB DCS 600 Manual
Dcs thyristor power converters
for dc drive systems
25 to 5150 a
6 to 4900 kw
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Also See for DCS 600:
- Operating instructions manual (80 pages) ,
- Manual (62 pages) ,
- Service manual (126 pages)
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3.4 Speed Control
The speed controller is located in the AMC Board.
Speed reference
The source of the reference is depending on the
operating mode.
Advant control,
Field bus interface
DrivesWindow
Panel CDP312
Analogue inputs
Speed reference features:
• Speed reference limiter
• Speed ramp with emergency stop
• Variable slope rate
• Speed correction
• Reference for inching before the ramp
• 2 different references for inching behind the
ramp
Speed measurement
The actual speed may be calculated from arma-
ture voltage and flux (field current) or measured
with analogue tacho or pulse encoder.
Controller part features
• PID controller
• 2 first order low pass filters
• Window control
• Acceleration compensation
• Speed and torque adaptation
• Droop
• Additional torque references
• Torque limitation and gear backlash function
(the integral part of the controller is set to a
suitable value on limitation)
• Oscillation damping (band rejection filter for
speed error)
The diagram Fig. 3.7/2 shows the functionality of
the speed reference chain as well as of the speed
controller.
II F 3-4
remote mode, DDCS
on AMC Board
local mode, DDCS
on AMC Board
local mode, connec-
tor on CON-2
local I/O mode
3.5 Torque Control
Flux and Torque Calculation
These are generally open loop. The flux is
adjusted by the field current. The reference of the
field current is generated by the superimposed
armature voltage control.
The torque is adjusted by the armature current.
The conversion from torque to current reference
is done by means of the calculated flux (based on
the field current and saturation characteristic).
Torque reference features:
• Torque reference A with 1st order filter and
load share
• Torque reference B with torque ramp
• Torque reference limiter
• Torque correction and torque step
• Torque correction by means of analogue in-
put 1
A good behaviour in the field weakening re-
quires speed measurement by tacho or encoder.
A simplified scheme of the torque reference
chain is given in diagram fig. 3.7/2.
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