• DOK-DIAX02-DDS02.1*ANA-ANW1-EN-E1,44 • 12.96
12
ENA3A-Abb0.25/InbetrDDS
X
SERCOS
interface
M
3
~
SERCOS
interface
Fine interpolation
Position, velocity,
torque control
Current vector controlling
Parametrization, Diagnostics
PWM-
current regulation
Current actual value
NC control
Digital intelligent drive controller
with SERCOS interface
Digital
AC servo motor
Rotor position
Feedback
Drive
micro-
processor
Linear scale
234554
Zum Mech
Überblick
1
Parameters
Diagnoses
Operating data
The SERCOS interface is a serial real-time communication system
between NC controls and drives which has been proposed for standardi-
zation in a draft standard (DIN IEC/TC 44) drawn up by a joint workgroup
made up of representatives from the Verein Deutscher Werkzeug-
fabriken e.V. (VDW) [Association of German Machine Tool Factories]
and from the trade association for Electrical Drives of the Zentralverband
Elektrotechnik und Elektroindustrie e.V.(ZVEI) [Central Association of
Electrical Engineering and the Electrical Industry].
SERCOS interface
Fig. 2: CNC axis with digital three-phase AC servo drive and SERCOS interface
1. The digital intelligent AC servo drive
The full range of possibilities and benefits of digital intelligent drives can
only be exploited through the SERCOS interface.
These include:
– Display and entry of all internal drive data, parameters and diagnoses
via the SERCOS terminal of compatible NC controls.
– Exploitation of the high speed resolution of 0.0001 rpm up to maximum
speed.
– Exploitation of the drive’s internal fine interpolation and position control
loop (cycle time 0.250 ms, resolution 0.00001 mm to 180 m/min with
linear scales with a graticule constant of 20 µm free of following error)
for positioning, contouring and C-axis mode including the high-velocity
range.
– Normalization of position, velocity, acceleration and load data as well
as adaptation of machine parameters, such as gearbox, spindle pitch,
etc.
– Reducing the complexity of NC controls, wiring and position encoders.
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