
Additional Modes
30
The direction of rotation is set with the ADR and
ADL commands.
ADR
➔
with a positive voltage the motor
rotates in the positive direction (right).
ADL
➔
with a negative voltage the motor
rotates in the negative direction (left).
The
AC
- and
SP
-values are also applicable in
analog positioning mode making soft accele-
ration and braking possible.
Positioning with a Pulse-Width
Modulated Signal
Positioning will be controlled by a PWM from
the analog input when the commands
APCMOD
and
SOR2
are given one after the other. The
pulse duty ration sets the command position
value. A pulse duty ratio of 0.5 (ON time = OFF
time) will set the command position to 0. A
pulse duty ratio larger than 0.5 leads to a
positive command position value and a ratio less
than 0.5 leads to a negative value.
Special Function:
The presence of a Hall Sensor makes it possible to
register the absolute position of the armature
inside of one revolution. That means that in the
event of a power loss the exact position can be
recalled after the power is restored (if the
armature has only moved within one revolution).
With the following commands it is possible to
position the motor inside one revolution with a
voltage ranging from 0 - 10 V even after the
power has been turned off and then on again.
Using an External Encoder to
Measure Actual Position
A processed signal from an external encoder can be
used to precisely measure actual position.
■
The positioning resolution depends on the
resolution of the encoder.
■
Depending on the application, the speed can
either be measured at the encoder or the Hall
Sensor.
■
The external encoder can be fastened directly to
the motor shaft. The encoder can also be fastened
directly to the output shaft of the complete
system enabling highly accurate positioning that
can be optimized at the output stage.
■
The analog Hall Sensors provide the motor
commutation.
■
All other positioning mode functions, for example,
combined motion profiles, can also be used in
conjunction with the external encoder.
ADL
... With a positive voltage the motor will
rotate to a negative position (after
power is restored to the motor it is at a
negative position value ranging
from 0 to –1000)
APCMOD... Switches to analog positioning
LL1000
... Sets maximum position to one revolution.
EEPSAV ... Saves the configuration.
Summary of Contents for MCDC2805 series
Page 58: ...58 Notes ...
Page 59: ...59 Notes ...