Bosch rexroth MCL, Project Planning Manual

Page: 181 / 206

14.5 Determining the polarity of the linear scale
In order to avoid direct feedback in the velocity control loop, the effective di‐
rection of the motor force and the count direction of the length measuring
system must be identical.
Different effective directions of motor force
and count direction of the encoder system
cause uncontrolled movements of the motor
upon switch-on!
WARNING
⇒ Secure against uncontrolled movement
⇒Setting of the effective direction of the motor force identically to the counting
direction of the length measuring system
Effective direction of motor force The following applies for setting of the correct encoder polarity:
The effective direction of the motor force is always positive in the direction of
the cable connection of the primary part.
① Force direction
Fig. 14-2: Effective direction of motor force
Effective direction of the motor
force = Counting direction of the
length measuring system
In case of motion of the primary part in the direction of the cable connection,
the counting direction of the length measuring system must also be positive:
① Force direction
② Counting direction
③ Length measuring system
Fig. 14-3: Effective direction of the motor force = Counting direction of the
length measuring system
MCL Ironless Linear Motors 173/197
Commissioning, operation and maintenance
R911330592_Edition 06 Bosch Rexroth AG