Determining The Polarity Of The Linear Scale - Bosch rexroth MCL Project Planning Manual

MCL Ironless Linear Motors
14.5

Determining the polarity of the linear scale

Effective direction of motor force
Effective direction of the motor
force = Counting direction of the
length measuring system
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.
WARNING
⇒ Secure against uncontrolled movement
⇒Setting of the effective direction of the motor force identically to the counting
direction of the length measuring system
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
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
Commissioning, operation and maintenance
Different effective directions of motor force
and count direction of the encoder system
cause uncontrolled movements of the motor
upon switch-on!
R911330592_Edition 06 Bosch Rexroth AG
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