Bosch rexroth MCL, Project Planning Manual

Page: 127 / 206

The asymmetric capacity can be reduced to a minimum by exact‐
ly aligning the length measuring system and the primary and sec‐
ondary parts to each other, and by an internal axis error correc‐
tion.
Arrangement of primary parts in a row (Gantry)
Primary parts in feed direction can also be arranged in a row, mechanically
coupled.
① Control unit
② Controller (2 pcs.)
③ Length measuring system (1 scale, 2 scanning heads)
Fig. 9-27: Gantry arrangement (primary parts in a row)
9.13.3 Arrangement of secondary parts
During assembly, you must not heed the arrangement of the secondary parts.
Due to construction of MCS, a "polarity reversal" - arrangement of several
secondary parts within a path is prevented. The order of magnetization is un‐
changed by a 180° - rotation of secondary parts.
Please observe the notes in
chapter 13.4 "Air-gap, parallelism and symmetry
of the motor components" on page 160 and chapter 13.5 "Fastening secon‐
dary part" on page 161 about alignment and fastening of secondary parts.
9.13.4 Vertical axis
Uncontrolled movements! Risk of injuries!
CAUTION
Motors in vertical axes are not self-locking when de-energize. Prevent a sink‐
ing of the axis with appropriate holding devices.
● On vertical axis, the use of an absolute measuring system is
recommended.
● Incremental measuring systems can only be used, if a Hall
unit is additionally used beside the holding device.
Weight compensation An additionally used weight compensation ensures that the motor is not ex‐
posed to an unnecessary thermal stress that is caused by the holding forces
and the acceleration capability of the axis is independent of the motion direc‐
tion. The weight compensation can be pneumatic or hydraulic. Weight com‐
pensation with a counterweight is not suitable since the counterweight must
also be accelerated.
MCL Ironless Linear Motors 119/197
Application and construction instructions
R911330592_Edition 06 Bosch Rexroth AG