4.4 Construction group
description
Motor
The motor is a 24-V-DC, whose motor shaft powers a worm gear.
The lift speed depends on the load. The motor unit is surrounded by
and fused with the multi-shell plastic housing. The plastic housing-
cannot be opened. A bracket clasps around the plastic housing.
Brake
The brake is located in the motor unit and takes care of the decel-
eration of the spindle as well as the stabilization in idle mode.
The maximum self-preservation force of the brake in idle mode
can be found in the respective data sheet (
†
Appendix
).
Gear unit
The worm gear is directly powered by the motor shaft, which
depending on the version, moves a trapezoidal sliding spindle or ball
bearing spindle.
Linear unit
The actuator extends and retracts the push tube. The actuator is
surrounded and protected by the casing tube. The footer of the
actuator is connected with the threaded spindle via the ball screw
nut.
The linear unit is connected with the motor unit via a bayonet
joint. The bayonet joint is protected by a plastic cover which also
functions as a locking mechanism and which must not be removed.
4.5 Requirements for third party
control units (mandatory in
medical application)
Control units not approved by SKF for MAX1 and MAX3 actuators,
are treated as third party control units.
!
Note!
It is strongly recommended to use original SKF controls
for operation of the MAX1 and MAX3 actuators. If third party
control are Used, there must be good documented evidence
that the requirements listed below are complied with.
The secondary circuit of third party control units must be designed
as an over voltage category 1 circuit. The third party control unit
must be fitted with an overload safety cut-off. The maximum power
input to the device should be only 0,5 A above the nominal value.
The maximum shut-off value may be only 1 A above the nominal
value.
For example: The maximum power consumption is 12 A. The
recommended shut-off value is 12,5 A, the maximum cut-off value
is 13 A.
28
Summary of Contents for Matrix MAX1
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