Holding Brake - Bosch rexroth MKE Operating Manual

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Features and functions
Couplings
The machine construction and the drive elements
used must be carefully adapted to the motor type
so as to make sure that the load limits of the shaft
and the bearing are not exceeded.
Remark: When extremely stiff couplings are
attached, the revolving radial force may cause an
impermissibly high load on the shaft and bearing.
Bevel gear pinion or helical drive pinion
Due to thermal expansion, the DE side of the
drive shaft can be displaced by up to 0.6 mm
in relation to the motor housing. If helical drive
pinions or bevel gear pinions directly attached
to the output shaft are used, this change in the
lengths will lead to
•
a shift in the position of the axis, if the driving
pinions are not axially fixed on the machine
side.
•
a thermally dependent component of the
axial force, if the driving pinions are axially
fixed on the machine side. This causes the
risk of exceeding the maximum permissible
axial force or of the gear backlash increasing
to an impermissible degree.
•
Damage of the NDE bearing by exceeding the
maximum permissible axial force.
Remark: It is recommended to use drive ele-
ments with integrated bearings and mount them
on the motor shaft via axially compensating cou-
plings.
Bosch Rexroth AG
MKE Synchronous Servomotors
6.2.8

Holding brake

WARNING
Danger to life or high damage to property, igni-
tion and explosion hazard due to inappropriate
use!
In order to prevent danger due to ignitable gases
or explosive dust-air mixtures in the vicinity of
the motors, the user must make sure that the
holding brake does not present a source of igni-
tion in the normal service. For this reason, the
holding brake must never be used outside the
design parameters and operating conditions!
−
Any commissioning and maintenance works
must only be carried out in non-explosive
environments.
−
The brakes must be designed so as to fulfill
their function in normal service, if they are
installed and used as intended.
−
The holding brake integrated in the motor
must only be used at standstill and never as
EMERGENCY STOP brake to stop the motor,
see P-0-0119, Optimal shutdown(Indra-
Drive firmware - functional description).
−
The holding brake must not be used to brake
or stop the motor or coupled loads from
higher speeds or velocities.
MKE motors can optionally be provided with
permanent magnet brakes. The backlash-free
holding brakes are operated according to the
"electrically-released" principle (closed-circuit
principle) and open upon applying the switching
voltage.
•
Number of operating cycles ≥ 5,000,000
•
The holding brakes with emergency stop
function are intended to secure motor shafts
at standstill (normal operation). The holding
brakes are no operation brakes to decelerate
motors in operation from speed.
•
Emergency stop situations are not a normal
operation.
R911414374, Edition 01