Installation and Operational Instructions for BRE250 and BRE400
ROBA-stop
®
-M brake Type 891.
0_ _._
Sizes 250 and 500
(E070 09 203 001 4 EN)
31/10/2019 TK/MW
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten, Germany
Phone: +49 8341 804-0, Fax: +49 8341 804-421
Page 13 of 20
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Definition of the Braking Torques
Static braking torque
Effectively averaged, fully developed torque for slipping brake
with smallest speed values.
Guideline value: n = 3 [rpm]
Dynamic braking torque
Effectively averaged, fully developed torque in a braking proce-
dure from the output speed up to standstill.
For correct evaluation, a sufficient slip time is
required (sliding speed between 1 m/s and
10 m/s).
The permitted friction work and speed values
must not be exceeded.
Braking Torque Adjustment
The ROBA-stop
®
-M brakes are set manufacturer-side to the
braking torque stipulated on order.
The set torque is stated on the motor Type tag.
Run-in procedure / Conditioning of the friction
lining pairing
The stated brake nominal torques are valid for a run-in / condi-
tioned state of the friction lining pairing in standard climate condi-
tions.
When in new condition and without conditioning of the friction
pairing, the braking torque tolerance may be +40 % / -30 %
Conditioning is necessary:
in new condition
during the operation of the system
EMERGENCY STOP only after brake run-in procedure
Please carry out conditioning of the friction lining pairing
through dynamic braking procedures of the system.
Recommendation:
Approx. Please carry out approx. 5 dynamic braking procedures
at 50 % of the permitted speed n
max
at 25 % of the permitted friction work Q
r zul.
Please observe the following under deviating run-in condi-
tions:
do not use higher speed and/or friction work values
at lower friction work values, increase the number of dy-
namic braking actions to achieve similar total friction works.
A generally valid definition of the parameters
required for the conditioning is not possible due
to the different application possibilities.
The frequency of the friction lining pairing con-
ditioning and the torque inspection must be de-
termined by
the user
depending on the appli-
cation.
If regular conditioning is not possible:
Dimension with a correspondingly higher safety.
Recommendation: Si ≥ 2.0
Attention! The dynamic dimensioning must be taken into account
separately
EMERGENCY STOP
only after brake run-in
procedure
Brake Inspection
(before brake initial operation)
Braking torque inspection:
Please compare the requested braking torque with the
torque stated on the Type tag (10).
Inspect the air gaps:
Air gap “a” (brake de-energised):
The nominal air gap acc. Table 1 must be given.
Release function inspection:
by energising the brake.
The braking torque is not achieved until after the run-in proce-
dure has been carried out. See section “Definition of the Braking
Torques”.
