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 12 of 20
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Installation Conditions
The eccentricity of the shaft end in relation to the mounting
pitch circle must not exceed 0.2 mm.
The positional tolerance of the threads for the cap screws (6)
must not exceed 0.2 mm.
The axial run-out deviation of the screw-on surface to the
shaft must not exceed the permitted axial run-out tolerance
of
0.1 mm
for Size 250 and of
0.125 mm
for Size 500, ac-
cording to DIN 42955. The reference diameter is the pitch
circle diameter for securement of the brakes.
Larger deviations can lead to a drop in torque, to continuous
grinding of the rotor (4) and to overheating.
The tolerances of the hub bore and the shaft must be se-
lected so that the hub toothing (1) is not widened. Widening
of the toothing leads to the rotor (4) jamming on the hub (1)
and therefore to brake malfunctions.
Recommended hub
– shaft tolerance H7/k6.
The max. permitted joining temperature of 200 °C must not
be exceeded.
A suitable counter friction surface (flange surface) made of
steel or grey cast iron must be provided for the rotor (4).
Sharp-edged interruptions on the friction surfaces must be
avoided.
Surface quality in the friction area of the friction surface:
Ra 1.6 µm
When machining grey cast iron, please make
sure that the cast tips are removed.
The rotor (4) and brake surfaces must be oil and grease-
free.
The toothings of the hub (1) and the rotor (4) must not be
oiled or greased.
Friction value-increasing surface treatments are not permit-
ted.
Please abstain from using cleaning agents containing sol-
vents, as they could affect the friction material.
Protect the rotor from rusting up / seizing up against the
bearing shield / the flange plate (customer-side). We recom-
mend tried and tested anti-corrosion measures for the
mounting surface:
dry, oil-free phosphate layers
hard chromium and nitriding
Installation (Figs. 1 to 10)
1. Mount the hub (1) onto the shaft, bring it into the correct po-
sition (the length of the key should lie over the entire hub)
and secure it axially, e.g. using a locking ring.
2. Measure the rotor thickness of the new rotor (4).
The nominal dimension acc. Table 1 must be given.
3. Push the rotor (4) onto the hub (1) by hand (the rotor collar
should be facing away from the machine wall). The rotor
toothing must lie over the entire length of the hub (1).
Make sure that the toothing moves easily.
Do not cause any damage!
4. If necessary (dependent on Type), insert the O-ring (12) into
the axial groove of the coil carrier (2).
5. Push the rest of the brake over the hub (1) and the rotor col-
lar (4) (the fixing holes should align with the bores in the ma-
chine wall). The shoulder screws (8) prevent the individual
components from falling apart.
They do not affect the brake function and must not be re-
moved during installation.
6. Secure the brake with the cap screws (5) and mounted seals
(Item 11 / dependent on Type) onto the machine wall evenly
all around
using a torque wrench and a tightening torque
of 45 Nm.
7. Check the air gap, see page 16.
8. Establish the electrical connection of the brake.
Hand Release
The brakes are suitable for the optional attachment of a hand re-
lease device.
The hand release including separate Installa-
tion Instructions can be ordered at the manu-
facturer’s stating the article or serial number of
the respective brake.
In order to install the hand release, the brake
must be removed from the machine wall and
de-energised!
The hand release devices have already been mounted manufac-
turer-side for designs Type 891.0_1.1.
