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 10 of 20
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Table 1: Technical Data
Size:
250
500
Type:
891.01_._
891.02_._
Nominal braking torque:
250 Nm
400 Nm
Braking torque tolerance (conditioned):
+40% / -20%
+40% / -20%
Braking torque tolerance (without conditioning):
+40% / -30%
+40% / -30%
Reference speed n
ref
:
750 rpm
750 rpm
Max. speed n
max
(brake engagement):
3600 rpm
3000 rpm
Permitted idle speed:
4700 rpm
3800 rpm
Nominal voltage U
N
:
see Type tag
see Type tag
Electrical power at nominal voltage P
N
:
see Type tag
see Type tag
Electrical connection, magnetic coil:
2 x 0.88 mm2
2 x 0.88 mm2
Mass with cap screw, without hand release and without hub:
25.9 kg
35.9 kg
Weight of hub / hand release assembly / hand release bar
0.98 kg / 1.27 kg / 1.28 kg
2.95 kg / 2.46 kg / 1.28 kg
Nominal air gap “a” +0.20/-0.05 (Figs. 2/4/6/8):
0.35
+0.1
-0.05
mm
0.40
+0.2
mm
Max. permitted air gap “a” after wear (Figs. 2/4/6/8)
1)
:
0.95 mm
1.0 mm
Minimal width of the counter friction surface:
14 mm
19 mm
Tightening torque Item 6:
45 Nm
45 Nm
Tightening torque Item 8:
18.5 Nm
18.5 Nm
Rotor thickness “new” (+0.08 mm):
17 mm
18.5 mm
Minimum rotor thickness:
16.4 mm
17.9 mm
Mass moment of inertia (hub + rotor):
71.8 x 10
-4
kgm2
215 x 10
-4
kgm2
Friction work Q
r 0.1
(per 0.1 mm wear):
130 x 10
6
J
170 x 10
6
J
Friction work Q
r ges.
(max. possible friction work related to nominal air
gap):
780 x 10
6
J
1700 x 10
6
J
Duty cycle:
100%
100%
Protection (Type 891.0_ _.0):
IP 54 / IP55
2)
IP 54 / IP55
2)
Protection (Type 891.0_ _.1):
IP 66
IP 66
Ambient temperature:
-20 °C to +40 °C
-20 °C to +40 °C
1)
Customer-side changes of the spring configuration have an effect on the maximum permitted air gap.
2)
When installed, under a fan cover provided by the customer, Protection IP55 is valid.
The stated value Q
r 0.1
is only a reference value for specific friction work values < 0.5 J/mm
2
and sliding speeds < 10 m/s.
Table 2: Changes in switching time t
11
for different spring configurations
Size
Spring configuration
Braking torque
t11
250
8 x D21.5
250 Nm
100%
250
7 x D21.5
218 Nm
160%
250
6 x D21.5
187 Nm
220%
500
14 x D15 + 2 x D24.5
400 Nm
100%
500
11 x D15 + 2 x D24.5
350 Nm
137.5%
