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 15 of 20
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Permitted Brake Friction Work
The permitted friction work values dependent on the switching frequency shown in the characteristic curve must not be exceeded, not even
in EMERGENCY STOP operation.
The following diagrams show the permitted friction work values Qr referring to the respective switching frequency for the various brake sizes
and rated speeds (Table 1).
For 60 Hz operation, the max. permitted friction
work values must be reduced to 70 %.
Friction power diagram for RSM 250
– BRE 250
Friction power diagram for RSM 500
– BRE 400
Permitted friction work at other speeds (customer specific)
The permitted friction work at specific customer speeds can also be calculated using linear interpolation between the maximum speed and
reference speed.
Q
n
= Permitted friction work at customer speed
Q
n ref
= Permitted friction work from friction power diagram for reference speed
Q
n max
= Permitted friction work from friction power diagram for maximum speed
n
= Actual customer speed
n
ref
= Reference speed (see Table 1)
n
max
= Maximum speed (see Table 1)
Q
n
= Q
n ref
-
(Q
n ref
- Q
n max
)
(n
max
- n
ref
)
× (n - n
ref
)
Switching frequency
[1/h]
Perm
itted
frict
ion
w
o
rk
[J
]
Reference speed n
ref
Maximum speed n
max
Switching frequency
[1/h]
Perm
itted
frict
ion
w
o
rk
[J
]
Reference speed n
ref
Maximum speed n
max
