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 11 of 20
your reliable partner
Torque-Time Diagram
Key
M
Br
= Braking torque
M
L
= Load torque
t
1
= Connection time
t
11
= Response delay on connection
t
2
= Separation time
t
4
= Slip time + t
11
U
N
= Coil nominal voltage
Design
ROBA-stop
®
-M brakes are spring applied, electromagnetic safety
brakes, which apply a defined braking effect after the voltage is
switched off or after a voltage failure.
The brakes can optionally be retrofitted with a hand release (arti-
cle number 8265886 for Size 250 or article number 8265888 for
Size 500).
Function
The ROBA-stop
®
-M brake is a spring applied, electromagnetic
safety brake.
Spring applied function (brake):
In de-energised condition, thrust springs (5) press against the ar-
mature disk (3). The rotor (4) is held between the armature disk
(3) and the customer-side machine wall via frictional locking.
The braking torque is introduced into the drive line via the tooth-
ing of the rotor (4) and the hub (1).
Electromagnetic function (release):
Due to the magnetic force of the coil in the coil carrier (2), the ar-
mature disk (3) is attracted against the spring pressure to the coil
carrier (2). The brake is released and the brake rotor (4) with the
hub (1) can rotate freely.
Safety brake function:
The ROBA-stop
®
-M brake brakes reliably and safely in the event
of a power switch-off, a power failure or an EMERGENCY
STOP.
Scope of Delivery / State of Delivery
ROBA-stop
®
-M brakes are pre-assembled.
An optional release monitoring device / wear monitoring device is
installed and set manufacturer-side.
The hand release devices have already been mounted manufac-
turer-side for designs Type 891.0_1.1.
The hub (1) is not included in the standard scope of delivery and
must be ordered separately.
Included loose in delivery are:
- rotor (4)
- cap screws (6)
Additional parts for Type 891.0_ _.1:
- bonded seals (11)
- O-ring (12)
The brakes are set manufacturer-side to the braking torque stip-
ulated on order.
Please check the scope of delivery according to the Parts List as
well as the state of delivery immediately after receiving the
goods.
mayr
®
will take no responsibility for belated complaints.
Please report transport damage immediately to the deliverer.
Please report incomplete delivery and obvious defects immedi-
ately to the manufacturer.
M
Br
0,1 x M
Br
M
L
t
11
t
1
t
2
t
4
U
M
t
t
U
N
