Installation and operational instructions for
ROBA
®
-servostop
®
Type 8980.00_00
Sizes 50 - 160
(B.8980.EN)
06/10/2022 GF
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: +49 8341 804-0, Fax: +49 8341 804-421
Page 9 of 26
your reliable partner
4
Product Description
4.1
Scope of Delivery / State of Delivery
The brakes are manufacturer-assembled ready
for installation.
Please observe the Type tag.
Please check the scope of delivery as well as the
state of delivery immediately after receiving the
goods.
mayr
®
power transmission will take no
responsibility for belated complaints. Please
report transport damage immediately to the
supplier. Please report incomplete delivery and
obvious defects immediately to the manufacturer.
The hub (6) is included loose in delivery.
4.2
Function
4.2.1
Quiescent Current Principle
The function principle applied here accords with the
application of the energy-separation principle in
accordance with EN ISO 13849-
2 Appendix A.2 “List of
basic safety principles”. The reliable condition is achieved
through separation of the energy source, and thus
accords with the required safety aspects, for example
during power failure or EMERGENCY STOP.
ROBA
®
-servostop
®
brakes are spring applied,
electromagnetic safety brakes.
Spring applied function (brake):
In de-energized condition, thrust springs (3) press against
the armature disk (2). The rotor (4) is held between the
armature disk (2) and the flange plate (5) via frictional
locking.
The brake is released electromagnetically.
Electromagnetic function (release):
Due to the magnetic force of the coil in the coil carrier (1),
the armature disk (2) is attracted against the spring
pressure to the coil carrier (1).
The brake is released and the rotor (4) can rotate freely.
Safety brake function:
The ROBA
®
-servostop
®
applies the brakes reliably and
safely in the event of a power switch-off, a power failure,
or an emergency stop.
