Installation and operational instructions for
ROBA
®
-servostop
®
Type 8982.00_01
Size 40
– 100
(B.8982.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 3 of 27
your reliable partner
Please read these Operational Instructions carefully and follow them accordingly!
Ignoring these Instructions may lead to malfunctions or to brake failure, resulting in damage to other parts. These Opera-
tional Instructions are part of the brake delivery.
Please keep them handy and near to the brake at all times.
1
General Guidelines
1.1
Definition of Terms
Term
Meaning
ROBA
®
-servostop
Electromagnetically-actuated safety brakes as a component for holding and de-
celeration of moved machine parts.
Nominal braking torque M
N
The theoretical nominal braking torque assigned to the designation. The braking
torque lies within the stated braking torque tolerances.
The braking torque tolerance is stated in % of the braking torque Standard.
Load torque
Holding torque which is required to hold a vertical axis (load) suspended, refer-
ring to the brake.
Release (separate)
Release designates the procedure through which the magnetic coil is energised,
the rotor is released in the brake, and therefore no braking torque is applied.
Close (connect)
Closing or armature disk drop-out designates the process through which the
magnetic coil is de-energised, the voltage is switched off, the rotor in the brake is
clamped and the braking torque is applied.
Overexcitation
Overexcitation designates when the brake requires a higher supply voltage (=
overexcitation voltage) than the coil nominal voltage to release for a short period
of time (overexcitation time). Here a ratio of 2:1 or 3:1 is usual.
Overexcitation time
The overexcitation voltage must only be available for a short time for release of
the brake.
Response delay on connection t
11
(close)
The time from power switch-off to the start of the braking torque increase (10 %
of the stated braking torque).
Connection time t
1
(drop-out time)
The time from power switch-off to achieving 90 % of the stated braking torque.
Separation time t
2
(attraction time)
(release)
The time from power switch-on to achieving 10 % of the stated braking torque. At
this point, the brake is almost free.
