Installation and Operational Instructions for
ROBA-stop
®
-stage Type 8070. _ _ _ _ _
Sizes 8
– 200
(E102 03 000 000 4 EN)
18/11/2022 HW/GC
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten, Germany
Phone: +49 8341 804-0, Fax: +49 8341 804-421
Page 14 of 17
Hand Release (10) (Emergency Release)
(Option / Figs. 1
–
3)
ROBA-stop
®
–stage brakes are spring applied brakes.
Electrical release of the brakes is not possible on power failure.
However, on power failure, the brake can be released
mechanically using the hand release bracket (10.1), an optional
part of the delivery, as follows:
Insert the open end of the hand release bracket (10.1) up to
its limit between the sleeves projecting out of the cover (11)
on both sides.
Following this, the brake can be emergency-released by
carefully and slowly swinging the hand release bracket,
during which a residual torque of approx. 5 % of the set
braking torque can occur.
When actuating the hand release (10), a
switching signal of the release monitoring
device (9) cannot be guaranteed.
DANGER
If the conveyor system starts to move too
quickly, please swing the hand release
bracket (10.1) back again.
After finishing the procedure,
please remove the hand release bracket
(10.1).
Table 5: Release Angle, Release Force
Size
Release angle
[°]
Release force
[N]
8
approx. 25
(releasing in both
directions is possible)
approx. 40
16
approx. 75
32
approx. 130
64
approx. 140
100
approx. 180
200
approx. 240
Braking Torque
The (nominal) braking torque is the torque effective in the shaft
train on slipping brakes, with a sliding speed of 1 m/s referring to
the mean friction radius.
The brake is loaded statically when used as a service brake and
loaded dynamically in EMERGENCY STOP operation.
Respectively, there are different speed values for the friction
material, which in practice also leads to different friction values
and therefore braking torques.
Amongst other things, the braking torque is dependent on the
respective quality / condition of the friction surfaces
(conditioning). Therefore, bedding in of the brake linings on
newly installed brakes or on rotor replacement when mounted is
required, taking into account the permitted loads: The following
applies as a reference value for the bedding in of new brake
linings. The load in new condition may not be more than 50 % of
the max. friction work, acc. Technical Data. This process is to be
carried out at reduced speed, approx. 30 % of the operating
speed.
If the bedding in should take place under works-specific
conditions, we ask you to contact us, so that we can provide the
appropriate parameters.
Friction materials develop their optimum effect only under speed
at the appropriate contact pressure, as continuous regeneration
of the friction surface then takes place (torque consistency).
Permanent grinding of the rotors can lead to overheating /
damage to the brake linings, and therefore to a drop in braking
torque.
Furthermore, friction materials are subject to aging, which is also
influenced, among other things, by higher temperatures and
other ambient influences. We recommend regular inspection of
the braking torque (1 x per year) including the respective
dynamic braking actions as a refresher.
