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 11 of 17
Electrical Connection and Wiring
DC current is necessary for operation of the brake. The coil
voltage is indicated on the Type tag as well as on the brake body
and is designed according to the DIN IEC 60038 (± 10 %
tolerance). Operation must take place via DC voltage with a low
ripple content, e.g. via a bridge rectifier or with another suitable
DC supply. The connection possibilities can vary dependent on
the brake equipment. Please follow the exact connections
according to the Wiring Diagram. The manufacturer and the user
must observe the applicable regulations and standards (e.g. DIN
EN 60204-1 and DIN VDE 0580). Their observance must be
guaranteed and double-checked.
Supply Voltage Requirements
In order to minimise noise development of the
released brake, it must only be operated via DC
voltage with low ripple content. AC current
operation can take place using a bridge rectifier
or another suitable DC power supply. Supplies
whose output voltages have a high ripple content (e.g. a half-
wave rectifier, a switch-mode mains adaptor, ...) are not
suitable for operation of the brake.
Grounding Connection
The brake is designed for Protection Class I. This protection
covers therefore not only the basic insulation, but also the
connection of all conductive parts to the protective conductor
(PE) on the fixed installation. If the basic insulation fails, no
contact voltage will remain. Please carry out a standardized
inspection of the protective conductor connections to all
contactable metal parts!
Device Fuses
To protect against damage from short circuits, please add
suitable device fuses to the mains cable.
Switching Behavior
The reliable operational behavior of a brake is to a large extent
dependent on the switching mode used. Furthermore, the
switching times are influenced by the temperature and the air
gap between the armature disks (4.1 or 4.2) and the coil carriers
(2 or 3) (dependent on the wear condition of the linings).
Magnetic Field Build-up
When the voltage is switched on, a magnetic field is built up in
the brake coils, which attracts the armature disks (4.1 and 4.2) to
the coil carriers (2 and 3) and releases the brake.
Brake release can only be guaranteed
if both coil carriers (2 and 3)
are energized.
Magnetic Field Removal
AC-side switching
The power circuit is
interrupted in front of the
rectifier. The magnetic field
slowly reduces. This delays
the rise in braking torque.
When switching times are not
important, please switch AC-
side, as no protective
measures are necessary for
the coil and the switching
contacts.
AC-side switching means
low-noise switching
; however, the
brake engagement time is longer (approx. 6-10 times longer than
with DC-side switching), use for non-critical braking times.
DC-side Switching
The power circuit is
interrupted between the
rectifier and the coil as well as
mains-side. The magnetic
field reduces extremely
quickly. This causes a quick
rise in braking torque.
When switching DC-side, high
voltage peaks are produced in
the coil, which lead to wear on
the contacts from sparks and
to destruction of the
insulation.
DC-side switching means
short brake engagement times (e.g.
for EMERGENCY STOP operation)
; however, louder switching
noises.
Protection Circuit
When using DC-side switching, the coil must be protected by a
suitable protection circuit according to VDE 0580, which is
integrated in
mayr
®
-rectifiers. To protect the switching contact
from consumption when using DC-side switching, additional
protective measures are necessary (e.g. series connection of
switching contacts). The switching contacts used should have a
minimum contact opening of 3 mm and should be suitable for
inductive load switching. Please make sure on selection that the
rated voltage and the rated operating current are sufficient.
Depending on the application, the switching contact can also be
protected by other protection circuits (e.g.
mayr
®
-spark
quenching unit, half-wave and bridge rectifiers), although this
may of course then alter the switching times.
Bridge rectifier
Coil
F1: external fuse
Bridge rectifier
Coil
F1: external fuse
max.
max.
