Installation and Operational Instructions
for ROBA-stop
®
-silenzio
®
Type 896.213.30
Sizes 500 – 1800
Chr. Mayr GmbH + Co. KG Tel.: +49 8341 804-0 E079 10 228 000 471
Eichenstraße 1 Fax: +49 8341 804-421 Page 14 of 17
D-87665 Mauerstetten www.mayr.com
Germany E-Mail: info@mayr.com 21/06/2012 TK/HW/GF/SU
Electrical Connection and Wiring
The brake must be operated with
overexcitation.
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). The brake must only be operated with overexcitation
(e.g. with a ROBA
®
-switch or -multiswitch fast acting rectifier or
phase demodulator). 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 directives and
standards (e.g. DIN EN 60204-1 and DIN VDE 0580). Their
observance must be guaranteed and double-checked!
Earthing Connection
The brake is designed for Protection Class I. This protection
covers not only the basic insulation, but also the connection of all
conductive parts to the PE conductor on the fixed installation. If
the basic insulation fails, no contact voltage will remain. Please
carry out a standardized inspection of the PE 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 Behaviour
The operational behaviour 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 disk and the coil carrier (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 coil, which attracts the armature disk to the coil carrier
and releases the brake.
Field Build-up with Normal Excitation
If the magnetic coil is energised with nominal voltage, the coil
voltage does not immediately reach its nominal value. The coil
inductivity causes the current to increase slowly as an
exponential function. Accordingly, the build-up of the magnetic
field takes place more slowly and the drop in braking torque
(curve 1) is also delayed.
Field Build-up with Overexcitation
A quicker and safer drop in braking torque is achieved if the coil
is temporarily placed under a higher voltage than the nominal
voltage, as the current then increases more quickly. Once the
brake is released, it needs to be switched over to the nominal
voltage (curve 2). The ROBA
®
-(multi)switch fast acting rectifier
and phase demodulator work on this principle.
Current path Braking torque path
Magnetic Field Removal
AC-side Switching
The power circuit is
interrupted before 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
coil and 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 brake 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 leads to a rapid
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); however, louder switching noises.
Protective Circuit
When using DC-side switching, the coil must be protected by a
suitable protective 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 protective circuits (e.g. mayr
®
-spark
quenching unit, half-wave and bridge rectifiers), although this
may of course then alter the switching times.
F1: External fuse
Coil
S1
F1
L
N
1 2
3
4
5 6
7
8
1 2
3
4
5
6 7 8
20/017.000.2
200 - 500V~
200 - 300V~
:R
IN
OUT
U– = 0,45×U~
+
–
S
DC
ROBA -switch
I = 1,8Amax –
0,05-2sec
0 -10MΩ Ω
t:
R
R
F1: External fuse
Coil
S1
F1
L
N
1 2
3
4
5 6
7
8
1 2
3
4
5
6 7 8
20/017.000.2
200 - 500V~
200 - 300V~
:R
IN
OUT
U– = 0,45×U~
+
–
S
DC
ROBA -switch
I = 1,8Amax –
0,05-2sec
0 -10MΩ Ω
t:
R
R
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