Installation and Operational Instructions for
ROBA
®
-brake-checker plus AC Type 029.700.2
(B.0297002.EN)
your reliable partner
26/06/2019 HH/GF
Page 6 of 10
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten, Germany
Tel.: +49 8341 804-0, Fax: +49 8341 804-421
www.mayr.com
, E-Mail:
66
Interruption of the voltage at control terminal 1 Supply volt-
age +24 VDC: All outputs (signal, error, warning) are re-set:
• Signal (output) is set to 0 VDC (low)
• Error (output) is set to 24 VDC (high)
Reset
Frequency Change (50/60 Hz)
After a frequency change in the input voltage, the switching-
on process (energisation) is not detected, or an error is
indicated.
• Switch on (energise) the brake again
• After this “initialisation switching“, the ROBA
®
-brake-
checker can be operated as normal.
Inching Mode
During inching mode (fast sequence of switching on and
off), no reliable detection is possible.
After the end of inching mode, restart the monitoring
function:
• De-energise the brake
• Switch on (energise) the brake again
Repeated switch-on (energisation) before the brake is closed
generates a fault when the maximum current is reached.
Start process
During each individual start process, all outputs (signal,
error, warning) are reset.
The outputs must be assessed for the plausibility of signal
conditions, signal changes and their correct temporal
sequence.
Functional Guidelines
Switch-ON
Switch-on always takes place AC-side, as only then is the
overexcitation activated.
Switch-OFF
If short switching times are required, please
switch DC-side. The AC-side should always
be switched as well, in order to activate the
overexcitation.
If a longer brake engagement time or a quieter switching
noise is required, please switch AC-side. For this, a bridge
must be installed between terminals 11 and 12.
Operation on Transformers
During operation on a transformer, please ensure sufficient
rigidity on transformers (min. 3x P
N
of the brake).
A filter or external varistor must be installed.
Please ensure that the standard EN 50160 is kept to and
that this is re-checked after installation of the ROBA
®
-
brake-checker.
Overexcitation
On overexcitation, the brake is initially energised with a
voltage higher than the nominal voltage. This decreases the
separation time t
2
.
MTTF
140 years at 60 °C
200 years at 40 °C
Duration of use
20 years
The basis of the MTTF calculation forms (if available) the
information of the component manufacturer supplemented
by the information from the Siemens standard SN 29500.
The simplified Parts Count procedure ISO 13849-1 has been
used for the calculation.
The switching time t
2
of the brake can increase by 20 - 60
ms.
Reliability Nominal Values
Time Delays
Switching Times
Recovery Time
20 ms
Reset
>20 ms
Signal delay
approx. 40 ms
overexcitation
2
×
t
2
+ 200 ms
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