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Installation and Operational Instructions for
ROBA®-brake-checker plus DC Type 028.100.2 (B.0281002.EN)
28/06/2019 HH/GF/GC
Page 6 of 12
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: info@mayr.com your reliable partner
Switch-ON
Brake switch-on occurs with a connected supply voltage
(control and power terminal) by closing of start (Input) on the
signal side using the voltage 24 VDC (auxiliary power sup-
ply for bridging) or a 24 VDC control signal applied there. A
green light-emitting diode emits a signal when the device is
switched on. After the changeover from overexcitation volt-
age to holding voltage, the diode continues to illuminate at
reduced brightness.
Switch-OFF
Device Fuses
Installation of a device protection fuse into the mains fuse of
the ROBA®-brake-checker monitoring module.
Short-circuits or earth short-circuits can lead to ROBA®-
brake-checker monitoring module failures. After fuse
elements have reacted to a malfunction, the ROBA®-brake-
checker monitoring module must be checked for functional
and operational safety (overexcitation voltage, switch-off
voltage, response delay time, holding voltage). The same
procedure is to be carried out after coil failure.
If the brakes are operated in power reduction mode, then ad-
ditional times must be observed in order to ensure reduction
of the current.
If short switching times are required,
please switch DC-side (bridge be-
tween control terminal 2 and 4) Here,
the ROBA®-brake-checker monitoring
module limits the switch-off voltage to
approx. 60V. DC-side disconnection is
signalized by the red light-emitting di-
ode flashing at the moment of switch-off.
If a longer brake engagement time or
a quieter switching noise is required,
please switch to freewheeling operation
(manufacturer-side setting).
Holding voltage UH
The holding voltage can be adjusted via the DIP switch. The
switches may only be switched in de-energised state and
may only be adjusted as depicted.
The set holding voltage value UHshould equal 3 times the
drop-out voltage of the safety brake .
Adjustments DIP switch
The 8 positions DIP switch mounted onto the device is split
up into several different functional areas:
DIP switch Holding voltage UH [VDC]
24 48
4 8
6 12
8 16
12 24
16 32
no power reduction
Manufacturer-side setting
Release monitoring
Voltage reduction mecha-
nism
Overexcitation time
Holding voltage
Design 24 VDC
Minimum recommended reduction times prior to switch-off
[ms]
Reducedvoltage [VDC] 16 12 8 6 4
Current range
< 5 A 100 120 140 150 160
> 5 A 200 250 300 350 400
Design 48 VDC
Minimum recommended reduction times prior to switch-off
[ms]
Reducedvoltage [VDC] 32 24 16 12 8
Current range
< 5 A 150 170 200 250 300
> 5 A 300 340 400 500 600
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.
For the calculation, a simplified Parts-Count procedure has
been used (EN ISO 13849-1)
Reliability Nominal Values
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