Installation and Operational Instructions for
ROBA
®
-ES Couplings Type 94_._ _ _._ Sizes 14
– 65
(B.9.6.EN)
11/03/2022 TK/GH/GC/MD
Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten, Germany
Phone: +49 8341 804-0, Fax: +49 8341 804-421
Page 23 of 29
Guidelines and Directives for Operation in
Areas Where There is a Danger of Explosion
Conditions to Observe in
Areas Where
There is a Danger of Explosion
For malfunction-free and wear-minimized coupling operation it is
necessary to keep to the coupling characteristic values (Technical
Data) stated on pages 5 to 14; furthermore, it is necessary that a
suitable coupling dimensioning as described on pages 25 and 26
is carried out.
Large shaft misalignments, in particular with high speeds and an
alternating overall load configuration with high frequency, strain
and heat up the elastomer material.
Unpermittedly high overall load configuration, unpermittedly high
speeds and unpermitted shaft misalignments can destroy the
coupling.
Attention: Danger of ignition
For suitable coupling dimensioning (see ROBA
®
-ES Coupling
Dimensioning, pages 25 and 26), please observe the following
points:
a) Coupling nominal torque
b) Coupling peak torque
c) Max. speed
d) Max. shaft misalignments
e) Ambient temperatures
f) Service factors
CAUTION
Operation outside of the indicated
characteristic data is not permitted. There is a
danger of coupling destruction and of ignition.
The number and type of start-up impacts must be taken into
account according to the calculation basis (pages 25 and 26)
during coupling dimensioning. Furthermore, elastomer heating
may occur due to speed resonance. This must also be taken into
account during coupling dimensioning. Changed operating
parameters in the system require a renewed inspection of the
coupling dimensioning. The maximum given ambient
temperatures are to be kept to. The maximum surface
temperature of the coupling changes in dependence of the
ambient temperature, see coupling marking. Exceeding the
permitted ambient temperature means a danger of elastomer
destruction, or the maximum permitted surface temperature of the
coupling is exceeded. With destroyed or heavily worn elastomer
there is the danger that the metallic claws of the hubs hit each
other.
Attention: Danger of ignition
Electrical potential equalization on the coupling must be possible
via the mounted shaft ends using the motor or gearbox.
All screws must be secured against loosening using a sealing
lacquer, e.g. Loctite 243.
Hub combinations are only permitted in the same material
combination, aluminum/aluminum or steel/steel.
Combinations steel/aluminum are not permitted.
The combination aluminum shrink disk hub and steel shrink disk
does not represent any danger potential.
Despite technical coupling dimensioning, system-dependent
vibration excitations may occur during operation, which might lead
to resonances and therefore to destructions on the ROBA
®
-ES
coupling. On critical applications, the total load profile of the
system must be run through during initial operation in order to
confirm the suitability of the coupling in the system.
Operation in an overcritical speed range and in the resonance
range is not permitted.
Furthermore, coupling malfunctions must be expected if the
Installation Guidelines are not observed. The data stated in these
Installation and Operational Instructions must be observed.
All tightening torques must be observed.
After having reached the specified Maintenance and Inspection
Intervals, the tightening torques must be inspected using a torque
wrench. If the specified torques are not observed, component
movements due to metal contact and therefore warming up and
formation of sparks must be expected.
Constructional modifications of the coupling are not permitted.