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MKE Synchronous Servomotors
Application conditions ATEX device group II, category 2
Bosch Rexroth AG
R911402016, Edition 02
are suitable for the operating conditions and
have a separate certificate. Observe the spe-
cial conditions of the components.
4.6
Application conditions
ATEX device group II, cat-
egory 2
4.6.1
Maximum housing tempera-
ture
The maximum housing temperature is 115
°C on
the motor housing at an ambient temperature of
40
°C. The ignition temperatures of substances
coming into contact with the motors must not fall
below 135
°C. Observe external heat and cooling
sources when determining the operation temper-
ature. Project-specific electrical/thermal evalua-
tions must be carried out by the customer if they
deviate from the Bosch Rexroth specification. If
necessary, project-specific metrological verifica-
tions are required that reflect the actual ambient
conditions at the place of use.
4.6.2
Connection conditions
The motors can be operated with Bosch Rexroth
controllers. In the case of using drive controllers
of other manufacturers, the following special con-
ditions must be fulfilled
tion on foreign converters ” on page 54
.
Depending on the drive controller or third-party
converter used, function-tested tripping devices
with the II 2 G or II 2 D designation may be
required to evaluate the temperature sensors.
4.6.3
Grounding
The motors must be grounded via a motor cable
and via a second separate ground conductor with
minimum 4
mm² cross section. Check the proper
installation of the protective and ground con-
ductor connection before startup.
•
Protective conductor motor cable
•
Ground conductor see
“Ground connection” on page 51
The redundant protective conductor installation
ensures a safe drain of occurring discharge cur-
rents even in error case (e.
g.. at interrupted pro-
tective conductor).
4.6.4
Corrision
Prevent motor corrosion which can occur due to
aggressive substances like certain coolants and
lubricants as well as cutting oils or salt mist.
4.6.5
Switch-off
Energies stored in the intermediate circuit have
to be reduced or insulated as soon as possible
through the activation of the emergency stop
device, so that in the case of a failure the risk of
an effect into the danger zone is reduced
directive 2014/34/EU).
For example, this can be achieved as follows:
•
Reduce the energy via an intermediate short
circuit. For information on the DC link short-
circuit function, refer to the documentation
of the control device; when using third-party
inverters, contact the manufacturer.
•
Isolation of the energies before they are
transferred into the potentially explosive
atmosphere by isolating the voltage of the
lines and motors present in the potentially
explosive atmosphere.
4.6.6
Residual risks
The existing residual risks are to be observed by
the user, when the installation is designed.
•
Overstress
–
When the motor is overloaded, including
cases where errors in the mechanical or
electrical equipment of the machine
cause such overloading, high tempera-
tures may occur that result in explosion
hazards.
•
Operation in explosive dust atmosphere.