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Bosch Rexroth AG
Explosion protection for MSK motors
Cable type ready-made RKL...
4324, 4329
4330, 4344, 4349
Ambient temperature
Connecting conditions
Connectors
Grounding
Corrosion
Emergency stop
Other environmental factors
Tab. 4-2:
Tensile load for ready-made Rexroth power cables
The maximum operating temperature is 155 °C on the motor housing at an
ambient temperature of 0 ... 40 °C. The ignition temperatures of materials
that come into contact with the motors must be much higher than T=155 °C.
The motors must only be operated with Rexroth IndraDrive drive control devi‐
ces. Drive control devices of other manufacturers are not allowed.
Ignition sparks can occur, when motor connectors are disconnected or con‐
nected under load.
WARNING
●
Connect and disconnect connectors only when they are dry and de-
energized.
●
During operation of the system, all connectors must be securely tight‐
ened or locked.
The motors must be grounded via a motor cable and via a second separate
ground conductor with minimum 4 mm² cross section. Check that the position
of the grounded conductor is fixed before commissioning.
If the grounding connector in the motor cable and the second separate
grounding conductor on the motor housing are not connected or are interrup‐
ted due to corrosion or other defects during their lifetime, the discharge cur‐
rent flows (as leakage current) over conducting housing parts. This has to be
prevented with the above-mentioned measures. (ATEX directive 94/9/EC, ap‐
pendix II, chapters 1.2.3 and 1.3.3, 1.4)
Corrosion of the motor housing by aggressive materials (such as certain cool‐
ants, lubricants, cutting oils or salt mists) must be prevented.
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.
(ATEX directive 94/9/EC, appendix II, chapter 1.6.2)
The following options exist for the activation of the emergency stop device:
●
Reduce the energy via an intermediate short circuit.
●
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.
Fan
Operation of MSK motors according to the ATEX Directive 94/9/EG is only al‐
lowed without a fan.
Heed the application notes
notes" on page 115
●
Operation only within the specified ambient conditions
●
Maximum vibration and impact loads
●
Protection of protective conductor connections against dirt, corrosion,
moisture and/or aggressive materials, etc.
●
...
DOK-MOTOR*-MSK*EXGIIK3-PR09-EN-P
Synchronous Servomotors MSK For Potentially Explosive Areas
Raw cable INK... F
0605 (10.0 mm²) 116
0606 (16.0 mm²) 132.5
Damage to persons or property by discon‐
necting or connecting energized connectors!
chapter 10 "Operating conditions and application
regarding risks due to outer influences, like:
[N]
Z max
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