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Rexroth IndraDyn A
Danger of corrosion
Emergency stop
Other environmental influences
Brake control
Malfunctions
Functional test
DOK-MOTOR*-MAD/MAF****-PR03-EN-P
Corrosion of the motor housing due to aggressive substances (such as
certain coolants, lubricants, cutting oils or salt mists) is to be prevented.
Energies stored in the drive device must be discharged or isolated as
quickly as possible when the emergency-stop device is pressed so that
the risk that the danger zone is affected during a malfunction is reduced
(ATEX guideline 94/9/EG, Appendix II, section 1.6.2)
There are for example the following options:
• discharge of the energies via an intermediate circuit short-circuit
• disconnect the power to the cables and motors before the transition to
the area subject to explosions in order to isolate the energies from the
area subject to explosions.
Heed the following regarding dangers caused by other disturbances:
• Operation only inside the specified ambient conditions,
• Maximum vibration and impact loads
• Protect the ground conductor connection from dirt, corrosion, humidity
and/or aggressive substances, ...
• ...
Internal Motor Brake (optional)
In normal operation, use the brake located within the motor only when at
a standstill and when performing the drive-internal brake check. In these
cases, only low temperatures (<100° C) occur and no sparks are
generated because critical grinding of the brake linings does not occur.
The brake's control mechanism must ensure this function in normal
operation. Under the least favorable installation conditions for the
power supply cables to the brake and under the least favorable load
condition for the power supply, a supply voltage of 24 V +/- 10%
must be supplied to the motor. If a voltage divergence occurs due to a
failure during operation, this failure must be identified and corrected
immediately. The failure can be identified, for example, using a monitoring
device for undervoltage.
Only during a malfunction, i.e. in the case of a fault in the system, may
the brake be activated when the motor is turning to, for example, prevent
dangerous dropping of vertical axes. In this case, sparks may be
generated in the brake and increased temperatures may occur within the
motor. When a malfunction occurs, the operator must eliminate it
immediately.
Before commissioning and in operation in periodic intervals (e.g. every 8
hours), the functioning of the brake is to be checked with an appropriate
braking test. By applying a defined amount of motor torque, the brake is
tested for slippage. For certain drive control devices, it is possible to carry
out an integrated brake test using the Brake Monitor command. Further
information can be found in the respective firmware operation manual for
the drive control device.
Motors for Hazardous Areas
13-5
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