Table of Contents
9-2
Control Mains Contactor
Applications
Features
Function
You should use this mode, if
• only motors with permanent magnetic excitation have been mounted,
• or if motors with permanent magnetic excitation and asynchronous
motors (induction machines) have been mounted,
• or if the E-Stop circuit must be duplicated or if e.g. a protection door
monitor is required,
• or if your drive system includes an extended and substantial E-Stop
circuit.
Note:
As the energizing current of the auxiliary relay for triggering the
mains contactor flows via the E-Stop circuit, the voltage drop
must not become too great. To ensure a reliable energizing,
the total resistance of the E-Stop circuit which comes into
effect between the connections X3/1 and X3/9 must be under
45 Ω!
The DC bus dynamic brake
magnetic excitation even with a fault in the drive electronics. In order to
trigger the DC bus dynamic brake in such a case, the Bb contacts of the
drive controllers in the E-Stop circuit have to be connected in series with
the CNC contact. The DC bus dynamic brake is only active in the event of
drive errors. If the emergency stop is actuated, asynchronous drives will
also brake.
When the Bb contacts of the supply unit are connected in series with
the CNC contact in the E-Stop circuit, the DC bus dynamic brake is only
triggered in the case of a supply unit error.
In an emergency stop situation or with actuation of the monitor in the
supply unit (e.g., power failure), the drives are shutdown by the drive
electronics in the manner set for the specific error reaction.
Property damages due to uncontrolled axis
movements!
The DC bus dynamic brake protects machines against
drive errors. It alone cannot assume the function of
WARNING
protecting personnel. Given faults in the drive and supply
unit, uncontrolled drive movements are still possible even
if the DC bus dynamic brake is activated.
Asynchronous machines do not brake if the DC bus is
short-circuited. Depending on the type of machine, injury
to personnel is possible.
⇒ Additional monitoring and protective devices should
be installed in the installation.
When actuating the emergency stop key, the mains contactor in the
supply unit immediately falls off. Drive enables are shut off by the
emergency stop relay or an auxiliary contact of the mains contactor. The
drives are shutdown as per the error reaction set in the drive controller.
A drive error message from the supply module (Bb1-contact), an error
message by the NC control (servo error) or the overtravelling of the end
limit switch causes the mains contactor to be switched off and the DC bus
dynamic brake to be actuated.
Rexroth IndraDrive
can shutdown motors with permanent
DOK-INDRV*-HMV-*******-PR01-EN-P
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