11-10 Control Circuits for the Mains Connection Rexroth IndraDrive
DOK-INDRV*-SYSTEM*****-PR02-EN-P
Designing the DC Bus Short Circuit
To design the DC bus short circuit there are the HLB01.1 components
available.
Calculating the resulting braking distance when using the DC bus short
circuit requires, apart from the Rexroth components, knowledge of the
following application parameters:
• velocities
• friction conditions
• ...
With these data the resulting braking distance can be approximately
determined. For the calculation formulas see Appendix.
Note: It is not recommended to short-circuit the motor connections
with the drive controller connected.
Use the HLB01 components with integrated device for DC bus
short circuit.
Without DC Bus Short Circuit
• If unbraked coasting to stop of the drives does not damage the
installation.
• If only asynchronous motors are connected to the supply unit.
• If the end positions of the feed axes have been sufficiently cushioned.
• If external braking devices are used.
The DC bus voltage is not short-circuited.
In the case of E-Stop or when the monitors of the supply unit trigger (e.g.
mains failure), the drives are shut down according to the error reaction set
in the drive controller.
When the E-Stop circuit opens, the mains contactor in the supply unit
drops out immediately. The E-Stop relay or an auxiliary contact of the
mains contactor switches off the drive enable signals. The drives are shut
down according to the error reaction set in the drive controller.
CAUTION
Damage to machines caused by unbraked
coasting to stop of the drives in case their
electronic system is disturbed!
⇒
Use motors with mechanical brake (a holding brake
mustn't be used as service brake).
⇒
Sufficiently cushion end positions of feed axes.
Application
Features
Operating Principle
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