9-6 Control Mains Contactor Rexroth IndraDrive
DOK-INDRV*-HMV-*******-PR01-EN-P
9.3 Control via NC Controller
If the mains contactor is controlled via NC controller, it is possible to
provide a position controlled shutdown of the drive via the NC controller in
the event of an emergency stop or as reaction of the internal monitoring of
the drive.
This kind of mains contactor control is mostly used with drives which are
electronically coupled and shutdown synchronously when a power failure
occurs.
The DC bus voltage is not short-circuited so that power for a position-
controlled shutdown of the drives is available.
Note: The energy stored in the DC bus or the regenerated energy
must be greater than the energy needed to excite
asynchronous machines or for the return motion.
The parameter "Activating NC reactions with a fault" must be
programmed in the drive controller (P-0-0117, bit 0 = 1).
Given an emergency stop or the actuation of the supply unit monitor (e.g.,
power failure), the drives are shutdown position-controlled by the position
controller.
Upon initiating the emergency stop sequence, or with the actuation of the
monitor in the supply unit (e.g., power failure), the mains contactor in the
supply unit falls off.
Drives with SERCOS interface signal the error to the NC control, meaning
that the drives can be shutdown position controlled.
Drives without SERCOS interface require the control to evaluate the UD
contact. If the UD contact is actuated, then the NC control must shut
down the drives.
CAUTION
Machine damages due to brakeless slowing
down of the drives in case of too little DC bus
voltage!
⇒ The controller should evaluate the UD contact and
shut down the drives, when the contact reacts.
Application
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