Control Circuit "Position-Controlled Deceleration by the Control Unit" without DC Bus Short
Circuit (ZKS)
If the mains contactor is controlled by the control unit, the drive, in the case of
emergency stop or when the drive-internal monitor triggers, can be deceler‐
ated in a position-controlled way by a control unit.
Application
This kind of mains contactor control is mainly used for electronically coupled
drives that are decelerated synchronously even in the case of mains failure.
Features
The DC bus voltage is not short-circuited so that there is energy available for
position-controlled deceleration of the drives.
The energy stored in the DC bus or the regenerated energy has
to be greater than the energy required for excitation of asynchro‐
nous machines or for return motions.
The parameter "Activation of NC reaction on error" has to be set accordingly
in the drive controller (P-0-0117, bit 0 = 1).
In the case of emergency stop or when the monitors of the supply unit trigger
(e.g. mains failure), the drives are decelerated in a position-controlled way by
the positioning control.
Operating Principle
When the emergency stop circuit opens or the monitors of the supply unit
trigger (e.g. mains failure), the mains contactor in the supply unit drops out.
For drives with sercos interface, the error is signaled to the control unit and
the drives can be decelerated in a position-controlled way.
For drives without sercos interface, the control unit has to evaluate the UD
contact. When the UD contact triggers, the control unit must decelerate the
drives.
Damage to machines caused by unbraked
coasting to stop of the drives in case DC bus
voltage is too low!
NOTICE
The control unit should evaluate the UD contact and decelerate the drives
when the contact triggers.
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
Bosch Rexroth AG
167/309
Circuits for the Mains Connection
