REXROTH IndraDrive C - Control Circuits for Mains Connection of Supply Units Rexroth Indradrive M; Deceleration in the Case of Disturbed Electronic System of Drive; Deceleration in the Case of E-Stop or Mains Failure; Control by E-Stop Relay

Rexroth IndraDrive Control Circuits for the Mains Connection 11-7
DOK-INDRV*-SYSTEM*****-PR02-EN-P
11.3 Control Circuits for Mains Connection of Supply Units
Rexroth IndraDrive M
Deceleration in the Case of Disturbed Electronic System of Drive
As a safety measure in addition to shutdown with deceleration of the
drives in case the electronic system is disturbed, it is possible to short-
circuit the DC bus voltage.
When the DC bus voltage is short-circuited, motors with permanent
magnet excitation are always shut down with deceleration. In this case it
is irrelevant whether the electronic system of the drive is still functioning
or not.
Note: Asynchronous drives do not decelerate when the DC bus
voltage has been short-circuited!
If the electronic system is disturbed and the DC bus voltage is not short-
circuited, motors with permanent magnet excitation coast in an
uncontrolled way.
Deceleration in the Case of E-Stop or Mains Failure
In the case of E-Stop or mains failures, the drives normally are shutdown
by drive control.
In the case of E-Stop or when the drive-internal monitors trigger, the drive
control inputs the command value "zero". The drives are thereby
decelerating in a controlled way with maximum torque.
In some applications (e.g. electronically coupled gear cutting machines) it
is required that the drive shutdown is controlled by the control unit in the
case of E-Stop or mains failures, In the case of E-Stop or when the drive-
internal monitors trigger, the control unit decelerates the drives in a
position-controlled way.
For further details see the Functional Description of the firmware under
the index entry "best possible deceleration".
Control by E-Stop Relay
With DC Bus Short Circuit
If you control the mains contactor in the supply unit by an E-Stop relay
and short-circuit the DC bus, you achieve a high degree of safety with little
effort. The monitoring functions of the drive system are used in the most
effective way.
You should use this variant when
• only motors with permanent magnet excitation are connected.
• motors with permanent magnet excitation and asynchronous motors
(induction machines) are connected.
• the E-Stop switch has to be duplicated or a safety door monitor, for
example, is required.
• your drive system has an extensive emergency stop circuit.
Application