Functional safety technology
Page 77
Product Manual „Servo drives ARS 2320, ARS 2340, ARS 2320W, ARS 2360W“
Version 8.0
Mode of operation:
The request to stop the drive will set the controller enabling to low.
The drive will approach 0 speed using the set deceleration ramp (parameterisable via Metronix
ServoCommander™). After the ramp time (including drop-out delay time of holding brake, if available)
has run out, the triggering of the driver supply relay and the controller enabling will be cancelled by the
superordinate control.
A superordinate control monitors the “safety door open”, “output stage driver supply output” and the
“driver supply feedback” signals and checks them for plausibility. In the case of an error the power
contactor will be shut down.
The opening of the safety door will also interrupt the output stage enabling and the triggering of the
driver supply relay. The servo drive is in “Safe Torque-Off (STO)” mode and protected against restart.
The safety door switching device has been approved as per EN ISO 13849-1, Category 3
Performance Level d.
The DC bus voltage remains present and can be used by the drive immediately after the safety door
has been closed.
If the safety door is opened without a request for a standstill, the motor coasts down as per
EN 60204-1 stop category 0 and at the same time the holding brake of the motor will be applied, if
available. The drive is in “Safe Torque-Off (STO)” mode and protected against restart.
It is also possible to use a door position switch, which keeps the safety door closed until the drive has
come to a complete standstill or the “feedback driver supply” signal indicates the safe mode and the
plausibility check have been successfully completed. However, the “Safe Torque-Off” mode offering
protection against restarting is only activated with the opening of the safety door (nor shown).
Another possible application is the use of a safety door switching device with delayed contacts. The
opening of the safety door has a direct impact on the controller enabling, whose falling edge causes a
controlled stopping at a set deceleration ramp. The signals “output stage enabling” and output stage
driver supply” are then switched off with a delay via the safety module. The drop-out delay time must
be matched to the deceleration ramp time (not shown).
DANGER!
The brake of the motor has to be designed such that it can stop the movement of the
drive.
Summary of Contents for ARS 2320
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