Functional safety technology
Page 73
Product Manual „Servo drives ARS 2320, ARS 2340, ARS 2320W, ARS 2360W“
Version 8.0
The following steps show how to get a rotating drive to a “Safe Torque-Off (STO)” state:
1. Before activating the “Safe Torque-Off” (that is driver supply relay “OFF” and output stage
enabling “OFF”; both shut-down paths inhibit the PWM signals) the drive should be stopped by
deactivating the controller enabling. Depending on the application, the brake ramp (t9-t8) can be
set via Metronix ServoCommander™ (“Quick stop deceleration”).
DANGER!
Activation of the “Safe Torque-Off (STO)” function during operation will cause the drive
to run down. If the drive has a holding brake it will be activated. It is therefore very
important to make sure that the motor brake can actually stop the motion of the drive.
2. After 0 speed has been reached, the drive will be controlled to this set value for a parameterisable
drop-out delay time (t10-t9). This parameterisable time is the delay, after which the holding brake
of the motor is applied. This time depends on the holding brake and must be set by the user. For
applications without holding brake this time can be set to 0.
3. After this time has run out, the internal output stage enabling will be switched off by the µP (t10).
The holding brake will definitely be activated as soon as the “brake ramp time + set drop-out delay
time” has run out, even if it the drive has not yet been able to stop!
4. As of t10 the “Safe Torque-Off” can be activated (simultaneous deactivation of triggering of
driver supply relay and output stage enabling). The time (t11-t10) depends on the
application and must be set by the user.
5. With the withdrawal of the trigger signal for the relay that switches off the driver supply
(t11) the capacitors in this voltage branch will be discharged. Approx. 80ms (t12-t11) after
the withdrawal of the trigger signal for the relay that switches off the driver supply, the
feedback contact ([X3], pins 5 and 6) will be closed.
6. At the time t13 the letter “H” will be shown on the 7-segment display of the servo drive for
the visualization of the “Safe Torque-Off (STO)” function. This will happen at least 30ms
after the closing of the floating feedback contact (t13-12).
Содержание ARS 2320
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