A Actual frequency
2 Motor standstill
1 Activation of STO
Illustration 7: Safe Torque Off
3.5.4 Safe Stop 1 - SS1
The safety function Safe Stop 1 monitors the deceleration to 0 speed in a controlled manner and activates Safe Torque Off after
detection of stop. The Safe Stop 1 can either be configured as SS1 Delay or SS1 Ramp.
Features of the safety function
• The safety function Safe Stop 1 corresponds to a category 1 stop (controlled braking) in accordance with EN IEC 60204-1.
• Monitoring the speed deceleration after which the energy supply to the motor is safely interrupted.
• The motor becomes torque-free and removes hazardous movements.
3.5.4.1 SS1 Delay
Select the SS1 Delay to activate the Safe Stop 1 function while a parameterized safety delay timer expires. STO is activated immediately
when the configured stop delay has expired, regardless of speed, see 6.3 Parameter List for parameter settings.
By using SS1 Delay, the drive attempts to follow the selected ramp. After a specified delay time, STO is activated and the motor is made
torque free.
NOTICE
Using SS1 Delay may result in the motor still spinning when the Safe Torque Off is activated. The risk analysis for the machine
must indicate that this behavior can be tolerated. An interlock may be required.
Functions and Systems Overview
Installation Guide | VLT® Safety Option MCB 150/151
AQ279747441421en-000101 / 130R0292
22 | Danfoss A/S © 2018.09
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