Default value in parameter 42-40 Type is [0] Delay. If this value is selected, the Safe Stop 1 function activates a braking ramp defined
from a selected time delay in parameter 42-42 Delay Time. This means that the braking ramp is linear. Select the value of parameter
42-43 Delta T (the % of the delay time), which is a reasonable tolerance after the SS1 Delay Time has expired.
NOTICE
The SS1 Delay function does not monitor the stopping of the drive. The safety relevant time, Delta T, allows the drive to come
to a stop before Safe Torque Off is activated. Thus ensuring that the system is also stopped before Safe Torque Off is activated.
If a fault occurs, the drive does not come to a stop. It coasts after the time delay no matter of the speed of the drive.
A Actual frequency
2 Activation of STO
4 Parameter 42-43 Delta T
1 Activation of the SS1 Delay Timer
3 Parameter 42-42 Delay Time
Illustration 8: SS1 Delay
When Safe Stop 1 function is active, the drive brings the motor to 0 speed. The Safe Torque Off function is triggered after a specified
safety-relevant time. This safety function corresponds to a controlled stop of the drive according to EN IEC 60204-1, stop category 1.
3.5.4.1.1 Selecting the SS1 Settings
Procedure
1. Enter parameter 42-41 Ramp Profile.
Select:
[0] Linear, if the ramp must follow a linear curve.
[2] S-ramp Const Time, if the ramp should follow an S-ramp.
Functions and Systems Overview
Installation Guide | VLT® Safety Option MCB 150/151
AQ279747441421en-000101 / 130R0292 | 23
Danfoss A/S © 2018.09
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