Danfoss VLT Safety Option MCB 150 User Manual

3.5.5.1 SLS without Ramp
The safety function Safely Limited Speed monitors whether a specified velocity value is exceeded since it was activated via DI1 or DI2.
The function is active until the selected input has been put to high again.
If 2 safe-speed limits must be monitored, set 1 of the 2 Safe Digital Inputs DI1 or DI2 in parameter 42-20 Safe Function to SLSa or SLS-b.
Then select the input type in parameter 42-21 Type.
The cut-off speed represents the maximum allowed frequency of the actual motor frequency. If the motor frequency accelerates above
that value, the safety option enters external fault selected (STO or SS1 Ramp), and the error is given. The frequency value at which a
shutdown is realized should be parameterized in parameter 42-50 Cut Off Speed.
Table 6: Parameters for SLS without Ramp
Parameter Unit Range Default
Parameter 42-50 Cut Off Speed RPM 120–10000 RPM 270 RPM
Parameter 42-51 Speed Limit RPM 1–9999 150 RPM
Parameter 42-52 Fail Safe Reaction n/a STO/SS1 STO
t
1
2
4
5
3
6
f
e30bc324.11
A
B
A Actual frequency
1 SLS is activated
3 Parameter 42-50 Cut Off Speed
5 Activation of failure function set in parameter 42-52 Fail Safe
Reaction
B SLS limit
2 Parameter 42-51 Speed Limit
4 Delta speed limit
6 Fixed value of 120 RPM in parameter 42-19 Zero Speed Limit
Illustration 12: SLS without Ramp
Functions and Systems Overview
Installation Guide | VLT® Safety Option MCB 150/151
AQ279747441421en-000101 / 130R0292
28 | Danfoss A/S © 2018.09

Danfoss VLT Safety Option MCB 150 Specifications

General

Brand	Danfoss
Model	VLT Safety Option MCB 150
Category	Control Unit
Language	English