Sls With Ramp - Danfoss VLT Safety Option MCB 150 Installation Manual

Installation Guide | VLT® Safety Option MCB 150/151
If speed exceeds the limit, parameter 42-52 Fail Safe Reaction is activated. The safety function can either be STO or SS1 Ramp Time. SS1
can only be triggered as error response if a Safe Stop 1 function has been set as Safe Stop 1 with ramp time function, set in parameter
42-40 Type.
Safe jog withSLS
f
3
A
6
1
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
Illustration 13: Safe Jog
Access under specific conditions of reduced risk
Under specific conditions of reduced risk, safe jog allows access to areas for fault-finding, commissioning, and more. On machines
where safe jog (jogging or inching) is required, this is also possible from 0 speed setpoint. By activating SLS, the motor can be moved at
safe jog resulting in several cycles and with safely monitored movements. The motor can be started and stopped continuously also
from 0 speed.

3.5.5.2 SLS with Ramp

If this safety function is needed, configure the safety option for Safely Limited Speed (SLS). When the inputs DI1 or DI2 are selected as
SLS, input is OFF, feedback velocity is monitored and compared against a configurable safe speed limit.
Select parameter 42-53 Start Ramp to configure an SLS Monitoring Ramp. The ramping begins when SLS monitoring is requested by the
selected input for SLS transition from ON to OFF. The safety option starts monitoring for safe limited speed when the ramp-down times
out. If the system speed exceeds or is equal to the configured safe speed limit during Safely Limited Speed monitoring, a Safely Limited
Speed fault occurs. The safety option then initiates the configured Safe Stop type selected in parameter -52 Fail Safe Reaction.
The ramping begins at the absolute value of the actual speed. If the actual speed is already below the Safely Limited Speed limit, the
limit comes into effect immediately without ramping. When the Safely Limited Speed function is deactivated, the speed limits are
ramped up back to the values defined in parameter group 3-1* References. The actual speed then returns to the reference value if it was
limited by this function.
Danfoss A/S © 2018.09
5 4
B
2
t
Functions and Systems Overview
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
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