6.3.2.3 Ramp Monitoring
SLS x Limit
SLS t1
SLS td1
t
Speed
SLS td2
e30bi397.10
Illustration 51: The SLS Function in the Ramp Monitoring Mode
When ramp monitoring is used, time monitoring is also used. The ramp monitoring monitors that the initial speed change after the
function is requested obeys the set deceleration ramp. Select the monitored ramp with parameter SLS Ramp Monitoring. It is possi-
ble to monitor the minimum ramp, the maximum ramp, or both these ramps.
The ramp monitoring starts after the time that is set in SLS td1 elapses. The time delay of SLS td1 starts when the SLS function
becomes active. The ramp monitoring ends when the SLS function is reached. If the speed does not obey the parameterized ramp
during the monitoring, the SQS function becomes active as a violation response. The ramp monitoring does not continue below the
requested speed limit.
N O T I C E
The ramp monitoring is not executed when the speed limit changes. The monitoring for the previous speed limit stays active
during the change.
N O T I C E
After a new SLS request, if a speed limit change occurs before the initial speed limit is reached, the new request is handled as a
new initial request. The timers of the parameters SLS t1 and SLS td2 restart, and ramp monitoring is executed, if it was used.
6.3.2.4 The Speed Limit Selection of the SLS Function
The SLS function has 3 different speed limits: SLS 1 Limit, SLS 2 Limit, and SLS 3 Limit. When a speed limit is requested from both a
digital input and via fieldbus, the monitored speed limit is selected by the priority of the speed limits. The priority of the speed limits
is independent of the actual value of the speed limits.
The priority of the speed limits (from the highest to the lowest)
1. SLS 1 Limit
2. SLS 2 Limit
3. SLS 3 Limit
4. No SLS requested
N O T I C E
It is possible to parameterize a higher priority speed limit to allow higher speed than a lower priority speed limit, but it is not
recommended.
AQ319736045637en-000101 / DPD01798 | 91Danfoss A/S © 2021.06
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VACON® NXP Advanced Safety Options
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