The Sls Signals - Danfoss Vacon OPTEA Operating Manual

VACON® NXP Advanced Safety Options
Operating Guide
When the speed limit is changed, the monitoring behavior depends on whether the speed value of the new speed limit is higher or
lower than that of the current speed limit. When changing to a speed limit with a higher speed value, the monitoring of the new
limit starts immediately, and the monitoring for the old speed limit ends.
When changing to a speed limit with a lower speed value, the monitoring of the old speed limit stays active for the time that is set
with SLS t1. After the set time, the monitoring of the old speed limit ends and the monitoring of the new speed limit starts.
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.
When two digital inputs are used to select the speed limit, parameter SLS td3 is used. SLS td3 determines the transition time that is
permitted for the two inputs to reach the selected value. The first change from the executed selection value (SLS 1 Limit, SLS 2 Limit,
SLS 3 Limit, or No SLS requested) starts the timer of the parameter SLS td3. After the time set with SLS td3, the inputs are examined
and based on the results, a new speed limit is selected.
If the change in the input state was caused by an accident and the request signals return to the currently executed selection, the
monitoring of that limit is not interrupted.
Table 35: Selecting the SLS Limit with 1 Digital Input
SLS Input 1
0
1
Table 36: Selecting the SLS Limit with 2 Digital Inputs
SLS Input
1 2
0 0
0 1
1 0
1 1
When you request the SLS function over a safe fieldbus, see

6.3.2.5 The SLS Signals

It is possible that the Active and Reached signals that are mentioned in this chapter are not always available in all interfaces.
The availability of the signals over safe fieldbus depends on the used fieldbus protocol. Refer to chapter Safe fieldbuses for more
information.
Table 37: The SLS Signals
Signal Activation and deactivation of the signal
Activation:
SLS 1 Active
SLS 2 Active • SLS is requested and starts to execute.
SLS 3 Active
Deactivation (manual acknowledgment):
92 | Danfoss A/S © 2021.06
N O T I C E
N O T I C E
SLS LIMIT
SLS 1 Limit
No SLS limit requested
SLS LIMIT
SLS 1 Limit
SLS 2 Limit
SLS 3 Limit
No SLS limit requested
7.1.1 Introduction to
N O T I C E
PROFIsafe.
AQ319736045637en-000101 / DPD01798
Safety Functions
Description
The signal indi-
cates if SLS func-
tion is being exe-
cuted.