Stop switch
SQS
SLS 1
X4-11 (DIN1A)
X4-12 (DIN1B)
X7-1
X3-9 (+24V)
X4-13 (DIN2A)
X4-14 (DIN2B)
Advanced safety
option board
Encoder input
connections
X7-8
X3-1 (STO 1)
X3-2 (STO 2)
STO
option board
OPTAF
STO
X3-3 (GND)
X3-4 (GND)
SD2+
SD1+
SD2-
SD1-
Light curtain
Common ground
X3-10 (GND)
e30bi382.10
Illustration 80: Light Curtain Control of the SLS Function
N O T I C E
The powering of the light curtain is not considered in this example. The light curtain must be powered by an adequate power
source.
N O T I C E
This example uses light curtain, but similar configurations can also be done with other devices.
13.6 SLS without a Direct Support of the Drive Application
If there is no suitable drive application that supports the automatic speed limiting during SLS safety function, the limited speed can
also be executed based on the external frequency reference that is supplied to the drive. When the SLS function is requested from
the drive, the speed reference is simultaneously used to ramp the speed down and kept below the limit of the SLS safety function.
If different systems are used to request safety functions and supply the frequency reference, the digital output of the Advanced
safety option board can be used to inform the frequency reference handling system about the SLS request.
In case the speed limit monitored by the SLS safety function is violated, the SQS safety function will be executed. If SQS is used in
other modes than SQS-STO, a ramping to standstill is expected to be executed. Without a drive application that executes the ramp-
ing, external system must use the speed reference to ramp the speed to zero or a stop command must be sent to the drive to exe-
cute a stop ramp. An output of the Advanced safety option can be used to supply an indication of a violation a safety function.
AQ319736045637en-000101 / DPD01798180 | Danfoss A/S © 2021.06
Configuration Examples
VACON® NXP Advanced Safety Options
Operating Guide
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