Start-Up Acknowledgment; Reset Of A Safety Function - Danfoss Vacon OPTEA Operating Manual

VACON® NXP Advanced Safety Options
Operating Guide
Acknowledgment and Reset can be assigned to the same digital input of the Advanced safety option board. Consider the behav-
ior of the safety functions and the safety system carefully, if you decide to do that.

6.1.5.2 Start-up Acknowledgment

In addition to acknowledging safety functions, the acknowledgment signal can also be used to permit the Advanced safety option
board to release STO(+SBC) after start-up. This acknowledgment signal can be automatic or manual.
If automatic acknowledgment is used, STO(+SBC) is released after the Advanced safety option board has done the start-up and es-
tablished communication to the drive control board and over safe fieldbus (when used). If manual start-up acknowledgment is
used, the STO(+SBC) is kept active until the acknowledgment signal is received.

6.1.6 Reset of a Safety Function

Violations of safety functions or faults of the Advanced safety option board cause the STO(+SBC) function to be activated. Use a
reset signal to deactivate the STO(+SBC) function, reset faults and return the system to normal operation. For the Advanced safety
option board, the reset signal is always an explicit signal from another system.
If the SQS-SS2 function is used, a violation of a safe monitoring function can activate the SOS function. You can reset the SOS
function in the same way as the STO function.
The reset signal has three allowed sources:
• A safe digital input
• A safe fieldbus
• A not safe control board of the AC drive
The sources of the reset signal are equal. A reset signal from any of them is permitted to reset violations of safety functions and
faults in the Advanced safety option board.
The reset signal from the control board of the drive is sent when a fault reset command (drive input, fieldbus, drive application, or
drive control panel) is sent to the drive. If a safe reset signal is required, disable the reset signal from the control board of the AC
drive in parameterization.
Different conditions apply for resetting the violations of safety functions and the faults of the Advanced safety option board.
To reset violations of safety functions or faults of the Advanced safety option board, these conditions apply:
• STO(+SBC) or SOS is active (SOS in case of SQS-SS2)
• The speed is below the monitoring limit of all requested safety functions
In digital inputs, the reset signal is edge sensitive. The reset is done with inactive -> active transition (logical level). A reset over a
safe fieldbus depends on the selected fieldbus. See
buses.
After a violation or a fault, the reset signal behaves as an implicit acknowledgment signal for safety functions for which acknowl-
edgment conditions apply when a reset signal is sent.
Danfoss A/S © 2021.06
N O T I C E
N O T I C E
7.1.1 Introduction to PROFIsafe
N O T I C E
for information on the differences of the field-
AQ319736045637en-000101 / DPD01798 | 63
Safety Functions