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6.1.5 Acknowledgment of a Safety Function
6.1.5.1 Acknowledgment of a Safety Function
The acknowledgment signal is used to deactivate a safety function that has been set to require a manual acknowledgment after the
safety function request has ended. The acknowledgment mode can be set as automatic or manual.
In the automatic mode, the acknowledgment is tied to the deactivation of the safety function request. In the manual mode, a sepa-
rate acknowledgment signal from a digital input, the drive control board, or a fieldbus is necessary.
The selection between automatic and manual acknowledgment is made with a parameter and separately for each function. It is
possible to use functions with different acknowledgment settings at the same time.
A function can be acknowledged when these conditions apply:
There is no request signal.
When executed as a violation response, the SQS safety function may not be acknowledged separately. It is acknowledged as a part
of the safety function reset. See 6.1.6 Reset of a Safety Function.
If a function is set to have automatic acknowledgment, the function is deactivated when its request is deactivated.
N O T I C E
A higher priority safe stopping function can interrupt a lower priority safe stopping function before it is reached.
The manual acknowledgment 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 acknowledgment signal are equal. A manual acknowledgment signal from any of them is permitted to stop a
safety function.
The acknowledgment 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. You can disable the acknowledgment signal from the control board during
parameterization.
N O T I C E
When a safety function is requested by both a digital input and a fieldbus, both of them must deactivate the request before the
function can be acknowledged. When the last request is deactivated, the automatic acknowledgment signal becomes active, and
the manual acknowledgment signal becomes acceptable.
AQ319736045637en-000101 / DPD01798 | 59Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide
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