Danfoss VLT AutomationDrive FC 300 Design Manual page 48

3. Introduction to FC 300
It is designed and approved suitable for the requirements of Safety Category 3 in EN 954-1. This functionality is called Safe Stop. Prior to integration and
use of Safe Stop in an installation, a thorough risk analysis on the installation must be carried out in order to determine whether the Safe Stop functionality
and safety category are appropriate and sufficient.
Activation and Termination of Safe Stop
The Safe Stop function is activated by switching off the 24Vdcv supply to the Terminal 37. By default the Safe Stop functions is set to an Unintended
Restart Prevention behaviour. This means, in order to terminate Safe Stop and resume normal operation, first the 24Vdc must be reapplied to Terminal
37. Subsequently, a reset signal must be given (via Bus, Digital I/O, or [Reset] key).
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The Safe Stop function can be set to an Automatic Restart behaviour by setting the value of parameter 5-19 from default value [1] to value [3]. If a
MCB112 Option is connected to the drive, then Automatic Restart Behaviour is set by values [7] and [8].
Automatic Restart means that Safe Stop is terminated, and normal operation is resumed, as soon as the 24Vdc are reapplied to Terminal 37, no Reset
signal is required.
IMPORTANT! Automatic Restart Behaviour is only allowed in one of the two situations:
1. The Unintended Restart Prevention is implemented by other parts of the Safe Stop installation.
2. A presence in the dangerous zone can be physically excluded when Safe Stop is not activated. In particular, the following paragraphs of standards
under the EU Machinery Directive must be observed: 5.2.1, 5.2.2, and 5.2.3. of EN954-1:1996 (or ISO 13849-1:2006), 4.11.3 and 4.11.4 of
EN292-2 (ISO 12100-2:2003).
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MG.33.BA.02 - VLT ® is a registered Danfoss trademark
FC 300 Design Guide