Danfoss FC 300 Design Manual page 55

FC 300 Design Guide
Activation and Termination of Safe Stop
The Safe Stop function is activated by removing the voltage at Terminal 37 of the Safe Inverter. By connecting the Safe Inverter to external safety devices
providing a safe relay, an installation for a safe Stop Category 1 can be obtained. The Safe Stop function of AutomationDrive FC 302 can be used for
asynchronous and synchronous motors.
Safe Stop activation (i.e. removal of 24 V DC voltage supply to terminal 37) does not provide electrical safety.
1. Activate the Safe Stop function by removing the 24 V DC voltage supply to the terminal 37.
2. After activation of Safe Stop (i.e. after the response time), the frequency converter coasts (stops creating a rotational field in the motor). The
response time is shorter than 10 ms for the complete performance range of AutomationDrive FC 302. For AutomationDrive FC 302 up to 7.5 kW
it is even shorter than 5 ms.
The frequency converter is guaranteed not to restart creation of a rotational field by an internal fault (in accordance with Cat. 3 of EN 954-1). After
activation of Safe Stop, the AutomationDrive FC 302 display will show the text Safe Stop activated. The associated help text says "Safe Stop has been
activated. This means that the Safe Stop has been activated, or that normal operation has not been resumed yet after Safe Stop activation.
NB!
The requirements of Cat. 3 (EN 954-1) / PL "d" (ISO 13849-1) are only fulfilled while 24 V DC supply to terminal 37 is kept removed
or low by a safety device which itself fulfills Cat. 3 (EN 954-1) / PL "d" (ISO 13849-1).
In order to resume operation after activation of Safe Stop, first 24 V DC voltage must be reapplied to terminal 37 (text Safe Stop activated is still displayed),
second a Reset signal must be created (via bus, Digital I/O, or [Reset] key on inverter).
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).
The Safe Stop function can be set to an Automatic Restart behaviour by setting the value of par. 5-19
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 24 V DC are applied 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).
MG.33.BC.02 - VLT ® is a registered Danfoss trademark
3 Introduction to AutomationDrive FC 300
Terminal 37 Safe Stop
from default value [1] to
3
55