Danfoss VLT AutomationDrive FC 300 Design Manual page 58

Introduction
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Illustration 3.42 STO Example
Illustration 3.43 SS1 Example
Illustration 3.44 STO Category 4 Example
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VLT
FC
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12
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37
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FC
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18
37
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FC
K1
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37
K1
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K1
MG33BE02 - VLT
®
AutomationDrive FC 300 Design Guide, 0.25-75 kW
FC
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37
FC
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37
FC
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Illustration 3.45 Paralleling of Multiple Frequency Converters
Example
1 Safety relay
2 Emergency stop button
3 Reset button
4 24 V DC
Table 3.22 Legend to Illustration 3.42 to Illustration 3.45
WARNING
Safe Stop activation (i.e. removal of 24 V DC voltage
supply to terminal 37) does not provide electrical safety.
The Safe Stop function itself is therefore not sufficient to
implement the Emergency-Off function as defined by EN
60204-1. Emergency-Off requires measures of electrical
isolation, e.g. by switching off mains via an additional
contactor.
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 typically shorter than 10ms
for the complete performance range of FC 302.
The frequency converter is guaranteed not to restart
creation of a rotational field by an internal fault (in
accordance with Cat. 3 PL d acc. EN ISO 13849-1 and SIL 2
acc. EN 62061). After activation of Safe Stop, the 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.
®
is a registered Danfoss trademark
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