Danfoss VLT AutomationDrive Design Manual page 56

Introduction to FC 300
FC
12
18
37
Illustration 3.19 SS1 example
FC
12
37
K1
Illustration 3.20 STO category 4 example
1 Safety relay
2 Emergency stop button
3 Reset button
FC
3
4
12
1
20
37
FC 2
20
37
FC
20
37
Illustration 3.21 Paralleling of multiple drives example
1 Safety relay
2 Emergency stop button
3 Reset button
4 24V DC
FC 300 Design Guide
3
1
2
3
K1
1
K1
2
®
MG.33.BD.02 - VLT is a registered Danfoss trademark
WARNING
Safe Stop activation (i.e. removal of 24V 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
24V 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 of EN 954-1, 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.
NOTE
The requirements of Cat. 3 (EN 954-1)/PL "d" (ISO 13849-1)
are only fulfilled while 24V 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). If external forces
act on the motor e.g. in case of vertical axis (suspended
loads) - and an unwanted movement, for example caused
by gravity, could cause a hazard, the motor must not be
operated without additional measures for fall protection.
E.g. mechanical brakes must be installed additionally.
In order to resume operation after activation of Safe Stop,
first 24V 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
24V DC 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 5-19 Terminal 37 Safe
Stop from default value [1] to value [3]. If a MCB 112
Option is connected to the drive, then Automatic Restart
Behaviour is set by values [7] and [8].
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