Danfoss VLT CDS302 Operating Instructions Manual page 12

Safety Instructions and Gen...
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Illustration 2.7 Paralleling of Multiple Drives Example
1 Frequency converter
2 24 V DC
3 [Reset] key
4 Safety relay
5 Emergency stop
Table 2.8
WARNING
Safe Stop activation (that is 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, for example, 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 (that is, after the
response time), the frequency converter coasts
(stops creating a rotational field in the motor).
The response time is typically less than 10 ms.
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Operating Instructions VLT
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®
MG34M302 - VLT is a registered Danfoss trademark/Commercial Compressor
®
CDS302 and CDS303
The frequency converter is guaranteed not to restart
creation of a rotational field by an internal fault (in
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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 display shows 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".
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NOTE
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). If external forces act
on the motor, it must not operate without additional
measures for fall protection. External forces can arise for
example, in the event of vertical axis (suspended loads)
where an unwanted movement, for example caused by
gravity, could cause a hazard. Fall protection measures can
be additional mechanical brakes.
By default the Safe Stop function is set to an Unintended
Restart Prevention behaviour. Therefore, to resume
operation after activation of Safe Stop,
1. reapply 24 V DC voltage to terminal 37 (text Safe
Stop activated is still displayed)
2. create a reset signal (via bus, Digital I/O, or
[Reset] key.
The Safe Stop function can be set to an Automatic Restart
behaviour. Set the value of 5-19 Terminal 37 Safe Stop from
default value [1] to value [3].
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.
WARNING
Automatic Restart Behaviour is permitted 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, paragraph 5.3.2.5 of ISO
12100-2 2003 must be observed