Danfoss VLT CDS 303 User Manual

130BC975.10
12
37
1
20
1
1
3
4
5
2
37
20
37
20
Figure 2.7 Paralleling of Multiple Drives Example
1 Frequency converter
2 24 V DC
3 [Reset] key
4 Safety relay
5 Emergency stop
Table 2.6 Legend to Figure 2.7
WARNING
Safe Torque O activation (that is removal of 24 V DC
voltage supply to terminal 37) does not provide electrical
safety. The Safe Torque O function itself is therefore not
sucient to implement the Emergency-O function as
dened by EN 60204-1. Emergency-O requires measures
of electrical isolation, for example, by switching o
mains via an additional contactor.
1. Activate the Safe Torque O function by
removing the 24 V DC voltage supply to the
terminal 37.
2. After activation of Safe Torque O (that is, after
the response time), the frequency converter
coasts (stops creating a rotational eld in the
motor). The response time is typically less than 10
ms.
The frequency converter is guaranteed not to restart
creation of a rotational eld 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
Torque O, the display shows the text ”Safe Stop
activated”. The associated help text says, "Safe Stop has
been activated. This means that the Safe Torque O has
been activated, or that normal operation has not been
resumed yet after Safe Torque O activation”.
NOTICE!
The requirements of Cat. 3 (EN 954-1)/PL “d” (ISO
13849-1) are only fullled while 24 V DC supply to
terminal 37 is kept removed or low by a safety device
which itself fullls 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 Torque O function is set to an
Unintended Restart Prevention behaviour. Therefore, to
resume operation after activation of Safe Torque O,
1. reapply 24 V DC voltage to terminal 37 (text Safe
Torque O activated is still displayed)
2. create a reset signal (via bus, Digital I/O, or
[Reset] key.
The Safe Torque O function can be set to an Automatic
Restart behaviour. Set the value of parameter 5-19 Terminal
37 Safe Stop from default value [1] to value [3].
Automatic Restart means that Safe Torque O is
terminated, and normal operation is resumed, as soon as
the 24 V DC are applied to Terminal 37. No Reset signal is
required.
Safety Instructions and Gen...
VLT
®
Compressor Drives CDS 302/CDS 303
12 Danfoss A/S © Rev. 2013-07-03 All rights reserved. MG34M422
22

Danfoss VLT CDS 303 Specifications

General

Brand	Danfoss
Model	VLT CDS 303
Category	DC Drives
Language	English