Paralleling Of Multiple Drives Example - Danfoss VLT CDS 303 Operating Instructions Manual

Safety Instructions and Gen...
2 2
1
1
1
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 Off activation (that is removal of 24 V DC
voltage supply to terminal 37) does not provide electrical
safety. The Safe Torque Off 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.
12
®
VLT
2
12
20
37
5
20
37
20
37
Danfoss A/S © Rev. 2013-07-03 All rights reserved.
Compressor Drives CDS 302/CDS 303
1. Activate the Safe Torque Off function by
removing the 24 V DC voltage supply to the
3
terminal 37.
2. After activation of Safe Torque Off (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.
The frequency converter is guaranteed not to restart
4
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
Torque Off, the display shows the text "Safe Stop
activated". The associated help text says, "Safe Stop has
been activated. This means that the Safe Torque Off has
been activated, or that normal operation has not been
resumed yet after Safe Torque Off activation".
NOTICE!
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 Torque Off function is set to an
Unintended Restart Prevention behaviour. Therefore, to
resume operation after activation of Safe Torque Off,
1. reapply 24 V DC voltage to terminal 37 (text Safe
Torque Off activated is still displayed)
2. create a reset signal (via bus, Digital I/O, or
[Reset] key.
The Safe Torque Off 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 Off is
terminated, and normal operation is resumed, as soon as
the 24 V DC are applied to Terminal 37. No Reset signal is
required.
MG34M422