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Application Examples
NOTICE
All equipment must be suitable for the selected safety
category (PL or SIL).
NOTICE
Use of a 1-channel E-stop switch provides no input
redundancy, and no ability for the safety option to
monitor the input short circuits. 1-channel E-stop
switches used with the safety option are suitable only
for Category 2 applications. For information see EN ISO
13849-1.
When using a 1-channel E-stop, implement protective
measures against failure modes that can result in an
unsafe condition. An example of an unsafe condition could
be the failure of the contact. Use a switch with positive
opening operation to reduce the possibility of a failure of
the switch to open.
A short circuit error results in the loss of switching
function. This error can occur from a short circuit across
8
8
the switch contacts, a short circuit across the wires
between the switch and the safety option, or a short
circuit to a secondary source of power. To reduce these
risks, physically separate the wires from each other, and
from other sources of power.
32
Safety Option MCB 152
Example of multiple frequency converters in a daisy
chain
E-Stop
Illustration 8.6 Example of Multiple Frequency Converters in a
Daisy Chain
NOTICE
Up to 3 frequency converters can be connected in a
daisy chain. Total cable length must not exceed 30 m.
Danfoss A/S © 10/2014 All rights reserved.
MCB 15x
FC
12
1
10
12
37
3
11
20
FC
12
37
20
FC
12
37
20
MG37F102
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