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
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.
Example of multiple frequency converters in a daisy
chain
130BC960.10
E-Stop
MCB 15x
1
10
3
12
11
12
37
20
FC
12
37
20
FC
12
37
20
FC
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.
Application Examples Safety Option MCB 152
32 Danfoss A/S © 10/2014 All rights reserved. MG37F102
88
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