Danfoss VLT Safety Option MCB 150, Operating Instructions Manual, Page: 34 / 76

1
3
12
11
12
37
20
MCB15x
130BC311.11
10
C
B
A
A Actuator
B Switch
C FC 302
Illustration 4.13 Connecting 1 NO/1 NC Sensor, e.g. Magnetic
Switch
1
12
11
12
37
20
MCB15x
130BC312.11
3
24 V DC
A
B
C
0 V
D
A Safety PLC
B Safety output
C GND
D FC 302
Illustration 4.14 Connecting a Digital Output Module, e.g.
Safety PLC
A
10
1
3
12
11
12
37
20
MCB15x
130BC313.11
B
A 1-channel emergency stop switch
B FC 302
Illustration 4.15 Connecting a Sensor, e.g. 1-channel
Emergency Stop Mushroom Pushbutton or Limit Switch
NOTICE
All equipment used must be suitable for the selected
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 for input short circuits. One-channel E-stop
switches used with an safety option are suitable only for
Category 2 applications, per EN ISO 13849-1 PL c or SIL1.
When a 1-channel E-stop is used, guard against failure
modes that can result in an unsafe condition. An example
of an unsafe condition could be the failure of the contact
to a short circuit condition. A switch with positive opening
operation should be used to reduce the possibility of a
failure of the switch to open. A short circuit failure results
in loss of switching function. This failure can occur from a
short across the switch contacts, a short across the wires
connected to the switch between the switch and the
safety option , or a short to a secondary source of power.
To reduce these risks, physically separate the wires from
each other and from other sources of power (e.g., in
separate wire ways or conduit). According to the definition
of European standard EN ISO 13849-1, a 1-channel E-stop
could be used in applications where PL c or less (b or a)
has been determined via a risk-assessment procedure.
130BC960.10
E-Stop
MCB 15 x
1
10
3
12
11
12
37
20
FC
12
37
20
FC
12
37
20
FC
Illustration 4.16 Example of Multiple Frequency Converters in
Daisy Chain
Up to 3 frequency converters may be connected in a daisy
chain. Total cable length must not exceed 30 m.
Installation Operating Instructions
32 Danfoss A/S © Rev. 2014-02-11 All rights reserved. MG34W302
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