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Automatic Restart means that Safe Stop is terminated, and
normal operation is resumed, as soon as the 24V DC are
applied to Terminal 37, no Reset signal is required.
WARNING
Automatic Restart Behaviour is only allowed in one of the
two situations:
1.
The Unintended Restart Prevention is
implemented by other parts of the Safe Stop
installation.
2.
A presence in the dangerous zone can be
physically excluded when Safe Stop is not
activated. In particular, paragraph 5.3.2.5 of ISO
12100-2 2003 must be observed
3.12.2 Installation of External Safety Device
in Combination with MCB 112
If the Ex-certified thermistor module MCB 112, which uses
Terminal 37 as its safety-related switch-off channel, is
connected, then the output X44/12 of MCB 112 must be
AND-ed with the safety-related sensor (such as emergency
stop button, safety-guard switch, etc.) that activates Safe
Stop. This means that the output to Safe Stop terminal 37
is HIGH (24V) only if both the signal from MCB 112 output
X44/12 and the signal from the safety-related sensor are
HIGH. If at least one of the two signals is LOW, then the
output to Terminal 37 must be LOW, too. The safety device
with this AND logic itself must conform to IEC 61508, SIL 2.
The connection from the output of the safety device with
safe AND logic to Safe Stop terminal 37 must be short-
circuit protected. See
13
0B
A9
6
7.
11
12
11
10
9
8
7
6
5
4
3
2
1
37
20
33
32
29
27
19
18
13
12
DI
DI
SIL 2
Safe Stop
Digital Input
e.g. Par 5-15
PTC
Sensor
X44/
Par. 5-19
Terminal 37 Safe Stop
Safety Device
S
af
e
In
pu
t
Safe Output
Safe AND Input
Manual Restart
PTC Thermistor Card
MCB112
Non
-
Hazardous Area
Hazardous
Area
Illustration 3.22 Illustration of the essential aspects for installing
a combination of a Safe Stop application and a MCB 112
application. The diagram shows a Restart input for the external
Safety Device. This means that in this installation
5-19 Terminal
37 Safe Stop
might be set to value [7] or [8]. Refer to MCB 112
operating instuctions, MG.33.VX.YY for further details.
Parameter settings for external safety device in
combination with MCB112
If MCB 112 is connected, then additional selections ([4] –
[9]) become possible for par. 5-19 (Terminal 37 Safe Stop).
Selection [1]* and [3] are still available but are not to be
used as those are for installations without MCB 112 or any
external safety devices. If [1]* or [3] should be chosen by
mistake and MCB 112 is triggered, then the frequency
converter will react with an alarm ”Dangerous Failure
[A72]” and coast the drive safely, without Automatic
Restart. Selections [4] and [5] are not to be selected when
an external safety device is used. Those selections are for
when only MCB 112 uses the Safe Stop. If selections [4] or
[5] are chosen by mistake and the external safety device
triggers Safe Stop then the frequency converter will react
with an alarm ”Dangerous Failure [A72]” and coast the
drive safely, without Automatic Restart.
Selections [6] – [9] must be chosen for the combination of
external safety device and MCB 112.
Introduction to FC 300
FC 300 Design Guide
56
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
3
3
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