Installation Of External Safety Device In Combination With Mcb - Danfoss VLT AutomationDrive FC 300 Design Manual

Introduction
NOTE
The requirements of Cat. 3/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/PL "d" (ISO 13849-1). If external forces act on the motor
e.g. in case of vertical axis (suspended loads) - and an
unwanted movement, for example caused by gravity, could
cause a hazard, the motor must not be operated without
additional measures for fall protection. E.g. mechanical
brakes must be installed additionally.
In order to resume operation after activation of Safe Stop,
first 24 V DC voltage must be reapplied to terminal 37
(text Safe Stop activated is still displayed), second a Reset
signal must be created (via bus, Digital I/O, or [Reset] key
on inverter).
By default the Safe Stop functions is set to an Unintended
Restart Prevention behaviour. This means, in order to
terminate Safe Stop and resume normal operation, first the
24 V DC must be reapplied to Terminal 37. Subsequently, a
reset signal must be given (via Bus, Digital I/O, or [Reset]
key).
The Safe Stop function can be set to an Automatic Restart
behaviour by setting the value of 5-19 Terminal 37 Safe
Stop from default value [1] to value [3]. If a MCB 112
Option is connected to the frequency converter, then
Automatic Restart Behaviour is set by values [7] and [8].
Automatic Restart means that Safe Stop is terminated, and
normal operation is resumed, as soon as the 24 V 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 (24 V) only if both the signal from MCB 112 output
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VLT AutomationDrive FC 300 Design Guide, 0.25-75 kW
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 Illustration 3.46.
Illustration 3.46 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] PTC
1 Alarm to [9] PTC 1 & Relay W/A) become possible for
5-19 Terminal 37 Safe Stop. Selections [1]* Safe Stop Alarm
and [3] Safe Stop Warning are still available but are not to
be used as those are for installations without MCB 112 or
any external safety devices. If [1]* Safe Stop Alarm or [3]
Safe Stop Warning 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
frequency converter safely, without Automatic Restart.
Selections [4] PTC 1 Alarm and [5] PTC 1 Warning 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
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-
Hazardous Non Hazardous Area
Area
PTC Thermistor Card
MCB112
X44/ 1 2 3 4 5 6
Digital Input
PTC
e.g. Par 5-15
Sensor
12 13 18 19
Par. 5- 19
Terminal 37 Safe Stop
Safety Device
Safe AND Input
Manual Restart
7 8 9 10 11 12
27 29 32 33 20 37
DI DI
Safe Stop
SIL 2
Safe Output
57
3 3