Danfoss FC 300 Design Manual page 56

3 Introduction to AutomationDrive FC 300
3.12.2 Installation of External Safety Device in Combination with MCB112
If the Ex-certified thermistor module MCB112, which uses Terminal 37 as its safety-related switch-off channel, is connected, then the output X44/12 of
MCB112 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 MCB112 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 EN 954-1, Safety Category 3. The connection from the output of the safety device with safe AND logic to Safe Stop terminal 37 must be short-
circuit protected. See figure below:
3
Illustration 3.10: Illustration of the essential aspects for installing a combination of a Safe Stop application and a MCB112 application. The
diagram shows a Restart input for the external Safety Device. This means that in this installation par. 5-19
set to value [7] or [8].
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.
NB!
Note that selection [7] and [8] opens up for Automatic restart when the external safety device is de-activated again.
This is only allowed in the following cases:
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, the following paragraphs of standards
under the EU Machinery Directive must be observed: 5.2.1, 5.2.2, and 5.2.3. of EN954-1:1996 (or ISO 13849-1:2006), 4.11.3 and 4.11.4 of
EN292-2 (ISO 12100-2:2003).
See section Application Examples for further information.
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MG.33.BC.02 - VLT ® is a registered Danfoss trademark
FC 300 Design Guide
Terminal 37 Safe Stop might be