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ATEX-certified motor thermal protection function with PTC thermistor relays (+L513+Q971) 23
Wiring
General wiring instructions
1. Wire only the PTC sensor circuit into the potentially explosive atmosphere.
2. The installation of the PTC sensor circuit in the Ex Zone must comply with the
requirements for the applicable type of protection, such as:
•
Ex d (EN/IEC 60079-1),
•
Ex eb (IEC 60079-7:2015; Ex e in EN 60079-7:2007 and IEC 60079-7:2006),
•
Ex ec (IEC 60079-7:2015; Ex nA in EN/IEC 60079-15:2010).
3. Install the drive, including the components of the ATEX-certified motor thermal
protection function, outside the explosive atmosphere.
4. Route the sensor cables away from the motor cable. We recommend shielded sensor
cables to minimize electromagnetic interference from power cables.
5. Ground all sensor cable shields to a single grounding point outside the explosive
atmosphere.
Note: The drive STO function has a redundant architecture, that is, both STO channels
must be used in the safety function implementation. For more information, see the
hardware manual.
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