Siemens SIMOTICS FD 1MM1 Series, Operating And Installation Instructions

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6.6.3 Intrinsically safe circuits for sensors or probes
Observe Standard IEC / EN 60079‑14 when selecting and routing connecting cables.
NOTICE
Intrinsically safe circuits for sensors or probes
If blue connection terminals are installed for sensors, you must connect them to certified
intrinsically safe circuits. This can otherwise result in damage.
Ensure that you also observe the additional requirements laid down in IEC / EN 60079-14 for
intrinsically safe equipment and the associated connecting cables.
NOTICE
Connecting the temperature sensors
Temperature sensors may be connected only to intrinsically safe circuits with certified
evaluation devices. The maximum permissible input currents and powers according to the EU
type-examination certificate may not be exceeded. This can otherwise result in damage.
If shielded, intrinsically safe temperature sensors are fitted or mounted, they must be
connected using the blue connecting terminals. The cable shield is grounded just once;
multiple grounding is not permitted.
6.6.4 Connect metal shield in the terminal box
If you are using metal-armored cables that are inserted into the terminal or auxiliary terminal
boxes with non-intrinsically safe circuits, then ground the metal shield in the terminal box.
Additional grounding points are permissible.
● In terminal boxes with internal grounding part, connect the metal shield to the internal
grounding point.
● In terminal boxes without internal grounding part, connect the metal shield to one of the
green-yellow grounding terminals.
6.6.5 Connecting temperature monitoring for the stator winding
The stator winding is monitored for thermal loading by temperature sensors embedded in the
stator winding.
Electrical connection
6.6 Connecting the auxiliary circuits
SIMOTICS FD 1MM1
92
Operating Instructions 02/2019