Auxiliary Circuits; Selecting Cables; Connecting The Auxiliary Circuits; Intrinsically Safe Circuits For Sensors Or Probes - Siemens SIMOTICS M-1PH8 Operating Instructions & Installation Instructions

6.4

Auxiliary circuits

6.4.1

Selecting cables

Take the following criteria into account when selecting the connecting cables for the auxiliary
circuits:
● Rated current
● Rated voltage
● System-dependent conditions, such as ambient temperature, routing type, cable cross-
● Requirements to IEC / EN 60204‑1
● Requirements to IEC / EN 60079‑14
6.4.2

Connecting the auxiliary circuits

Cable entry and routing
The cable entries and sealing plugs must be certified for use in Zone 22.
A plate is bolted to the terminal box housing via a rectangular cut-out through which the
connecting cables are introduced. Refer to the machine documentation for the dimensions.
● Normally this plate is supplied without threaded holes for the cable glands. Adjust the
● Seal the screwed sockets on the cable glands in accordance with the degree of protection
6.4.3

Intrinsically safe circuits for sensors or probes

Observe the IEC / EN 60079‑14 standard when selecting and routing connecting cables.
CAUTION
Intrinsically safe circuits for sensors or probes
If blue connection terminals are installed for sensors/probes, these sensors/probes must be
connected to certified intrinsically safe circuits. This can otherwise result in damage. Ensure
that you also observe the additional requirements in IEC / EN 60079‑14 for intrinsically safe
equipment and the associated connecting cables.
SIMOTICS M-1PH8
Operating Instructions 05/2012 A5E03986435A AA
section as defined by required length of cable, etc.
number and size of the cable glands to the operational conditions.
for the machine (see rating plate).
Electrical connection
6.4 Auxiliary circuits
65