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
prototype test 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.
6.4.7 Installing intrinsically safe circuits
There must be potential equalization along the entire length of the intrinsically safe electrical
circuits when intrinsically safe circuits are involved.
A stranded wire is used as the potential equalizing cable. A copper braided strip is used to
ensure potential equalization between the cable entry plate and the terminal box enclosure.
Table 6-3 Electrical data
Non-intrinsically safe electric circuit V
m
= 700 V alternating voltage
Intrinsically safe power circuit in "fail-safe" type of protection
Ex ib IIB/IIC, only connected to certified intrinsically safe circuits that are galvan‐
ically isolated from ground.
Maximum values for total:
IIB IIC
e.g. with T4: V
i
= 28 V V
i
= 24 V
I
i
= 300 mA I
i
= 170 mA
P
i
= 1.3 W P
i
= 1.3 W
The effective internal inductance and capacitance are negligibly small.
The intrinsically safe circuits are safely galvanically isolated from all non-intrinsically safe
circuits up to a peak value for the rated voltage of 1000 V. Please refer to the additional plate
on the machine for the maximum values for "intrinsically safe power circuits".
Electrical connection
6.4 Connecting the auxiliary circuits
SIMOTICS HV C 1NB1402-2AA84-4CA0-Z
Operating Instructions 06/2018 67
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