Electrical Connections - ABB TTF300 Manual

TTF300 FIELD-MOUNT TEMPERATURE TRANSMITTER | CI/TTF300-EN REV. H
Maintenance
Check the cable glands during each maintenance session. If the
cable is slack, retighten the cap(s) of the cable glands.
If it is not possible to retighten them, the cable gland will need
to be replaced.
M20 × 1.5 plastic cable gland for various types of protection
The optionally supplied M20 × 1.5 plastic cable gland has a
limited temperature range. The permissible ambient
temperature range of the cable gland is −20 to 80 °C
(−4 to 176 °F). When using the cable gland, make sure that the
ambient temperature is within this range.
The cable gland must be installed in the housing with a
tightening torque of 3.8 Nm. On the cable side, when installing
the connection of the cable gland and cable, check for integrity
to ensure that the required IP rating is met.

Electrical connections

Grounding
If, for functional reasons, the intrinsically safe circuit needs to be
grounded by means of a connection to the potential
equalization, it may only be grounded at one point.
Intrinsic safety installation check
If transmitters are operated in an intrinsically safe circuit, proof
that the interconnection is intrinsically safe must be provided in
accordance with IEC/EN 60079-14 as well as IEC/EN 60079-25.
The supply isolators / DCS inputs must feature intrinsically safe
input protection circuits in order to eliminate hazards (spark
formation).
In order to provide proof of intrinsic safety, the electrical limit
value must be used as the basis for the EC-type examination
certificates for the equipment (devices); this includes the
capacitance and inductance values of the cables.
Proof of intrinsic safety is said to have been provided if the
following conditions are fulfilled when a comparison is carried
out in relation to the limit values of the equipment:
Transmitter
(intrinsically safe equipment)
L + L (cable) ≤ L
i c
C + C (cable) ≤ C
i c
Field (Ex area)
A Transmitter
Figure 3: Intrinsic safety proof
Installation in a potentially explosive atmosphere
Transmitters can be installed in all kinds of industrial sectors.
Potentially explosive systems are divided into zones,
meaning that a wide range of different instruments are also
required. For this, pay attention to the country-specific
guidelines and certificates!
Note
Ex relevant specifications must be taken from the EC-type
examination certificates and other relevant certificates that
apply in each case.
With transmitters for PROFIBUS PA and FOUNDATION
Fieldbus H1 applications, FISCO interconnection methods can be
used.
Supply isolator / DCS input
(related equipment)
U ≥ U
i o
I ≥ I
i o
P ≥ P
i o
o
o
Control room (safe area)
B Supply isolator / DCS input with
supply / segment coupler
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