Suited Protective Measures; Conductor Material; Power Supply Cable; Cable Glands - ABB TTF200 Operating Instructions Manual

18 TTF200 FIELD-MOUNT TEMPERATURE TRANSMITTER | OI/TTF200-EN REV. B
... 7 Electrical connections
... Protection of the transmitter from
damage caused by highly energetic
electrical interferences

Suited protective measures

The following items should be observed to protect the
transmitter from sensor-side damage:
• In the vicinity of the transmitter, sensor and sensor
connector cable in case of a connected sensor, high-energy
overvoltage, overcurrent and high-frequency interference
signals due to welding operations, lightning, circuit breakers
or large consumers of electricity among others should be
absolutely avoided.
• The connection cable of the sensor on the transmitter should
be disconnected when performing welding work in the
vicinity of the installed transmitter, sensor, as well as supply
lines from the sensor to the transmitter.
• This correspondingly also applies to the supply side, if there
is a connection there.

Conductor material

Power supply cable

Maximum cable outer diameter:
12 mm (0.47 in)
Maximum wire cross section:
2
2.5 mm (AWG 16)

Cable glands

The cable diameter must be appropriate for the cable gland used
so that IP rating IP 66 /IP 67 or NEMA 4X can be maintained. This
must be checked during installation.
For delivery without cable gland (thread M20 × 1.5 or NPT ½ in),
the following points must be observed:
• Use cable glands in accordance with version M20 × 1.5 or
NPT ½ in.
• Observe information in the data sheet for the cable gland
used.
• Check the working temperature for the cable gland used.
• Check the IP rating IP 66 / IP 67 or NEMA 4X of the cable
gland used.
• Check the Ex relevant specifications for the cable gland
used in accordance with the manufacturer data sheet or
the Ex declaration.
• The cable gland used must be approved for the cable
diameter (IP rating).
• Observe tightening torque in accordance with
information in data sheet / operating instructions for the
cable gland used.
Change from two to one column

Shielding of the sensor connection cable

To ensure the system benefits from optimum electromagnetic
interference immunity, the individual system components, and
the connection cables in particular, need to be shielded.
The shield must be connected to the ground reference plane.
Note
National regulations and directives must be observed when
grounding system components.
NOTICE
Damage to components!
In systems without potential equalization or with potential
differences between the individual grounding points, multiple
instances of shield grounding can result in transient currents
at mains frequency.
These can damage the shielding, influence the measurements
and have a significant impact on signal transmission, of bus
signals in particular.