Profibus Wiring Procedure; Grounding; Protective Grounding; Integrated Lightning Protection (Optional) - ABB 2600T Series Operating Instructions Manual

6. Plug and seal the electrical ports. Make sure that when
the installation has been completed, the electrical ports
are properly sealed against entry of rain and/or corrosive
vapours and gases.
7. If applicable, install wiring with a drip loop. Arrange the
drip loop so the bottom is lower than the conduit
connections and the transmitter housing.
8. Put back the housing cover, turn it to seat O-ring into the
housing and then continue to hand tighten until the cover
contacts the housing metal-to-metal. In Ex-d (Explosion
Proof) installation, lock the cover rotation by turning the
set nut (use the 2mm Allen key supplied with the
instrument).

7.2.3 PROFIBUS wiring procedure

Special Fieldbus Connectors are also available as optional item
for the easy connection of the transmitter to the bus. Below
there are the pictures of the two selected models with different
plugs.
Figure 35: Connectors (respectively 7/8" and M12x1)
Important. The M12x1 PLUG model is considered the default
version for the 266 PdP – PROFIBUS PA version. The connector
thread will be in accordance with the selected housing model. By
default the housing thread is 1/2 – 14 NPT.
The picture below shows the pin-out of the two different
Profibus connector models.
— The Bus lines are polarity independent.
— The GROUND and SHIELD connections must be
evaluated depending by the installation rules
If necessary the ground terminal could be also connected. For
details about the installation and connections refers to specific
documents in the Profibus website www.Profibus.com and in
the ABB website www.abb.com.
Figure 36: PROFIBUS terminal block scheme
Internal ground termination
point
Bus lines
(polarity independent)
External ground termination
point
1 3
7/8" connector
2 4
Mating female plug
NOT SUPPLIED
2
1
3
M12x1 connector
4
PIN (male) identification
1
PA +
2
GROUND
3
PA –
4
SHIELD

7.2.4 Grounding

A terminal is available on both the outside of the housing and in
the plug for grounding (PE) the transmitter. Both terminals are
electrically connected to one another.

7.2.5 Protective grounding

All transmitters are supplied with an external ground
connection for protective grounding. Wire this ground
connection to a suitable earth ground. For a transmitter
measuring loop an earth ground should maintain a resistance
of 5 ohms or less. Use a heavy duty conductor, at least 15
AWG / 1,6 mm2 Ø.
Warning. A protective grounding connection is absolutely
necessary to insure personnel protection, to protect against surge
(in case of installation of this option) and to prevent explosions in
potentially explosive environment.

7.2.6 Integrated lightning protection (optional)

The transmitter housing must be connected using the
grounding terminal (PA), by means of a short connection with
the equipotential bonding. Equipotential bonding (minimum
diameter: 4 mm (AWG 12) is required throughout the cable
2
routing area. In the case of transmitters with integrated
lightning protection (optional), the intrinsically safe circuit is
connected to the equipotential bonding for safety reasons.
Important. Test voltage withstand capability can no longer be
ensured when this protective circuit is used.
2600T Series Pressure transmitters | OI/266/PB-EN Rev. E 31
7 Device introduction