ABB 266FF Operating Instructions Manual - page 30
30 OI/266/FF-EN Rev. B
| 2600T Series Pressure transmitters
7 Transmitter wiring
7. Transmitter wiring
Warning - General risk.
Observe the applicable regulations
governing electrical installation. Connections must only be
established in a dead-voltage state. Since the transmitter has no
switch-off elements, overvoltage protection devices, lightning
protection, and voltage separation capacity must be provided at
the plant (overvoltage/lightning protection is optional). Check that
the existing operating voltage corresponds to the voltage indicated
on the name plate. The same lines are used for both the power
supply and output signal. In case the surge protection option is
present and the transmitter is installed in a Hazardous area, the
transmitter has to be power supplied from a voltage source isolated
from mains (galvanic separation). Furthermore the potential
equalization for the entire powering cable must be guaranteed
since the intrinsic safety circuit of the transmitter is grounded.
Warning - General risk.
Electrical shock can result in death or
serious injury. Avoid contact with the leads and terminals.
High voltage that may be present on leads can cause
electrical shock.
Warning - General risk.
Do NOT make electrical connections
unless the electrical code designation stamped on the
transmitter data plate agrees with the classification of the area
in which the transmitter is to be installed. Failure to comply
with this warning can result in fire or explosion.
7.1 Cable connection
Depending on the design supplied, the electrical connection is
established via a cable entry, M20 x 1.5 or 1/2-14 NPT thread,
or Han 8D plug (8U) (PROFIBUS PA and FOUNDATION
Fieldbus: M12 x 1 or 7/8 plug). The screw terminals are suitable
for wire cross sections of up to 2.5 mm2 (AWG 14).
Important.
With Category 3 transmitters for use in “Zone 2”, a
qualified cable gland for this type of protection must be installed by
the customer (see the section “Hazardous Area Consideration”). An
M20 x 1.5 threads is located in the electronics housing for this
purpose.
For transmitters with “Flameproof enclosure” (Ex d) type of
protection, the housing cover must be secured using the locking
screw.
The screw plug that may have been supplied with the transmitter
must be sealed at the plant using Molykote DX.
The installer assumes responsibility for any other type of sealing
medium used.
At this point, we wish to draw your attention to the fact that
increased force will be required to unscrew the housing cover after
an interval of several weeks. This is not caused by the threads, but
instead is due solely to the type of gasket.
7.2 FOUNDATION Fieldbus wiring
The 2600T-266 PdP FF is a Bus Powered device with Fieldbus
Foundation output. The two wires of the bus have to be
connected as in the picture.
Important.
The 266 PdP FF is not Polarity Sensitive
Figure 36: 266 Tx with FOUNDATION Fieldbus terminal block