ABB 266 DDS, Manual

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2 6 6 DDS H A RT |
P R E SSU R E T R A N SM I T T ER S | O I/ 2 6 6 D DS - EN R E V. B 17
5 Transmitter wiring
Observe the applicable regulations governing electrical installation. Wiring must be executed in absence of power supply.
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 equipotentiality for the entire
powering cable must be guaranteed since the intrinsic safety circuit of the transmitter is grounded.
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.
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.
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.
The screw terminals are suitable for wire cross sections of up to 2.5 mm2 (AWG 14).It is recommended that you strip approx. 30 to
35 mm (1.18 to 1.38 in) off the cable jacket (see figure 14). Use wiring rated 10 °C minimum above ambient temperature).
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”). A thread is in the electronics housing for this purpose. For
ransmitters 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.
Analog output (HART) transmitter wiring
Figure 16 - HART transmitter connection scheme
WARNING - GENERAL RISKS
IMPORTANT