ABB 266 HART Series, Инструкция по эксплуатации

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2600T Series Pressure transmitters | OI/266/HART-EN Rev. M 29
6 Transmitter wiring
6 Transmitter wiring
6.1 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.
Connectors related to different protocols are available on
request. 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”). A
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.
6.2 Analogue output (HART) transmitter wiring
1 - Inner ground termination
point
2 - External ground
termination point
3 - Hand-held communicator
4 - Line load
5 - Remote indicator
6 - Power source
7 Locking screw
+
-
+
+
-
-
691HT
A B C
1
D E F
2
G H I
3
J K L
4
M N O
5
P Q R
6
S T U
7
V W X
8
Y Z #
9
@ % & /
0
+
-
PV
REVIE W SERIAL
LINK
TRI M
F1 F2 F3 F4
CONF
-
2
1
+
1
2
5
4
3
6
HART hand-held communicator may be connected at any
wiring termination point in the loop, providing the minimum
resistance is 250 ohm. If this is less than 250 ohm, additional
resistance should be added to allow communications. The
handheld terminal is connected between the resistor and
transmitter, not between the resistor and power source.
Figure 40: HART transmitter connection scheme
Warning - General risks. 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.
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.
7