Acromag DT236-0600, Руководство пользователя, Страница: 10 / 40

Model DT23x-0600 Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: 248-295-0880 - 10 -
http://www.acromag.com
- 10 - https://www.acromag.com
Output/Power
Connections
… continued
The traditional loop-powered 2-wire
“sinking” or passive output connection is
shown below. Shielded twisted-pair wiring is often used at the output to connect
the longest distance between the field transmitter and the remote receiver of the
output loop as shown. Each passive output of this transmitter is isolated and
fluctuates relative to earth ground by the voltage drop in its output load and
connection wire.
In most installations, the output loop power supply will be local to either the unit, or
local to the remote receiver of the output loop. Common receiver devices may
include the input channel of a Programmable Logic Controller (PLC), a Distributed
Control System (DCS), or a panel meter. Some receiver devices already provide
excitation for the transmitter loop and these are referred to as
“sourcing” or active
inputs. Other receivers that do not provide loop excitation are referred to as
“sinking” or passive inputs, and these will require that a separate power supply
connect within the loop. These types of receivers are depicted in the figures of the
next two pages.
WARNING:
For compliance to applicable safety and performance standards,
the use of twisted pair output wiring is recommended. Failure to adhere to
sound wiring and grounding practices as instructed may compromise safety,
performance, and possibly damage the unit.