Acromag DT236-0600, Руководство пользователя, Страница: 36 / 40

Model DT23x-0600 Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: 248-295-0880 - 36 -
http://www.acromag.com
- 36 - https://www.acromag.com
Output …continued
CAUTION:
Do not exceed 36VDC
peak to avoid damage to the unit.
Terminal voltage at/above 7V
minimum must be maintained
across the output during
operation.
Compute R
load
(Max) =
(V
supply
- 7V)/0.021A for 21mA
output current. Refer to the
table at right.
Output Power Supply: Loop powered from 7-32V DC SELV (Safety Extra Low
Voltage), 24mA maximum. The voltage across the output must never exceed 36V,
even with a shorted load. Set this level to provide a minimum of 21mA over-range
current to the load (0.021*R typical), plus 7V across the output terminals, plus any
interim line drop. Reverse polarity protection is inherent as output terminals are not
polarized (± output labels of enclosure are for reference only).
Output Power Supply Effect: Less than

0.001% of output span effect per volt DC of
supply change within rated limits for load.
Output Load Resistance Effect: Less than

0.001% of output span effect for a

100

change in load resistance.
Output Compliance and Load Resistance Equation: 7V minimum is required for each
transmitter channel. A channel will drive up to 17V to a load with a 24V loop supply
and 20mA of loop current (800
Ω), assuming negligible line drop.
V
supply
Volts Max R
load
w/21mA and No IR Line Drop
7V 0Ω
10V 143 Ω
12V 238 Ω
18V 524 Ω
24V 81 0Ω
32V 119 0Ω
USB Interface
Unit includes a USB socket for temporary connection to a PC or laptop for set up and
reconfiguration (or optionally to a USB-OTG cable connected to an Android
smartphone or tablet). USB isolation is required when connected to a grounded
input sensor or driver (see note below). During reconfiguration and calibration, the
transmitter receives power from both the USB port and the output loop. Both power
sources must be present to calibrate the unit.
CAUTION: Do not attempt to connect USB in a hazardous environment. Transmitter
should be set up and configured in a safe environment only.
Data Rate: USB v1.1 full-speed only, at 12Mbps. Up to 32K commands per second.
USB 2.0 compatible.
Transient Protection: Adds transient voltage protection on USB power & data lines.
Inrush Current Limiting: Includes series inrush current limiting at USB power.
Cable Length/Connection Distance : 5.0meters maximum.
!