Delta Controls DPT-2000 - Manual (Page 27)

25 IOM-DPT-A: FEB 2014
14. FIGURES.
Input
circuit module
Sensing
1
+
_
system
Power supply/
measurement
min.250
Load resistance
Output
Proc
essor
a/c
Converter
circuit
Modem
Comm
unica
tor
filter
Noise
2
D

Memory
Fig.1. DPT... transmitters – block diagram.
For successful communication with transmitter the resistance in measuring loop, behind connected
device to communication, should be higher than 250Ω. If necessary install the additional resistor in the
line. The communicator or modem connecting ways to the measuring loop are presented at diagrams.
During increasing of resistance in the measure loop at making the good transmission, is necessary to
make sure that the tension falls at sum resistances in the loop don't lower minimum tension at
transmitter terminals. (see p.5.1.).
Electrical connections for DPT... transmitters
Rys. 2a
- +
SIGNAL 240 
Pow
er
Ro
mA
4÷20 mA
+
_
F1
. 3 2
VWX
MNO
DEF
YZ#
5 6 PQR * +/
9
GHI
8 0
@%&
1
STU
4 JKL
ABC
7
RE PV F4 PF
F2 F3 F4
APT2000
Configurator
BELL
202
RS 232
Commu
nicato
r
Current loop
Switch box
+
T
EST
-T
EST
JUMPER
supply
Fig.2a. The link of transmitter and communicator or modem to current line by the switch box ( in case of the
resistance in current loop is higher than 250Ω).
D-SOFT