Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control (PanelView 550) - Manual (Page 129)

Rockwell Automation Publication 7000-UM151E-EN-P - January 2013 129
Component Definition and Maintenance Chapter 3
Figure 94 - Process Loop Transmitter block diagram
This type of transmitter is known as a 4-wire transmitter, and will “sink” current
from a receiver. The receiver is connected by two wires only from pins 20 (+
connection) and either pins 18, 19, 21 (- connection).
The recommended connection is shown above. The type of shielded cable used is
application specific and is determined by the length of the run, the characteristic
impedance and the frequency content of the signal.
Isolated Process Receiver
These inputs are individually configurable to accept either a
-10/0/+10V input signal or a 4-20 mA signal. When configured for voltage
input, each channel has an input impedance of 75 K ohms. When used as a
current loop input, the transmitter must have a minimum loop compliance of 2
volts to satisfy the 100 ohm input impedance. Regardless of input configuration,
each input is individually isolated to ± 100V DC or 70V RMS AC.
5V
DSP
FPGA
#
ŀ
Isolated
DC/DC
Converter
+15V
+15V
D/A
Current
Boost
Optical
Interface
20
18
19
21
IFM