Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 327)

Component Definition and Maintenance 5-85
7000 “A” Frame 7000A-RM001A-EN-P – January 2011
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 Kohms. 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.
A block diagram of the receiver is shown below.
4,8,12
3,7,11
∩/#
X1 U1
FPGA
DSP
1 st I/P pins
3 rd I/P pins 2 nd I/P pins
A/D
Buffer
2,6,10
1,5,9
Isolation Amplifier
+
+
-
-
Figure 5.64 – Process Loop Receiver Block Diagram
The receiver can accept 4-wire transmitters. The figure below shows the
recommended connections. Again, the type of shielded cable used is
application specific as per the transmitter. Pin numbers shown are for
connection to the first of three isolated process receivers.
VPP
GND
Out
RTN
DC
IFM
1
3
2
4
User supplied power
(Sinking)
4-Wire Transmitter
Figure 5.65 – Process Loop Receiver Connections