Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 143)

Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014 143
Component Definition and Maintenance Chapter 3
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. When used as a current loop input, the transmitter
must have a minimum loop compliance of 2V to satisfy the 100 input
impedance. Regardless of input configuration, each input is individually isolated
to ± 100V DC or 70V RMS AC.
Figure 115 shows a block diagram of the receiver.
Figure 115 - Process Loop Receiver Block Diagram
The receiver can accept 4-wire transmitters. Figure 116 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.
Figure 116 - Process Loop Receiver Connections
4,8,12
3,7,11
ŀ/#
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
+
+
-
-
VPP
GND
Out
RTN
DC
IFM
1
3
2
4
User supplied power
(Sinking )
4-Wire Transmitter