Rockwell Automation Publication 7000-UM202D-EN-P - May 2018 157
Control Component Definition and Maintenance Chapter 3
Analog Inputs and Outputs
The PowerFlex™ 7000 drive offers one isolated process current loop transmitter
and three isolated process current loop receivers, embedded into the control.
These are accessible on the ACB.
The isolated process output is configured as 4-20 mA. The three isolated
process inputs are individually configurable for either a range of -10/0/+10V
or 4-20 mA.
The following information details the connections for each input and output.
Current Loop Transmitter
The current loop transmitter sends a 4-20 mA output to an external receiver.
The loop compliance on the transmitter is 12.5V. Loop compliance is the
maximum voltage at which a transmitter can generate to achieve the maximum
current and is usually a function of the power supply voltage. Therefore, the
PowerFlex 7000 transmitter can drive a receiver with an input resistance up to
625 Ω. Figure 132
shows a block diagram of the transmitter.
Figure 132 - 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).
DSP
FPGA
+15V
Isolated
DC/DC
Converter
+15V
5V
Optical Interface
D/A
#
Current Boost
IFM
20
18
19
21
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