Rockwell Automation 20B PowerFlex 70, PowerFlex 700 Reference Manual - Manual (Page 24)

Analog Inputs
24 Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013
Configuration #3:
•
[Anlg In Config], bit 0 = “1” (Current)
•
[Speed Ref A Sel] = “Analog In 1”
•
[Speed Ref A Hi] = 60 Hz
•
[Speed Ref A Lo] = 0 Hz
•
[Analog In 1 Hi] = 20 mA
•
[Analog In 1 Lo] = 4 mA
This configuration is referred to as offset. In this case, a 4-20 mA input signal
provides 0-60 Hz output, providing a 4 mA offset in the speed command.
Configuration #4:
•
[Anlg In Config], bit 0 = “0” (Voltage)
•
[Speed Ref A Sel] = “Analog In 1”
•
[Speed Ref A Hi] = 0 Hz
•
[Speed Ref A Lo] = 60 Hz
•
[Analog In 1 Hi] = 10V
•
[Analog In 1 Lo] = 0V
This configuration is used to invert the operation of the input signal. Here,
maximum input (10 Volts) represents 0 Hz and minimum input (0 Volts)
represents 60 Hz.
Analog Scaling
[Speed Reference A Sel] = “Analog In 1”
[Analog In 1 Hi]
20 mA
[Speed Ref A Hi]
60 Hz
[Analog In 1 Lo]
4 mA [Speed Ref A Lo]
0 Hz
4
8
12
16
20
6 0 12 18
Output Hertz
Input mA
24 30 36 42 48 54 60