Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 108)

108 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 2 Feedback and I/O
This configuration is used when non-default settings are desired for minimum
and maximum speeds, but full range (0…10V) scaling from 0…60 Hz is still
desired.
In this example, a deadband from 0…2.5V and from 7.5…10V is created.
Alternatively, the analog input deadband could be eliminated while maintaining
the 15 and 45 Hz limits with the following changes:
• P548 [Spd Ref A AnlgLo] = 15 Hz
• P547 [Spd Ref A AnlgHi] = 45 Hz
Example 3
• P255 [Anlg In Type], Bit 0 = “0” (Voltage)
• P545 [Spd Ref A Sel] = “Analog In 1”
• P547 [Spd Ref A AnlgHi] = 30 Hz
• P548 [Spd Ref A AnlgLo] = 0 Hz
• P61 [Anlg In1 Hi] = 10V
• P62 [Anlg In1 Lo] = 0V
This is an application that requires only 30 Hz as a maximum output frequency
but is still configured for full 10V input. The result is that the resolution of the
input has been doubled, providing 1024 steps between 0 and 30 Hz.
15 Hz 45 Hz 60 Hz 0 Hz
P61 [Anlg In1 Hi]
10V
P522 [Min Fwd Speed] P520 [Max Fwd Speed]
Motor Operating Range
Command Frequency
P62 [Anlg In1 Lo]
0V
P548 [Spd Ref A AnlgLo] Slope defined by (Analog Volts)/(Command Frequency) P547 [Spd Ref A AnlgHi]
Frequency Deadband
7.5…10 Volts
Frequency Deadband
0…2.5 Volts
10
9
8
7
6
5
4
3
2
1
0
0 10 20 30 40 50 60
Output Hertz
Inp
ut V
ol
ts