4–49
Example 3: Positive Offset
In this example, the Analog Input will have a positive offset while still using the
full scale of the potentiometer or other analog signal device. When the analog
signal is at its lowest value (0V, 0mA, or 4mA), the set-point frequency will be at
10Hz. When analog signal is at its maximum value (10V or 20mA), the set-point
frequency will be 60 Hz.
• Minimum Frequency Reference = 10 Hz
• Maximum Frequency Reference = 60 Hz
Calculations
A) Max Output Frequency = (1750 rpm / 1750 rpm) x 60 Hz = 60 Hz
B) Analog Offset % = (10 Hz / 60 Hz) x 100 = 16.7%
C) Analog Gain % = ((60 Hz – 10 Hz) / 60 Hz) x 100 = 83.3%
D) Mid-point Frequency = ((60 Hz – 10 Hz) / 2) + 10 Hz = 35 Hz
Parameter Settings
P4.01: 01 – Positive Input Offset Polarity
P4.02: 16.7 – 16.7% Analog Input Offset
P4.03: 83.3 – 83.3% Analog Input Gain
P4.04: 00 (default) – Forward Motion Only
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