Chapter 4: AC Drive Parameters
4–52
Example 6: Reduced Analog Gain
This example shows how to limit the Maximum Frequency Reference by reducing
the Analog Input Gain. When the Analog Input is at its maximum value (10V or
20mA), the set-point frequency will be 50Hz. However, this reduced maximum
frequency applies only to an Analog Input Source of Frequncy Command. The
Maximum Output Frequency can still can still go to 60 Hz if controlled from the
Keypad, RS-485 interface, Jog Command, or Multi-Speed settings.
• Minimum Frequency Reference = 0Hz
• Maximum Frequency Reference = 50 Hz
Calculations
A) Max Output Frequency = (1750 rpm / 1750 rpm) x 60 Hz = 60 Hz
B) Analog Offset % = (0Hz / 50 Hz) x 100 = 0%
C) Analog Gain % = ((50 Hz – 0Hz) / 60 Hz) x 100 = 83.3%
D) Mid-point Frequency = ((50 Hz – 0Hz) / 2) + 0Hz = 25 Hz
Parameter Settings
P4.01: 00 (default) – Offset disabled
P4.02: 00 (default) – 0% Analog Input Offset
P4.03: 71.4 – 71.4% Analog Input Gain
P4.04: 00 (default) – Forward Motion Only
Results
Max. Output Frequency
Max. Frequency Reference
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