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Volts/Hz Page
The Volts/Hz page is used to configure the unit settings that are related to
operation of the Volts/Hz compensation function. The parameters define a
curve, which determines the Volts/Hz response.
• Volts per Hertz Upper Knee Frequency - Establishes the frequency at
which the V/Hz characteristic starts to reduce the generator voltage as a
function of generator frequency. Tag VperHz_HiKneeFreq in the
configuration table stores this value, expressed in Hertz. The upper knee
frequency must be greater than the lower knee frequency.
• Volts per Hertz Upper Slope - Establishes the rate at which the V/Hz
characteristic reduces the generator voltage as a function of generator
frequency between the upper and lower knee frequencies. Tag
VperHz_HiSlope in the configuration table stores this value, expressed as
a number that reflects per unit change in voltage for each per unit change
in frequency.
• Volts per Hertz Lower Knee Frequency - Establishes the frequency at
which the V/Hz characteristic starts to reduce the generator voltage at the
lower slope rate as a function of generator frequency. Tag
VperHz_LoKneeFreq in the configuration table stores this value,
expressed in Hertz. The lower knee frequency must be less than the upper
knee frequency.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
CGCM-DLR Unit Configuration
Chapter 4
95
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