Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
95
CGCM-DLR Unit Configuration
Chapter
4
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.