Rockwell Automation SA3100 Distributed Power System Drv Config,Program - Manual (Page 33)

Configuring the UDC Module, Regulator Type, and Parameters 2-21
• Voltage Boost Volts (Volts)
Voltage Boost Volts and Voltage Boost Frequency define a point on the V/Hz curve
where the slope changes, typically to accommodate low frequency instability.
Resolution is 0.01V. Voltage Boost Volts is typically used to extend the range at
constant torque to lower frequencies. This can also be used to avoid the “low
frequency instability region” which is found in some motors with low or no
connected inertia and low friction loads. When using the voltage boost with the
variable torque configuration, the voltage value raises or lowers the central portion
of the V/Hz characteristic (see Figure E.3).
• Voltage Boost Frequency (Hertz)
Voltage Boost Frequency and Voltage Boost Volts define a point in the V/Hz curve
where the slope changes, typically to accommodate low frequency instability.
Resolution is 0.001 Hz.
• Voltage Offset at Zero Hertz (Volts)
Voltage Offset at Zero Hertz is the voltage to be added at zero hertz to adjust the
initial point on the volts per hertz curve. Resolution is 0.001V.
2.4.4 Feedback and Control Data Screen (Volts per Hertz)
No speed feedback is used with the Volts per Hertz regulator. The following Control
Data Parameters can be entered with this screen. See figure 2.12.
Figure 2.12 – Speed Feedback and Control Parameter Entry Screen (Volts per Hertz)