Setting the break point for droop control (Pr.994, Pr.995)
• Set Pr.994 and Pr.995 to have a break point on a droop compensation frequency line. Setting a break point allows the
inverter to raise the droop compensation frequency for light-load (no load) operation without raising it for heavy-load
Increased amount of the
• The droop break point function is disabled when any of the following conditions is met. (Linear compensation by Pr.286 is
Pr.995 = 100% (initial value)
Pr.286 < Pr.994
Pr.994 ≤ Pr.995 × Pr.286 / 100%
Setting multiple droop control types (Pr.679 to Pr.683)
• When the second droop control is set, two sets of droop controls can be switched for use. Turning ON the Second function
selection (RT) signal enables the second droop control.
• The RT signal is the Second function selection signal which also enables other second functions.
• The RT signal is assigned to terminal RT in the initial status. Set "3" in one of Pr.178 to Pr.189 (Input terminal function
selection) to assign the RT signal to another terminal.
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
Parameters referred to
Pr.178 to Pr.189 Input terminal function selection
5.16.17 Speed smoothing control
The output current (torque) of the inverter sometimes becomes unstable due to vibration caused by mechanical resonance.
Such vibration can be suppressed by reducing fluctuation of the output current (torque) by changing the output frequency.
Droop break point gain
Droop break point torque
0 to 200%
0 to 120 Hz
Check the effect by increasing and decreasing the value at around
Set the minimum frequency for the torque variation cycle.
5.16 (G) Control parameters