To suppress machine resonance, the speed loop gain must be lowered to lower the overall speed re-
sponse. If the notch filter is used at this time, the speed loop gain at only near the preset resonance
point can be lowered, and the speed loop gain at other than the resonance point can be set higher. As
a result, the overall speed response can be increased.
When “0” (dB) is set to “attenuation level,” the notch filter is disabled.
Speed Control Speed Loop Switching Time at Parameter Change
(3014Hex-1AHex)
Parameters can be switched even when the inverter is operating. The parameters that can be switch-
ed include the P gain and I integral time of the speed control system. When these parameters are
switched while the inverter is operating, in some load operating conditions, sudden torque fluctuations
may occur and cause mechanical shock which may be problematic.
To alleviate this kind of shock, suppress sudden fluctuations in torque by setting the ramp function in
Speed Control Speed Loop Switching T
ime at Parameter Change (3014Hex-1AHex) when switching
parameters.
Parameter
No.
Function name Data Default data Unit
3014Hex-1AH
ex
Speed Control Speed Loop
Switching Time at Parameter
Change
0.000 to 1.000 0.000
s
Slip Frequency Limit (3014Hex-47Hex)
A limiter can be set to PI calculation output of speed control systems by V/f control with speed sensor
and dynamic torque vector control with speed sensor. This is enabled only when “3: IM V/f control with
speed sensor” or “4: IM Dynamic torque vector control with speed sensor” is selected at Drive Control
Selection (3004Hex-2BHex/3009Hex-0FHex).
In a normal control state, PI calculation output is within “slip frequency × maximum torque %.”
When an abnormal state, for example, a temporary excessive load, occurs, PI calculation output devi-
ates considerably and it sometimes takes time to return to a normal state. For this reason, abnormal
operation can be suppressed by limiting PI calculation output.
7 Vector Control and Applied Functions
7-30
M1 Series EtherCAT Type User’s Manual (I670)
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