Torque Detection Filter; Stabilizing Torque Detection (Pr.827, Pr.837); Employing Multiple Primary Delay Filters - Mitsubishi Electric FR-F800 Instruction Manual

Speed control under PM motor control
5.3.4

Torque detection filter

Set the time constant of primary delay filter for torque feedback signal.
Speed loop response is reduced. Under ordinary circumstances, therefore, use the initial value as it is.
Pr. Name
827
Torque detection filter 1
G216
837
Torque detection filter 2
G316
Stabilizing torque detection (Pr.827, Pr.837)
• Current loop response is reduced. Under ordinary circumstances, therefore, use the initial value as it is.
If there is torque ripple due to high frequency disturbance, adjust until speed stabilizes by gradually raising the setting.
Speed is oppositely destabilized if the setting value is too large.
Employing multiple primary delay filters
• Use Pr.833, Pr.837 if changing filter according to application. Pr.833, Pr.837: Second function selection (RT) signal
NOTE
• The RT signal is a second function selection signal. The RT signal also enables other second functions. (Refer to
• The RT signal is assigned to the terminal RT in the initial setting. Set "3" in any of Pr.178 to Pr.189 (input terminal function
selection) to assign the RT signal to another terminal.
158
PARAMETERS
Initial Setting
value range
0
0 s
0.001 to 0.1 s
0 to 0.1 s
9999
9999
PM PM PM
Description
Without filter
Set the time constant of primary delay filter torque
feedback signal.
Second function of Pr.827 (enabled when RT signal ON)
Same as Pr.827 setting
page 333.)