Mitsubishi Electric 800 Series Instruction Manual page 159

5.3.4 Torque detection filter
PM PM PM
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.
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
348.)
• 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
5. PARAMETERS
5.3 Speed control under PM motor control
Name Initial value
0 s
9999
Setting range
0 Without filter
0.001 to 0.1 s Set the time constant of primary delay filter torque feedback
signal.
0 to 0.1 s Second function of Pr.827 (enabled when RT signal ON)
9999 Same as Pr.827 setting
Description
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