Response Level Of Analog Input And Noise Elimination - Mitsubishi Electric 800 Series Instruction Manual

12.3
Response level of analog input and noise
elimination
The response level and stability of frequency command / torque command using the analog input signal (terminal 2 or 4) can
be adjusted.
Pr.
74
Input filter time constant
T002
822
Speed setting filter 1
T003
826
Torque setting filter 1
T004
832
Speed setting filter 2
T005
836
Torque setting filter 2
T006
849 Analog input offset
T007 adjustment
 Block diagram
Terminal 2 (4) input
 Analog input time constant (Pr.74)
• Use this parameter to eliminate noise on the frequency setting circuit.
• Increase the filter time constant if the operation is unstable due to noise or other factors.
If the setting is too large, response becomes slow. (The time constant can be between 0 and 8, which are about 5 ms to 1
s.)
280
12.(T) Multi-Function Input Terminal Parameters

12.3 Response level of analog input and noise elimination

Name Initial value
1
9999
9999
9999
9999
100%
RT-OFF
RT-ON
Setting range
Set the primary delay filter time constant to the analog input
0 to 8 command. If the setting is too large, response becomes
slow.
Set the primary delay filter time constant to the external
0 to 5 s
speed command (analog input command).
9999 As set in Pr.74.
Set the primary delay filter time constant to the external
0 to 5 s
torque command (analog input command).
9999 As set in Pr.74.
Second function of Pr.822 (enabled when the RT signal is
0 to 5 s, 9999
ON)
Second function of Pr.826 (enabled when the RT signal is
0 to 5 s, 9999
ON)
Set offset for the analog speed input (terminal 2). The motor
0% to 200% is prevented from rotating due to noise in the analog input
or other factors when a zero speed command is given.
Pr.74
Pr.822 = 9999
Pr.822
Pr.822 ≠ 9999
Pr.74
Pr.826 = 9999
Pr.826
Pr.826 ≠ 9999
Pr.832 = 9999
Pr.832
Pr.832 ≠ 9999
Pr.836 = 9999
Pr.836
Pr.836 ≠ 9999
Description
Speed command
Torque command