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

12.3 Response level of analog input and noise elimination

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