Response Level Of Analog Input And Noise Elimination (Pr. 74, Pr. 822, Pr. 826, Pr. 832, Pr. 836, Pr. 849) - Mitsubishi Electric FR-A700 Instruction Manual

Frequency/torque setting by analog input (terminals 1, 2 and 4)
6.20.4 Response level of analog input and noise elimination
(Pr. 74, Pr. 822, Pr. 826, Pr. 832, Pr. 836, Pr. 849)
Response level and stability of frequency reference command and torque reference command
by analog input (terminal 1, 2, 4) signal can be adjusted.
Pr.
Name
No.
74
Input filter time constant
822
Speed setting filter 1
826
Torque setting filter 1
832
Speed setting filter 2
836
Torque setting filter 2
Analog input offset
849
adjustment
Time constant of analog input (Pr. 74)
Effective for eliminating noise in the frequency setting circuit. Increase the filter time constant if
steady operation cannnot be performed due to noise.
A larger setting results in slower response (The time constant can be set between approximately
10ms to 1s with the setting of 0 to 8).
Time constant of analog speed command input (Pr. 822, Pr. 832)
Set the time constant of the primary delay filter relative to the external torque command (analog
input command) using Pr. 822 "Speed setting filter 1".
Set a large time constant when you want to delay the tracking of the speed command, when the
analog input voltage fluctuates, etc.
When you want to change time constant when switching two motors with one inverter, use the
Pr. 832 "Speed setting filter 2".
Pr. 832 "Speed setting filter 2" is made valid when the RT signal turns on.
6 - 380
Initial Setting
Description
Value Value
Set the primary delay filter time constant
1 0–8 for the analog input.
A larger setting results in a larger filter.
Set the time constant of the primary
0–5s delay filter relative to the external speed
9999
command (analog input command).
9999 Pr. 74 used
Set the time constant of the primary
0–5s delay filter relative to the external torque
9999
command (analog input command).
9999 Pr. 74 used
Second function of Pr. 822
9999 0–5s/9999
(valid when RT terminal is on)
Second function of Pr. 826
9999 0–5s/9999
(valid when RT terminal is on)
This function provides speed command
by analog input (terminal 2) with offset.
100% 0–200% Motor rotation due to noise, etc. by ana-
log input can be avoided at zero speed
command.
Parameter
Refer to
Parameters referred to
Section
73 Analog input 6.20.2
selection
125 Bias and gain of 6.20.5
C2–C4 the terminal 2 fre-
quency setting