Mitsubishi Electric 800 Series Instruction Manual (Function page 358

 Analog speed command input time constant (Pr.822, Pr.832)
• Use Pr.822 Speed setting filter 1 to set the primary delay filter time constant to the external speed command (analog
input command). Increase the setting of the time constant to allow delays in follow-up of the speed command or when the
analog input voltage is unstable.
• Use Pr.832 Speed setting filter 2 to change the time constant to use one inverter to switch operation between two or more
motors.
• Pr.832 Speed setting filter 2 is enabled when the RT signal is ON.
 Analog torque command input time constant (Pr.826, Pr.836)
• Use Pr.826 Torque setting filter 1 to set the primary delay filter time constant to the external torque command (analog
input command). Increase the setting of the time constant to allow delays in follow-up of the torque command or when the
analog input voltage is unstable.
• Use Pr.836 Torque setting filter 2 to change the time constant to use one inverter to switch operation between two or
more motors.
• Pr.836 Torque setting filter 2 is enabled when the RT signal is ON.
 Analog speed command input offset adjustment (Pr.849)
• Use this parameter to set a range in which the motor is stopped for prevention of incorrect motor operation in a very low
speed rotation when the speed command is an analog input (voltage/current) via terminal 2.
• Example) Voltage command given
The voltage range is offset according to the setting in Pr.849 Analog input offset adjustment, assuming that 100%
corresponds to zero.
100% < Pr.849 ...... Positive side
100% > Pr.849 ...... Negative side
The detailed calculation of the offset voltage is as follows:
Offset voltage [V] = Voltage at the time of 100% (5 V or 10 V
*1 It depends on the Pr.73 setting.
Frequency
command
0%
0% 100%
NOTE
• The analog input filter is invalid (no filter) during PID control operation.
Parameters referred to
Pr.73 Analog input selectionpage 350
Pr.125, C2 to C4 (Pr.902, Pr.903) (bias and gain of the terminal 2 frequency
Slope determined
according to Pr.125 and
C2 to C4 (Pr.902, Pr.903)
Slope does not
change.
Speed setting
100%
signal
(10V or 5V)
200% Pr.849 setting
*1
) × (Pr.849 - 100) / 100
setting)page 358
14. (T) Multi-Function Input Terminal Parameters
14.3 Response level of analog input and noise elimination
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