Mitsubishi Electric 800 Series Instruction Manual page 402

Analog input time constant (Pr.74)
• It is effective to eliminate noise on the frequency setting circuit.
• Increase the filter time constant if steady operation cannot be performed due to noise, etc.
A larger setting results in slower response. (The time constant can be between 0 and 8, which are about 5 ms to 1 s.)
Analog speed command input time constant (Pr.822, Pr.832)
• Set the primary delay filter time constant to the external speed command (analog input command) by using Pr.822 Speed
setting filter 1.
• To change the time constant, for example, in a case where only one inverter is used to switch between more than one
motor, use Pr.832 Speed setting filter 2.
• Pr.832 Speed setting filter 2 is enabled when the RT signal is ON.
Analog torque command input time constant (Pr.826, Pr.836)
• Set the primary delay filter time constant to the external torque command (analog input command) by using Pr.826 Torque
setting filter 1.
• To change the time constant, for example, in a case where only one inverter is used to switch between two motors, use
Pr.836 Torque setting filter 2.
• Pr.836 Torque setting filter 2 is enabled when the RT signal is ON.
Analog speed command input offset adjustment (Pr.849)
• This is used to set a range in which the motor is stopped for prevention of incorrect motor operation in a very low speed
rotation by the analog input speed command.
• Regarding the Pr.849 Analog input offset adjustment value 100% is 0, the offset voltage is set as described below:
100% < Pr.849 ....... Positive side
100% > Pr.849 ....... Negative side
The detailed calculation of the offset voltage is as described below:
Offset voltage [V] = Voltage at the time of 100% (5 V or 10 V

It depends on the Pr.73 setting.
Frequency
command
0%
0% 100%
NOTE
• Under PID control, the analog input filter is invalid (no filter).
Parameters referred to ???????
Pr.73 Analog input selection page 393
Pr.125, Pr.902, Pr.903 (bias and gain of the terminal 2 frequency setting)
Slope determined
according to Pr.125,
Pr.902, and Pr.903
Slope does not
change.
Speed setting
100%
signal
(10 V or 5 V)
200% Pr.849 setting
(T) Multi-Function Input Terminal Parameters
)  (Pr.849 - 100)/100

page 402
401
PARAMETERS
5
GROUP
T