Mitsubishi Electric 800 Series Instruction Manual page 410

Calibration of analog input bias and gain (Pr.919, Pr.920, Pr.932, Pr.933)
• The "bias" and "gain" functions are used to adjust the relationship between the setting input signal such as 0 to 5 VDC/0 to
10 VDC or 4 to 20 mADC entered from outside for torque command or setting the torque limit and the torque.
• Set the bias torque of the terminal 1 input using Pr.919. (Shipped from factory with torque for 0 V)
• Set the torque against the torque command voltage set by Pr.73 Analog input selection with Pr.920. (Initial value is 10 V.)
• Set the bias torque of the terminal 4 input using Pr.932. (The initial value is the torque for 4 mA.)
• Set the torque against the 20 mA for torque command current (4 to 20 mA) with Pr.933.
400
150
(-5V)
Bias
(-10V)
Pr.919
-100%
0
0
0
Pr.919
-150
∗1
Calibration example of terminal 1

A negative voltage (0V to -10 V (-5 V)) is valid as a torque command.
If a negative voltage is input as a torque limit value, the torque limit is regarded as "0".
• There are three methods to adjust the torque setting voltage (current) bias and gain.
- Method to adjust arbitrary point with application of a voltage (current) between terminals 1 and 5 (4 and 5).
- Method to adjust arbitrary point without application of a voltage (current) between terminals 1 and 5 (4 and 5).
410
- Method to adjust only torque without adjusting voltage (current).
NOTE
• Always calibrate the input after changing the voltage/input signal with Pr.73, Pr.267, and the voltage/current input selection
switch.
Analog input display unit changing (Pr.241)
• The analog input display unit (%/V/mA) for analog input bias and gain calibration can be changed.
• Depending on the terminal input specification set to Pr.73, Pr.267, and voltage/current input switches, the analog value
display unit of Pr.919, Pr.920, Pr.932, and Pr.933 changes as described below.
Analog command
(terminals 1 and 4)
(Depends on Pr.73, Pr.267)
0 to 5 V input
0 to 10 V input
0 to 20 mA input
Gain
Pr.920
Initial value
100%
5 V
Torque setting signal
10 V
Pr.920
Pr.241 = 0 (initial value)
0 to 5 V  0 to 100% (0.1%) display
0 to 10 V  0 to 100% (0.1%) display
0 to 20 mA  0 to 100% (0.1%) display
(T) Multi-Function Input Terminal Parameters
400
150
Bias
Pr.932
0 20
0 4
Torque setting signal
Pr.932
Calibration example of terminal 4
page 411
Pr.241 = 1
0 to 100%  0 to 5 V (0.01 V) display
0 to 100%  0 to 10 V (0.01 V) display
0 to 100%  0 to 20 mA (0.01 mA)
Gain
Pr.933
Initial value
100%
20 mA
Pr.933
page 410
page
409
PARAMETERS
5
GROUP
T