Mitsubishi Electric 800 Series Instruction Manual page 336

 Calibration of analog input bias and gain (Pr.919 to Pr.920, Pr.932 to
Pr.933)
• "Bias"/"gain" function can adjust the relation between the stall prevention operation level and the setting input signal.
Examples of setting input signals are 0 to 5 VDC, 0 to 10 VDC, or 4 to 2 mADC, and they are externally input.
• Set the bias value of the terminal 1 input using Pr.919. (Shipped from factory with the stall prevention operation level for 0
V)
• Set the stall prevention operation level against the input voltage set by Pr.73 Analog input selection with Pr.920. (Initial
value is 10 V.)
• Set the bias value of the terminal 4 input using Pr.932. (The initial value is the stall prevention operation level for 4 mA.)
• Set the stall prevention operation level against the 20 mA for input current (4 to 20 mA) with Pr.933.
Stall prevention operation level (%)
400
150
(-5 V)
Bias
(-10 V)
Pr.919
-100%
0
0
0
Pr.919
-150
∗1
Calibration example of terminal 1
*1 If a negative command is given, the stall prevention operation level 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).
336
Method to adjust only stall prevention operation level 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%
Analog input 5 V
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
Stall prevention operation level (%)
400
150
Bias
Pr.932
0 20
0 4
Analog input
Pr.932
Calibration example of terminal 4
page 337
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)
5.9 (T) Multi-Function Input Terminal Parameters
3
4
5
5
5
Gain
Pr.933 6
Initial value
7
100%
20 mA
Pr.933
8
9
page 336
page
10
335
5. PARAMETERS