Mitsubishi Electric 800 Series Instruction Manual page 338

Stall prevention operation level setting (analog variable) from terminal 1
(terminal 4) (Pr.148, Pr.149, Pr.858, Pr.868)
• To use the terminal 1 (analog voltage input) to set the stall prevention operation level, set Pr.868 Terminal 1 function
assignment = "4". Then, input a 0 to 5 V (or 0 to 10 V) to the terminal 1. To choose whether 5 V or 10 V, use Pr.73 Analog
input selection. In the initial status, Pr.73 = "1 (initial value)" is set to choose 0 to ±10 V input.
• When setting the stall prevention operation level from terminal 4 (analog current input), set Pr.858 Terminal 4 function
assignment = "4".
• Input 0 to 20 mA into terminal 4. There is no need to turn ON the AU signal.
• Set Pr.148 Stall prevention level at 0 V input to the current limit level when input voltage is 0 V (0 mA).
• Set Pr.149 Stall prevention level at 10 V input to the current limit level when input voltage is 10 V/5 V (20 mA).
Current limit level (%)
200%
150%
100%
50%
0V
(-5V/10VDC)
0mA
Set the current limit level at 0V input
voltage (input current 0mA) using Pr.148.
Pr.858 setting Pr.868 setting
0
(initial value)
1
2
0
3
(initial value)
4

5
6
9999
0
(initial value)
1
2
3
1
4

5
6
9999
0
(initial value)
1
2
3
4

4

5
6
9999
9999 ―

When Pr.868 = "4" (analog stall prevention), the other functions for terminal 1 (auxiliary input, override function, PID control) will be disabled.

When Pr.858 = "4" (analog stall prevention), PID control and speed commands using terminal 4 will not operate, even if the AU signal turns ON.

When both of Pr.858 and Pr.868 are set to "4" (stall prevention), terminal 1 functions take priority and terminal 4 has no function.
NOTE
• The fast-response current limit cannot be set.
Set the current limit level at 10V/5V input
power (input current 20mA) using Pr.149.
Input voltage (V)
(5V/10VDC)
Input current (mA)
(20mA)
Terminal 4 function
Frequency command (AU signal-ON)
―
Stall prevention
―
―

Stall prevention
―
(H) Protective function parameter
V/F, Advanced magnetic flux vector control
Auxiliary frequency
―
―
―
Stall prevention
―
―
―
―
―
―
―
Stall prevention
―
―
―
Auxiliary frequency
―
―
―
Stall prevention
―
―
―
―
Terminal 1 function
PARAMETERS
5
GROUP
H
337