Mitsubishi FR-A740-00023-EC - Page 157

147
Adjust the output torque of the motor (current)
4
PARAMETERS
(5) Stall prevention operation level setting by terminal 1 (terminal 4) (analog variable) (Pr. 148,
Pr. 149, Pr. 858, Pr. 868)
*1 When Pr. 868 = "4" (analog stall prevention), other functions of terminal 1 (auxiliary input, override function, PID control) do not function.
*2 When Pr. 858 = "4" (analog stall prevention), PID control and speed command from terminal 4 do not function even if the AU signal turns on.
*3 When "4" (stall prevention) is set in both Pr. 858 and Pr. 868, function of terminal 1 has higher priority and terminal 4 has no function.
(6) To further prevent an alarm stop (Pr. 154)
⋅ When Pr. 154 is set to "0", the output voltage reduces during stall prevention operation. By making setting to reduce
the output voltage, an overcurrent trip can further become difficult to occur.
⋅ Use this function where a torque decrease will not pose a problem.
⋅ To set the stall prevention operation level using
terminal 1 (analog input), set Pr. 868 Terminal 1
function assignment to "4".
⋅ Input 0 to 5V (or 0 to 10V) to terminal 1. Select 5V or
10V using Pr. 73 Analog input selection. When Pr. 73 =
"1" (initial value), 0 to ±10V is input.
⋅ To set stall prevention operation level using terminal
4 (analog current input), set "4" in Pr. 858 Terminal 4
function assignment.
Input 0 to 20mA to terminal 4. The AU signal need
not be turned on.
⋅ Set the current limit level at the input voltage of 0V
(0mA) in Pr. 148 Stall prevention level at 0V input
⋅ Set the current limit level at the input voltage of 10V/
5V (20mA) in Pr. 149 Stall prevention level at 10V input.
Pr. 858 Setting Pr. 868 Setting
V/F, Advanced Magnetic Flux Vector Control
Terminal 4 function Terminal 1 function
0
(initial value)
0
(initial value)
Frequency command
(AU signal-ON)
Frequency auxiliary
1 Magnetic flux command
2
⎯
3
⎯
4 *1 Stall prevention
5
⎯
6 Torque bias
9999
⎯
1
0
(initial value)
Magnetic flux command
⎯
1 ⎯ Magnetic flux command
2
Magnetic flux command
⎯
3
⎯
4 *1 Stall prevention
5
⎯
6 Torque bias
9999
⎯
4 *2
0
(initial value)
Stall prevention
Frequency auxiliary
1 Magnetic flux command
2
⎯
3
⎯⎯
4 *1
⎯ *3
Stall prevention
5
Stall prevention
⎯
6 Torque bias
9999
⎯
9999
⎯⎯ ⎯
REMARKS
⋅ The fast response current limit level cannot be set.
Pr. 154 Setting Description
0 Output voltage reduced
1
(initial value)
Output voltage not reduced
100%
50%
Current limit level (%)
(5V/10VDC)
(20mA)
(-5V/10VDC)
Input voltage (V)
Set the current limit level at 10V/5V input
power (input current 20mA) using Pr. 149.
Set the current limit level at 0V input
voltage (input current 0mA) using Pr. 148.
0V
0mA
Input current (mA)
200%
150%
Initial setting