Mitsubishi Electric FR-A800 Series Instruction Manual page 438

• Set Pr.149 Stall prevention level at 0 V input to the current limit level when input voltage is 10 V/5 V (20 mA).
Current limit level (%)
(-5V/10VDC)
Pr.858 setting
0 (initial value)
1
*2
4
9999
*1 When Pr.868 = "4" (analog stall prevention), the other functions of terminal 1 (auxiliary input, override function, PID control) do not operate.
*2 When Pr.858 = "4" (analog stall prevention), PID control and speed commands via terminal 4 do not operate even when the AU signal is ON.
*3 When both 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.
 Further prevention of a trip (Pr.154)
• Pr.154 Voltage reduction selection during stall prevention operation = "0, 10", the output voltage is reduced during
stall prevention operation. By making this setting, an overcurrent trip becomes less likely to occur. Use this setting when
torque reduction does not pose a problem. (Under V/F control, the output voltage is reduced only during the stall prevention
operation is activated.)
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Set the current limit level at 10V/5V input
power (input current 20mA) using Pr.149.
200%
150%
100%
50%
0V (5V/10VDC)
0mA
(20mA)
Set the current limit level at 0V input
voltage (input current 0mA) using Pr.148.
Pr.868 setting
0 (initial value)
1
2
3
*1
4
5
6
9999
0 (initial value)
1
2
3
*1
4
5
6
9999
0 (initial value)
1
2
3
*1
4
5
6
9999
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Input voltage (V)
Input current (mA)
V/F, Advanced magnetic flux vector control
Terminal 4 function
Frequency command (AU signal-ON)
—
Stall prevention
—
*3
—
Stall prevention
—
Terminal 1 function
Auxiliary frequency
—
—
—
Stall prevention
—
—
—
—
—
—
—
Stall prevention
—
—
—
Auxiliary frequency
—
—
—
Stall prevention
—
—
—
—
5. PARAMETERS
5.10 (H) Protective function parameter
1
2
3
4
5
6
7
8
9
10
437