Mitsubishi Electric FR-F800 Series Instruction Manual page 297

 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 a 0 to 20 mA to the 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 0 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
Pr.858 setting
0 (initial value)
*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.
• To change the stall prevention operation level with the analog signal under PM motor control, set C16 to C19 or C38 to C41
to calibrate terminal 1 or terminal 4. (Refer to
 Further prevention of a trip (Pr.154)
• Pr.154 Voltage reduction selection during stall prevention operation = "0 or 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.)
• Set Pr.154 = "10 or 11" when the overvoltage protective function (E.OV[]) is activated during stall prevention operation in
an application with large load inertia. Note that turning OFF the start signal (STF/STR) or varying the frequency command
during stall prevention operation may delay the acceleration/deceleration start.
Pr.154
0
1 (initial value)
10
11
296
5. PARAMETERS
5.7 (H) Protective function parameter
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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)
Set the current limit level at 0V input
voltage (input current 0mA) using Pr.148.
Pr.868 setting
0 (initial value)
*1
4
9999
0 (initial value)
*1
4
9999
—
E.OC[] countermeasure
Enabled
—
Enabled
—
search engine
V/F V/F
V/F control, Advanced magnetic flux vector control
Terminal 4 function
Frequency command (AU signal-ON)
Stall prevention
*3
—
Stall prevention
—
page 363.)
Magnetic flux Magnetic flux Magnetic flux
V/F V/F
E.OV[] countermeasure
—
—
Enabled
Enabled
Magnetic flux Magnetic flux Magnetic flux
Terminal 1 function
Auxiliary frequency
Stall prevention
—
Auxiliary frequency
Stall prevention
—
—