Mitsubishi Electric FR-F820-00046 Instruction Manual page 280

• 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
Set the current limit level at 0V input
voltage (input current 0mA) using Pr.148.
Pr.858 setting
0 (initial value)
*1
0 (initial value)
4
9999
0 (initial value)
*2 *1
4 4
9999
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, 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 E.OC[] countermeasure
0 Enabled
1 (initial value) —
10 Enabled
11 —
 Trip during stall prevention operation (Pr.874)
• The inverter can be set to trip at activation of stall prevention and stalling of the motor.
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)
Pr.868 setting
Frequency command (AU signal-ON)
Stall prevention
*3
—
Stall prevention
—
page
E.OV[] countermeasure
—
—
Enabled
Enabled
V/F, Advanced magnetic flux vector control
Terminal 4 function
344.)
V/F V/F Magnetic flux Magnetic flux Magnetic flux
PM PM PM
Terminal 1 function
Auxiliary frequency
Stall prevention
—
Auxiliary frequency
Stall prevention
—
—
5. PARAMETERS
5.7 (H) Protective function parameter
1
2
3
4
5
6
7
8
9
10
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