Mitsubishi Electric FR-F740-00023-EC Instruction Manual page 73

Adjust the output torque of the motor (current)
(4) Set multiple stall prevention operation levels (Pr. 48, Pr. 49)
During acceleration
Pr.48 During deceleration/constant speed During deceleration/constant speed During deceleration/constant speed
Running frequency
Pr.49
Set frequency exceeds Pr. 49
Output
frequency (Hz)
Set
frequency
Pr.49
Stall
prevention
level Pr. 22
used
Set frequency is Pr. 49 or less
Output
frequency (Hz)
Pr.49
Set
frequency
Pr. 22
used
REMARKS
⋅ When Pr. 49 ≠ "9999" (level changed according to frequency) and Pr. 48 = "0%", the stall prevention operation level is 0% at or
higher than the frequency set in Pr. 49.
⋅ In the initial setting, the RT signal is assigned to the RT terminal. By setting "3" to any of Pr. 178 to Pr. 189 (input terminal function
selection), you can assign the RT signal to the other terminal.
CAUTION
⋅ Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Please
make setting after confirming the function of each terminal.
⋅ The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 93)
(5) Stall prevention operation level setting by terminal 1 (analog variable) (Pr. 148, Pr. 149)
Current limit level (%)
120%
Initial setting
110%
100%
50%
0
(-5VDC/10V)
Current limit level at input voltage 0V
(input current 0mA),
Set using Pr. 148.
REMARKS
⋅ The fast-response current limit level cannot be set.
⋅ When Pr. 22 = 9999 (analog variable), functions other than the terminal 1 (auxiliary input, override function, PID control) are not
executed.
62
⋅ Setting "9999" in Pr. 49 Second stall prevention operation frequency and
turning the RT signal on make Pr. 48 Second stall prevention operation
current valid.
⋅ In Pr. 48, you can set the stall prevention operation level at the output
frequency from 0Hz to that set in Pr. 49.
During acceleration, however, the operation level is as set in Pr. 22.
⋅ This function can also be used for stop-on-contact or similar operation by
decreasing the Pr. 48 setting to weaken the deceleration torque (stopping
torque).
Pr. 49 Setting
Output
(initial value)
frequency
0.01Hz to 400Hz
Time
Pr. 48
used
*1 The smaller setting of the stall prevention operation levels set in Pr. 22 and Pr. 48
has a higher priority.
*2 When Pr. 22 = "9999" (Stall prevention operation level analog input), the stall
prevention operation level also switches from the analog input (terminal 1 input)
to the stall prevention operation level of Pr. 48 when the RT signal turns on.
Output
frequency (The second stall prevention operation level cannot be input in an analog form.)
Time
Pr. 48
used
Current limit level at input voltage 10V/5V
(input current 20mA),
Set using Pr. 149.
Input voltage (V)
(5VDC/10V)
0 The second stall prevention operation is not
performed.
If the output frequency is equal to or less than the
frequency set in Pr. 49, the second stall prevention
function activates. (during constant speed or
deceleration)
The second stall prevention function is performed
according to the RT signal.
9999
*2
RT signal ON ... Stall level Pr. 48
RT signal OFF ... Stall level Pr. 22
⋅ Set Pr. 22 Stall prevention operation level to "9999".
⋅ 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.
⋅ 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 or 5V (20mA) in Pr. 149 Stall prevention level at
10V input
Operation
*1