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Adjustment of the output torque (current) of the motor
4
PARAMETERS
(4) Set multiple stall prevention operation levels (Pr. 48, Pr. 49)
⋅ 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).
(5) Stall prevention operation level setting by terminal 1 (analog variable) (Pr. 148, Pr. 149)
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
set parameters 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 125)
⋅ 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
in Pr. 148 Stall prevention level at 0V input.
⋅ Set the current limit level at the input voltage of
10V or 5V in Pr. 149 Stall prevention level at 10V input
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.
Stall prevention
operation current
During acceleration
Running frequency
Pr.48
Pr.49
During deceleration/constant speed
During deceleration/constant speed
During deceleration/constant speed
Pr. 49 Setting Operation
0(initial value) The second stall prevention operation is not performed.
0.01Hz to 400Hz
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)
*1
9999
*2
The second stall prevention function is performed according to
the RT signal.
RT signal ON ... Stall level Pr. 48
RT signal OFF ... Stall level Pr. 22
*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.
(The second stall prevention operation level cannot be input in an analog form.)
Pr. 22
used
Output
frequency (Hz)
Output
frequency
Stall
prevention
level
Set
frequency
Time
Pr.49
Set frequency exceeds Pr. 49
Pr. 48
used
Pr. 22
used
Output
frequency (Hz)
Output
frequency
Set
frequency
Tim
e
Pr.49
Pr. 48
used
Set frequency is Pr. 49 or less
100%
50%
Current limit level (%)
(5VDC/10V)(-5VDC/10V)
Input voltage (V)
Current limit level at input voltage 10V/5V.
Set using Pr. 149.
Current limit level at input voltage 0V.
Set using Pr. 148.
0
120%
110%
Initial setting