Mitsubishi Electric FR-A820-00046 Instruction Manual page 499

Parameters
Setting multiple stall prevention operation levels (Pr. 48, Pr. 49, Pr. 114, Pr. 115)
● By setting Pr. 49 "Second stall prevention operation frequency" = "9999" and turning ON the RT
signal, Pr. 48 "Second stall prevention operation level" will be enabled.
● For Pr. 48 (Pr. 114), set the stall prevention operation level that is effective in the output frequency
range between 0 Hz and Pr. 49 (Pr. 115). However, the operation level is Pr. 22 during acceleration.
● Stop-on-contact operation can be used by decreasing the Pr. 48 (Pr. 114) setting and loosening
the reduction torque (torque when stopped).
● Pr. 114 and Pr. 115 are enabled when the X9 signal is ON. To input the X9 signal, set "9" in any of
Pr. 178 to Pr. 189 (input terminal function selection) to assign the function to the terminal.
Pr. 49 setting
9999
Tab. 5-122: Settings of parameter 49 and 115
For the stall prevention operation level, the smaller of Pr. 22 and Pr. 48 (Pr. 115) has precedence.
When Pr. 858 = "4 (analog input to terminal 4 for stall prevention operation level)" or Pr. 868 = "4
(analog input to terminal 1 for stall prevention operation level)", turning ON the RT (X9) signal will
not enable the second (third) stall prevention function. (Input to the terminal 4 or terminal 1 is
valid.)
Pr. 48
Pr. 114
Fig. 5-143:
NOTES When Pr. 49 ≠ "9999" (level change according to frequency) and Pr. 48 = "0%", the stall prevention
function will be disabled at or lower than the frequency set in Pr. 49.
The RT signal is assigned to the terminal RT in the initial status. Set "3" in any of Pr. 178 to Pr. 189
(input terminal function selection) to assign the RT signal to another terminal.
Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may
affect the other functions. Set parameters after confirming the function of each terminal.
The RT (X9) signal acts as the second (third) function selection signal and makes the other second
(third) functions valid. (Refer to page 5-428.)
FR-A800
Pr. 115 setting
0 (initial value)
0.01 Hz to 590 Hz
Setting not available
During acceleration
Pr. 49 (Pr. 115)
Set frequency
During deceleration/constant speed
Pr. 49 Running frequency
Pr. 115
Stall prevention operation level setting example
Operation
The second (third) stall prevention function disabled.
The second (third) stall prevention function operates according to the
frequency.
The second stall prevention function operates according to the RT signal.
RT signal ON: stall level Pr. 48
RT signal OFF: stall level Pr. 22
Output
frequency (Hz)
Output
frequency
Time
Stall
prvention
level
Pr. 48 (Pr. 114) used
Pr. 22 used
Set frequency is Pr. 49 (Pr. 115) or less
(H) Protective function parameter
Output
frequency (Hz)
Output
frequency
Set frequency
Pr. 49 (Pr. 115)
Stall
prvention
Pr. 22 used
level
Pr. 48 (Pr. 114) used
Set frequency exceeds Pr. 49 (Pr. 115)
Time
I002599E
5 - 319