Setting Multiple Stall Prevention Operation Levels (Pr.48, Pr.49) - Mitsubishi Electric FR-F800 Instruction Manual

(H) Protective function parameter
Setting multiple stall prevention operation levels (Pr.48, Pr.49)
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
• 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, set the stall prevention operation level that is effective in the output frequency range between 0 Hz and Pr.49.
However, the operation level is Pr.22 during acceleration.
• Stop-on-contact operation can be used by decreasing the Pr.48 setting and loosening the reduction torque (torque when
stopped).
Pr.49 setting
0 (initial value) The second stall prevention function disabled.
0.01 Hz to 590 Hz The second stall prevention function operates according to the frequency.
The second stall prevention function operates according to the RT signal.
9999 RT signal ON: stall level Pr.48

RT signal OFF: stall level Pr.22

For the stall prevention operation level, the smaller of Pr.22 and Pr.48 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 signal will not enable the second stall prevention function. (Input to the terminal 4 or terminal 1 is valid.)
During acceleration
Pr.48 During deceleration/constant speed During deceleration/constant speed During deceleration/constant speed
Pr.49 Running frequency
NOTE
• 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 signal acts as the second function selection signal and makes the other second functions valid. (Refer to
252
PARAMETERS
Operation
Output
frequency (Hz)
Pr.49
Set frequency
Stall
prevention
level
Pr.22 used Pr.48 used
Set frequency is Pr.49 or less
Output
frequency (Hz)
Output
frequency
Pr.49
Time
Stall
prevention
level

Output
frequency
Time
Pr.22 used
Pr.48 used
Set frequency exceeds Pr.49
page 333.)