Mitsubishi Electric 800 Series Instruction Manual page 337

(H) Protective function parameter
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 Pr.115 setting
0 (initial value)
0.01 Hz to 590 Hz
9999 Setting not available


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.)
During acceleration
Pr.48 During deceleration/constant speed During deceleration/constant speed During deceleration/constant speed
Pr.114
Pr.49 Output frequency
Pr.115
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 (X9) signal acts as the second (third) function selection signal and makes the other second (third) functions valid.
(Refer to page
336
PARAMETERS
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)
Pr.49(Pr.115)
Set frequency
Stall
prevention
level
Pr.22 used
Set frequency is Pr.49(Pr.115) or less
419.)
Operation
Output
frequency
Pr.49(Pr.115)
Time
Stall
prevention
level
Pr.48(Pr.114) used
Set frequency exceeds Pr.49(Pr.115)
Output
Output
frequency (Hz)
frequency
Pr.22 used
Pr.48(Pr.114) used

Time