Mitsubishi Electric FR-F800 Series Instruction Manual page 296

 Setting multiple stall prevention operation levels (Pr.48,
Pr.49)
• Setting Pr.49 Second stall prevention operation frequency = "9999" and turning ON the RT signal enables Pr.48
Second stall prevention operation level.
• 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.
Pr.49 setting
0 (initial value)
0.01 Hz to 590 Hz
*2
9999
*1 For the stall prevention operation level, the smaller of Pr.22 and Pr.48 has precedence.
*2 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 does 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.114
Pr.49
Pr.115
NOTE
• When Pr.49 ≠ "9999" (level change according to frequency) and Pr.48 = 0%, the stall prevention function is 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 one 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 is the Second function selection signal. The RT signal also enables other second functions. (Refer to
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Magnetic flux Magnetic flux Magnetic flux
V/F V/F V/F
The second stall prevention function disabled.
The second stall prevention function operates according to the frequency.
The second stall prevention function operates according to the RT signal.
RT signal ON: stall level set in Pr.48
RT signal OFF: stall level set in Pr.22
Output
frequency (Hz)
Pr.49(Pr.115)
Set frequency
Stall
prevention
level
Output frequency
Pr.22 used
Set frequency is Pr.49(Pr.115) or less
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Operation
Output
frequency (Hz)
Output
frequency
Pr.49(Pr.115)
Time
Stall
prevention
level
Pr.48(Pr.114) used
Set frequency exceeds Pr.49(Pr.115)
*1
Output
frequency
Time
Pr.22 used
Pr.48(Pr.114) used
page
5. PARAMETERS
5.7 (H) Protective function parameter
1
2
3
4
5
6
7
8
9
10
377.)
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