Mitsubishi Electric 800 Series Instruction Manual (Function page 155

NOTE
• The second acceleration/deceleration time can be set.
• When speed limit command exceeds Pr.1 Maximum frequency setting, the speed limit value becomes Pr.1 setting. When
speed limit command falls below Pr.2 Minimum frequency setting, the speed limit value becomes Pr.2 setting. Also, the
speed limit command is smaller than Pr. 13 Starting frequency, the speed limit value becomes 0 Hz.
• To use analog inputs to perform speed limit, calibrate analog input terminals 2 and 4. (Refer to
• To use analog inputs to perform speed limit, turn OFF the external signals (RH, RM, RL). If any of the external signals (RH,
RM, RL) is ON, speed limit by multi-speed are enabled.
 Speed limit by parameters (Pr.807 = "1")
• Following the polarity change in the torque command, the polarity of the speed limit value changes. This prevents the
speed from increasing in the torque polarity direction. (When the torque command value is 0, the polarity of the speed limit
value is positive.)
• When Pr.807 Speed limit selection = "0", the setting during speed control is applied for the speed limit. When Pr.807
Speed limit selection = "1", Pr.808 Speed limit is applied for the speed limit.
• When the load has reversed the rotation opposite to the torque polarity, the setting of Pr.809 Reverse-side speed limit
is applied for the speed limit. (The speed limit value and reverse-side speed limit value are limited at Pr.1 Maximum
frequency.)
Reverse-side
speed limit value
-Pr.809
-Speed limit value
Rotation speed
Speed limit value
-Pr.809
Reverse-side
speed limit value
Start signal
When the torque command value is positive
NOTE
• During the speed limit operation, "SL" is displayed on the operation panel and the OL signal is output.
• For the OL signal, set "3" (positive logic) or "103" (negative logic) in one of Pr.190 to Pr.196 (Output terminal function
selection) to assign the function to the output terminal. Changing the terminal assignment using Pr.190 to Pr.196 may affect
the other functions. Set parameters after confirming the function of each terminal.
Parameters referred to
Pr.1 Maximum frequency, Pr.2 Minimum
Pr.4 to Pr.6, Pr.24 to Pr.27, Pr.232 to Pr.239 (multi-speed
Pr.7 Acceleration time, Pr.8 Deceleration
Pr.13 Starting frequencypage 244
Pr.190 to Pr.196 (Output terminal function
154
6. Torque Control
6.5 Speed limit
Torque
command
value
Speed limit value
Range where torque
control is available
Reverse-side
speed limit value
Pr.809
Range where torque
control is available
Pr.7
OFF ON
frequencypage 292
operation)page 273
timepage 232
selection)page 332
Rotation speed
Rotation speed
Pr.809
Pr.8
Reverse-side
speed limit value
Time
Speed limit value
Start signal
When the torque command value is negative
page 358.)
Range where torque
control is available
Pr.7
OFF ON
Time
Pr.8