Mitsubishi Electric 800 Series Instruction Manual page 274

(F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
Setting the acceleration/deceleration time in the low-speed range
(Pr.791, Pr.792)
• If torque is required in the low-speed range (less than 10% of the rated motor frequency) under PM sensorless vector
control, set the Pr.791 Acceleration time in low-speed range and Pr.792 Deceleration time in low-speed range
settings higher than the Pr.7 Acceleration time and Pr.8 Deceleration time settings so that the mild acceleration/
deceleration is performed in the low-speed range. (When RT signal or X9 signal is turned ON, the second or third
acceleration/deceleration time setting is prioritized.)
Acceleration time
in low-speed range
Slope set by Pr. 791
NOTE
• Set Pr.791 higher than Pr.7, and Pr.792 higher than Pr.8. If set as Pr.791 < Pr.7, the operation is performed as Pr.791 = Pr.7.
If set as Pr.792 < Pr.8, the operation is performed as Pr.792 = Pr.8.
Emergency stop function (Pr.1103)
• When the Emergency stop (X92) signal is ON, the deceleration stop is performed according to the settings in the Pr.1103
Deceleration time at emergency stop and Pr.815 Torque limit level 2.
• To input the X92 signal, set "92" in any of Pr.178 to Pr.189 (Input terminal function selection) to assign the function to a
terminal.
• The X92 signal is a normally closed input (NC contact input).
• [PS] is displayed on the operation panel during activation of the emergency stop function.
• The droop control and the speed loop integration at the emergency stop by the Emergency stop (X92) signal can be
enabled/disabled using Pr.1349 Emergency stop operation selection.
Pr.1349
setting
Droop control
0 Enabled
1 Enabled
10 Disabled
11 Disabled
NOTE
• The X92 signals can be assigned to an input terminal by setting Pr.178 to Pr.189 (Input terminal function selection).
Changing the terminal assignment may affect other functions. Set parameters after confirming the function of each terminal.
• Refer to page 621
• Refer to page 164
Acceleration time
Slope set by Pr.7
Output frequency
Start signal
X92
OFF
Description
Speed loop integration
Enabled
Disabled
Enabled
Disabled
for details of the droop control.
for details of the speed loop integration.
Low-speed range
(rated motor frequency/10)
Time
Deceleration time
in low-speed range
Slope set by Pr.792
Deceleration time
Slope set by Pr.8
Deceleration
by an emergency stop
Normal
acceleration
Time
ON OFF ON
ON OFF
273
PARAMETERS
5
GROUP
F