Setting The Acceleration/Deceleration Time In The Low-Speed Range; Emergency Stop Function - Mitsubishi FR-A800 Instruction Manual

(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. Such a setting is especially effective when the low-speed range high-
torque characteristic is disabled (Pr.788="0"). (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.
• Refer to page 694
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.
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.
Parameters referred to ???????
Pr.3 Base frequency page 598
Pr.10 DC injection brake operation frequency
Pr.29 Acceleration/deceleration pattern selection
Pr.125, Pr.126 (frequency setting gain frequency)
Pr.178 to Pr.182 (input terminal function selection)
Pr.264 Power-failure deceleration time 1, Pr.265 Power-failure deceleration time 2
Acceleration time
Slope set by Pr.7
for the rated motor frequency of MM-CF.
Output frequency
Start signal
X92
ON
page 605
page 290
page 415
page 430
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
OFF ON
page 540
289
PARAMETERS
5
GROUP
F