Mitsubishi Electric 800 Series Instruction Manual page 194

 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 motor 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 is turned ON, the second 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, Pr.815)
• When a fault occurs in the superordinate controller, the motor can be decelerated by the signal input via an external
terminal.
• The motor will decelerate to stop according to the settings of Pr.1103 Deceleration time at emergency stop and Pr.815
Torque limit level 2 when the Emergency stop (X92) signal is turned OFF (when the contact is opened).
• 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.
Deceleration
by an emergency stop
Output frequency
Start signal
ON
*1
X92
ON OFF
*1 ON/OFF indicates the input status of the physical terminal.
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
page 539
Pr.3 Base frequency
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.189 (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
Normal
acceleration
Time
OFF ON
ON
page 546
page 194
page 328
page 343
5.5 (F) Setting of acceleration/deceleration time and acceleration/deceleration pattern
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
page 458
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5. PARAMETERS