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Setting of acceleration/deceleration time and acceleration/deceleration pattern
4
PARAMETERS
(4) Faulty acceleration rate detection (Pr.375)
When the acceleration rate of the motor rotation speed is increased, such as when the machine collides against a foreign
object, the drive unit can cause the acceleration rate error (E.OA) to trip. The rotation speed calculated inside the drive
unit is used as the motor rotation speed.
Set Pr.375 Faulty acceleration rate detection level much larger than the acceleration/deceleration slope. If the setting of
Pr.375 Faulty acceleration rate detection level is lower than the acceleration/deceleration slope, the acceleration rate error
(E.OA) occurs even during normal operation.
If rapid acceleration/deceleration is set for normal operation and the acceleration rate error (E.OA) occurs, the
acceleration rate error detection cannot be used. Set Pr.375 = "9999" to disable the acceleration rate error detection.
(5) Setting the acceleration/deceleration time in the low-speed range (Pr.791, Pr.792 )
If torque is required in a low-speed range at 300 r/min or lower (600 r/min or lower for driving MM-GKR13), set 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 only in the low-speed
range.
If torque is required in the low-speed range (600r/min or less), set 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.
Set the time for the acceleration from a stop to Pr.20 Acceleration/deceleration reference speed as the acceleration time. Set
the time for the deceleration from Pr.20 Acceleration/deceleration reference speed to a stop as the deceleration time.
REMARKS
The RT signal acts as the second function selection signal and makes the other second function valid. (Refer to page 141) )
If the Pr.20 setting is changed, the Pr.125 and Pr.126 (speed setting signal gain speed) settings do not change. Set Pr.125 and Pr.126
to adjust the gains.
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.
If the acceleration/deceleration time is set, the actual motor acceleration/deceleration time cannot be made shorter than the
shortest acceleration/deceleration time determined by the mechanical system J (moment of inertia) and motor torque.
Rotation speed
(r/min)
A
cceleration rate
(r/min/ms)
Fault output
0
Time
0
Speed command
Rotation speed
Time
E.OA
E.OA
Pr.375
Pr.375
E.OA
Low-speed range
Acceleration time
Slope set by Pr.7
Deceleration time
Slope set by Pr.8
Deceleration time
in low-speed range
Slope set by Pr.792
A
cceleration time
in low-speed range
Slope set by Pr.791
Time
Rotation
speed (r/min)