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Setting of acceleration/deceleration time and acceleration/deceleration pattern
(2) Deceleration time setting (Pr.8, Pr.20)
Use Pr.8 Deceleration time to set the deceleration time required to reach 0r/min from Pr.20 Acceleration/deceleration reference
speed.
Set the deceleration time according to the following expression.
(3) Set two kinds of acceleration/deceleration times (RT signal, Pr.44, Pr.45, Pr.147 )
Pr.44 and Pr.45 are valid when the RT signal is ON, or the rotation speed reaches or exceeds the setting of Pr.147.
When "9999" is set to Pr.45, the deceleration time becomes equal to the acceleration time (Pr.44).
For the RT signal, set "3" in any of Pr.178 to Pr.184 (input terminal function selection) to assign the function.
Acceleration/deceleration time changes when the RT signal turns ON or the rotation speed reaches the Pr.147 setting or
higher.
(1) Acceleration time setting (Pr.7, Pr.20)
Use Pr.7 Acceleration time to set the acceleration time required to reach Pr.20
Acceleration/deceleration reference speed from 0r/min.
Set the acceleration time according to the following formula.
Acceleration
time setting
=
Pr.20
Acceleration time from
a stop to the maximum
operating speed
Maximum operating speed
Example) How to find the setting value for Pr.7 when increasing the rotation
speed to the maximum speed of 2500r/min in 10s with Pr.20 =
3000r/min (initial setting)
Pr.7 =
3000r/min
10s = 12s
2500r/min
Deceleration
time setting
=
Pr.20
Deceleration time from the maximum operating speed to a stop
Maximum operating speed - Pr.10*
For Pr.11 = "0". When Pr.11 "0", "-Pr.10" is not required.
Example) How to find the setting value for Pr.8 when decreasing the
rotation speed from the maximum speed of 2500r/min in 10s with
Pr.20 = 3000r/min, Pr.10 = 90r/min (initial setting) and Pr.11 = 0.
Pr.8 =
3000r/min
10s 12.5s
2500r/min - 90r/min
REMARKS
If the protective function (E.OLT) is activated due to insufficient torque in the low-speed range, set longer acceleration/
deceleration times in the low-speed range only by Pr.791 Acceleration time in low-speed range and Pr.792 Deceleration time in low-
speed range.
Pr.147 Setting Acceleration/Deceleration Time Description
9999 (initial value) Pr.7, Pr.8 No automatic switching of the acceleration/deceleration time
0r/min Pr.44, Pr.45 Second acceleration/deceleration time from a start
1r/min Pr.147 Set speed
Rotation speed < Pr.147: Pr.7, Pr.8
Pr.147 rotation speed: Pr.44, Pr.45
Acceleration/deceleration time automatic switching
Set speed < Pr.147 Pr.7, Pr.8
No automatic switching, since speed will not reach the
switching speed
When the RT signal turns on, the acceleration/deceleration time switches to the second acceleration/deceleration time even when the speed is not
reached to Pr.147 setting.
NOTE
Changing terminal assignment may affect the other functions. Set parameters after confirming the function of each
terminal.
Running
speed
Acceleration time Deceleration time
Time
Pr.20
(3000r/min)
Pr.7, Pr.44 Pr.8, Pr.45
Rotation
speed (r/min)
Time
Acceleration time Deceleration time
Rotation speed
(r/min)
Set
speed
Pr.147
setting
Slope set
by Pr.7
Slope set
by Pr.44
Slope set
by Pr.44
(Pr.45)
Slope set
by Pr.8