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8 PARAMETER FUNCTIONS
8-26
8.5.2 Acceleration time and deceleration time
Initial value
Pr. 7 "acceleration time" 5
Pr. 8 "deceleration time" 5
Pr. 20 "acceleration/deceleration reference speed" 2000
Pr. 21 "acceleration/deceleration time unit" 0
Pr. Pr. 21 Setting Range Unit
0 0.0 to 3600
7, 8
1 0.00 to 360.0
s
20 1 to 3000 r/min
In Pr. 7, set the time required to increase the speed from a start to the speed set in Pr. 20.
In Pr. 8, set the time required to decrease the speed from the speed set in Pr. 20 to a stop.
In Pr. 21, you can change the setting unit.
Pr. 7 Pr. 8
Pr. 20
Time
Speed
Running speed
Braking voltage or coasting to stop
Refer to: 8.5.4 Stopping operation
When the FR-DU04 operation panel is used, the minimum setting increments of the acceleration
and deceleration times vary with the acceleration and deceleration time settings.
Minimum Setting Increments
Pr.
Setting of less than
100
Setting between 100
and less than 1000
Setting of 1000 or
more
Unit
00.1 1
10.01
0.1
s
MEMO
The minimum value of acceleration/deceleration time is 0.08s. Any
acceleration/deceleration time setting of less than 0.08 is handled as 0.08s.
The upper limit of acceleration time at up to 100r/min is 5s (converted at reference
speed 2000r/min). When the acceleration time setting is greater than 5s, therefore,
the acceleration time required to reach the acceleration/deceleration reference
speed is represented by the following expression and is shorter than the preset
acceleration time:
Required acceleration time = 0.25 + T1
T1 = (preset speed command - 100)
×
Pr. 7 setting/Pr. 20 setting
The value less than the Pr. 10 setting will voltage-brake or coast the motor to a stop.
Therefore, the deceleration time required to decrease the speed from the speed set
in Pr. 20 to the speed set in Pr. 10 is as follows:
Required deceleration time = Pr. 8 setting
×
(Pr. 20 setting - Pr. 10 setting)/
Pr. 20 setting
A too short acceleration/deceleration time setting can cause an abnormal stop due
to overload, overcurrent or overvoltage. Make a setting which will not display
overload on the operation panel.
Rapid acceleration of less than 0.2s may make the starting torque insufficient.