Chapter 4
Operation
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4.5.4 Soft Start
The soft start function converts the stepwise speed reference inside the servodrive to a consistent rate
of acceleration and deceleration.
Pn310 can be used to select the soft start form:
0: Slope; 1: S curve; 2: 1
st
-order filter; 3: 2
nd
-order filter
4.5.5 Speed Reference Filter Time Constant
4.5.6 S-curve Risetime
Pn306
Soft Start Acceleration Time
Setting
Setting
Setting
Setting Range
Range
Range
Range
Setting
Setting
Setting
Setting Unit
Unit
Unit
Unit
Factory
Factory
Factory
Factory Setting
Setting
Setting
Setting
Setting
Setting
Setting
Setting Validation
Validation
Validation
Validation
0
～
10000
1ms
0
Immediately
Pn307
Soft Start Deceleration Time
Setting
Setting
Setting
Setting Range
Range
Range
Range
Setting
Setting
Setting
Setting Unit
Unit
Unit
Unit
Factory
Factory
Factory
Factory Setting
Setting
Setting
Setting
Setting
Setting
Setting
Setting Validation
Validation
Validation
Validation
0
～
10000
1ms
0
Immediately
The soft start function enables smooth speed control when inputting a stepwise speed reference or
when selecting internally set speeds. Set both Pn306 and Pn307 to “0” for normal speed control.
Set these parameters as follows:
· Pn306
：
The time interval from the time the servomotor starts until the servomotor maximum
speed is reached.
· Pn307
：
The time interval from the time the servomotor is operating at the servomotor maximum
speed until it stops.
Before soft start
Before soft start
Before soft start
Before soft start
After soft start
After soft start
After soft start
After soft start
Servom otor m axim um speed
Servom otor m axim um speed
Servom otor m axim um speed
Servom otor m axim um speed
P n
P n
P n
P n 3 0 6
3 0 6
3 0 6
3 0 6
P n
P n
P n
P n 3 0 7
3 0 7
3 0 7
3 0 7
Pn308
Speed Reference Filter Time Constant
Setting
Setting
Setting
Setting Range
Range
Range
Range
Setting
Setting
Setting
Setting Unit
Unit
Unit
Unit
Factory
Factory
Factory
Factory Setting
Setting
Setting
Setting
Setting
Setting
Setting
Setting Validation
Validation
Validation
Validation
0
～
10000
1ms
0
Immediately
This smoothens the speed reference by applying a 1
st
–order delay filter to the analog speed reference
(V-REF) input. A value that is too large, however, will slow down response.
Pn309
S-curve Risetime
Setting
Setting
Setting
Setting Range
Range
Range
Range
Setting
Setting
Setting
Setting Unit
Unit
Unit
Unit
Factory
Factory
Factory
Factory Setting
Setting
Setting
Setting
Setting
Setting
Setting
Setting Validation
Validation
Validation
Validation
0
～
10000
1ms
0
Immediately
Speed
Speed
Speed
Speed
