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9. Adjustment 
 
 
 
 
 
9 - 26
9-3-6  Improvement of characteristics during acceleration/deceleration 
 
(1)  SHG control (option function) 
 
Because SHG control has a smoother response during acceleration/deceleration than conventional 
position controls, the acceleration/deceleration torque (current FB) has more ideal output 
characteristics. (A constant torque is output during acceleration/deceleration.) The peak torque is kept 
low by the same acceleration/deceleration time constant, enabling the time constant to be shortened.  
 
Refer to item "(3) SHG control" in section "9-2-3 Position loop gain" for details on setting SHG control.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
0
 
0
 
3000
 
200
 
-200
 
-3000
 
Time
 
Time
 
Speed command 
(r/min)
 
Current FB  
(stall current%)
 
 
 
Acceleration/deceleration characteristics during conventional control
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
0
 
0
 
3000
 
200
 
-200
 
-3000
 
Time
 
Time
 
Speed command 
(r/min)
 
Current FB  
(stall current %)
 
 
 
Acceleration/deceleration characteristics during SHG control
 
 
 
No. Abbrev. 
Parameter 
name 
Setting 
ratio
Setting example 
Explanation 
Setting 
range
SV003 
(SV049) 
PGN1 
(PGN1sp) 
Position loop gain 1 
23
26
33
38
47
1 to 200
SV004 
(SV050) 
PGN2 
(PGN2sp) 
Position loop gain 2 
 
8
3  
62
70
86 102 125
0 to 999
SV057 
(SV058) 
SHGC 
(SHGCsp) 
SHG control gain 
140 160 187 225 281
Always set a combination of 3 parameters.
0 to 1200
SV008 VIA 
Speed loop lead 
compensation 
Set 1900 as a standard value during SHG control. 
1 to 9999
SV015 FFC 
Acceleration rate 
feed forward gain 
Set 100 as a standard value during SHG control. 
0 to 999
 
 
 
POINT
 
SHG control is an optional function. If the option setting is not provided with the 
NC, alarm 37 (at power ON), warning E4, or error parameter No. 104 (2304 for 
M60S/E60 Series NC) will be output.