Mitsubishi MELDAS HS Series Specifications And Instruction Manual page 79

<Maximum current command value>
For the maximum current command value during acceleration/deceleration, the maximum
current command value (MAXcmd) for one second is output to MAX current 1 and MAX current 2
on the CNC servo monitor screen and observed.
The meaning of the display for MAX current 1 and MAX current 2 will differ according to the
parameter settings.
No. Abbrev. Parameter name
SV034 SSF3 Special servo function
selection 3
(3) Adjusting the in-position width
Because there is a response delay in the servomotor drive due to position loop control, a "settling time"
is also required for the motor to actually stop after the command speed from the CNC reaches 0.
The movement command in the next block is generally started after it is confirmed that the
machine has entered the "in-position width" range set for the machine.
The in-position width is effective even when the standard servo parameters are set. However, it
may follow the CNC parameters, so refer to the CNC Instruction Manual for the setting.
No. Abbrev. Parameter name
SV024 INP In-position detection
width
POINT
(4) Adjusting the settling time
The settling time is the time required for
the position droop to enter the in-position
width after the feed command (F ⊿T) from
the CNC reaches 0.
The settling time can be shortened by
raising the position loop gain or using SHG
control. However, a sufficient response
(sufficiently large VNG1 setting) for the
speed loop is required to carry out stable
control.
The settling time during normal control
when the CNC
acceleration/
calculated using the following equation.
During SHG control, estimate the settling
time by multiplying PGN1 by
Settling time (msec) = −
Chapter 8 Adjustment
The display data for the maximum current value on the servo monitor is determined
with the following parameter.
15
bit
0 mon
Unit
µm
Set 50 as a standard.
Set the precision required for the machine.
The in-position width setting and confirmation availability depend on the CNC
parameters
is set to linear
deceleration can
2 .
l
3
10
×
n
PGN1
Explanation
14 13 12 11 10 9
Monitor Meaning when 0 is set
Maximum current command
MAX
value after power is turned
current 1
ON
Maximum current
MAX
com-mand value for one
current 2
second
Explanation
F
F∆T
0
Position
droop
0
be
F × 10
6
60 × G0tL × PGN1
2
PGN1 : Position loop gain1 (SV003)
F : Rapid traverse rate
G0tL : Rapid traverse linear acceleration/
deceleration time constant
8–11
8 7 6 5 4 3
daf2 daf1 dac2 dac1
Meaning when 1 is set
Maximum current command
value for one second
Maximum current FB value
for one second
Setting range
Settling time
G0tL
In-position width
INP
× 1 − exp − PGN1 × G0tL
10
(rad/sec)
(mm/min)
(msec)
2 1 0
mon
0 to 32767
Time
In-position
3