Mitsubishi Electric MELDAS MDS-B-SVJ2 Series, Specifications And Instruction Manual, Page: 96 / 297

Chapter 4 Setup
4-4
4-2-2 Limitations to electronic gear setting value
The servo amplifier has internal electronic gears. The command value from the NC is converted into a
detector resolution unit to carry out position control. The electronic gears are single gear ratios
calculated from multiple parameters as shown below. However, each value (ELG1, ELG2) must be
less than 32767.
If the value overflows, the initial parameter error (alarm 37) or error parameter No. 101 (2301 with
M50/M64 Series NC) will be output.
If an alarm occurs, the mechanical specifications and electrical specifications must be revised so that
the electronic gears are within the specifications range.
Reduced fraction of
ELG1
ELG2
=
PC2
×
RANG
PC1
×
PIT
×
IUNIT
(reduced fraction)
RANG = RNG1 = RNG2
IUNIT = 2/NC command unit (
μ
m)
1
μ
m : IUNIT = 2, 0.1
μ
m: IUNIT = 20
When the above is calculated, the following conditions must be satisfied.
ELG1
≤
32767
ELG2
≤
32767
POINT
If the electronic gears in the amplifier overflow, the alarm 37 or error parameter
No. 101 (2301 with M50/M64 series NC) will be output.
4-2-3 Parameters set according to feedrate
The following parameters are determined according to each axis' feedrate.
No.
Abbrev.
Parameter name Explanation
SV023 OD1 Excessive error detection
width at servo ON
SV026 OD2 Excessive error detection
width during servo OFF
A protective function will activate if the error between the position
command and position feedback is excessive. If the machine load is
heavy and problems occur with the standard settings, gradually
increase the setting value.
<Calculation of standard setting value>
OD1 = OD2 =
Rapid traverse rate (mm/min)
60
×
PGN1
÷
2 (mm)
4-2-4 Parameters set according to machine load inertia
The following parameters are set according to the machine's inertia.
No. Abbrev. Parameter name Explanation
SV005 VGN1 Speed loop gain. Refer to the comparison graph with the load inertia scale for the
standard setting value.
SV008 VIA Speed loop lead
compensation Set 1364 as a standard. Set 1900 as a standard for the SHG control.
If the load inertia is large and is in the standard VIA change region, set
the value in the comparison graph regardless of whether normal control
or SHG control is used.