Mitsubishi Electric MELDAS MDS-R Series - Limitations to Electronic Gear Setting Value

8. Setup
8 - 8
8-2-2 Limitations to electronic gear setting value
The servo drive unit 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
M60S/E60 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 specified range.
(1) For semi-closed loop control
ELG1
PC2×RNG1
Reduced fraction of
ELG2
=
PC1×PIT×IUNIT
(reduced fraction)
IUNIT = 2/NC command unit (m)
1m : IUNIT = 2, 0.1m : IUNIT = 20
When the above is calculated, the following conditions must be satisfied.
ELG1  32767
ELG2  32767
(2) For full-closed loop control
PGNX
PC2×RNG2×PGN1
Reduced fraction of
PGNY
=
PC1×RNG1×30
(reduced fraction)
When the above is calculated, the following conditions must be satisfied.
PGNX  32767
PGNY  32767
And,
PGNXsp
PC2×RNG2×PGN1sp
Reduced fraction of
PGNYsp
=
PC1×RNG1×30
(reduced fraction)
When the above is calculated, the following conditions must be satisfied.
PGNXsp  32767
PGNYsp  32767
POINT
If the electronic gear value in the drive unit overflows, alarm 37 or error
parameter No. 101 (2301 with M60S/E60 Series NC) will be output.
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