7. SERVO PARAMETERS
7.5 Supplement
II - 220
7.5.2 Electronic gears
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.2301 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.
<For semi-closed loop control>
ELG1
PC2
×RNG1
Reduced fraction of
ELG2
=
PC1
×PIT×IUNIT
(reduced fraction)
IUNIT = 2/NC command unit (
µm)
1
µm : IUNIT = 2, 0.1µm : IUNIT = 20
When the above is calculated, the following conditions must be satisfied.
ELG1
≤ 32767
ELG2
≤ 32767
<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
