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3. Setup
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3-4 Restrictions on servo control
There may be some restrictions on mechanical specifications and electrical specifications when
executing servo controls. Always read this section when designing machines and confirm that no
problems exist with the specifications.
3-4-1 Restrictions of 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, and each value (ELG1, ELG2) must be 32767 or
less.
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 (such as resolution of the
detector) must be revised so that the electronic gears are within the specifications range.
(1) For semi-closed loop control
ELG1
PC2×RNG1
Reduced fraction of
ELG2
=
PC1×PIT×IUNIT
(reduced fraction)
IUNIT = 2/NC command unit (µm)
1µm : IUNIT = 2, 0.1µm : 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 gears overflow, the alarm 37 or error parameter No. 101 (2301
with M60S/E60 series NC) will be output.