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4 Setup
MITSUBISHI CNC
4.2.1 Setting of Servo Specification Parameters
(1) Basic specification parameters
When performing absolute position control, set the axis specification parameter #2049. When the setting value of
#2049 is "1 to 4", "SV017/bit7" is automatically set to the absolute position control.
It is not possible to set SV017/bit7 directly.
【#2049(PR)】 type Absolute position detection method
Select the absolute position zero point alignment method.
0: Not absolute position detection (Incremental control)
1: Stopper method (push against mechanical stopper)
2: Marked point alignment method I (The grid point is the reference position.)
3: Dog-type (align with dog and near point detection switch)
4: Marked point alignment method II
(The position with which the mark was aligned is the reference position.)
9: Simple absolute position (Not absolute position detection, but the position when the power is
turned off is registered.)
【#2217(PR)】 SV017 SPEC1 Servo specification 1
bit 7 : abs Position control
These parameters are set automatically by the NC system.
0: Incremental 1: Absolute position control
For C70 NC, set the following parameters. Ignore the unnecessary alarm history which occurs when the NC power
is turned off.
【#2314】 SV114 SSF9 Servo function 9
bit 8 : nohis History of communication error alarm between NC and DRV (34, 36, 38, 39)
Set "1" for C70.
0: Enable 1: Disable
(2) Electronic gear related parameters
Servo control is performed by changing NC command unit to servo control unit with the following parameters
(electric gear). Even if each parameter is within the setting range, overflow of the electric gear coefficient may be
occur. When the overflow of the electric gear occurs, initial parameter error (servo alarm 37) will occur.
【#2201(PR)】 SV001 PC1 Motor side gear ratio
【#2202(PR)】 SV002 PC2 Machine side gear ratio
Set the gear ratio in the machine side when there is the gear between the servo motor's shaft and
machine (ball screw, etc.).
For the rotary axis, set the total deceleration (acceleration) ratio.
Even if the gear ratio is within the setting range, the electronic gears may overflow and an initial
parameter error (servo alarm 37) may occur.
【#2218(PR)】 SV018 PIT Ball screw pitch/Magnetic pole pitch
Set the ball screw pitch. For the rotary axis, set to "360".
【#2219(PR)】 SV019 RNG1 Sub side encoder resolution
Set the same value as SV020.
For the full-closed loop control, refer to "Setting of Machine Side Encoder".