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3 Setup
MITSUBISHI CNC
(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 servomotor'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 detector resolution
Set the same value as SV020.
For the full-closed loop control, refer to "3-2-2 Setting of machine side detector".
【#2220(PR)】 SV020 RNG2 Main side detector resolution
Set the number of pulses per revolution of the motor side detector.
OSA18 (-A48), HF-KP(260,000 p/rev) ------- SV020 = 260
OSA105 (-A51) (1,000,000 p/rev) ------------ SV020 = 1000
(3) Setting of regenerative resistor type
Set the regenerative resistor type according to the connected regenerative resistor.
【#2236(PR)】 SV036 PTYP Regenerative resistory type
Some combinations are restricted according to the drive unit's capacity.
When the external option regenerative resistor is not connected, always use the built-in resistor in
the drive unit.
Resistor built-in drive unit : 1000h
MR-RB032 : 1200h
MR-RB12 or GZG200W39OHMK : 1300h
MR-RB32 or GZG200W120OHMK 3 units connected in parallel : 1400h
MR-RB30 or GZG200W39OHMK 3 units connected in parallel : 1500h
MR-RB50 or GZG300W39OHMK 3 units connected in parallel : 1600h
MR-RB31 or GZG200W20OHMK 3 units connected in parallel : 1700h
MR-MB51 or GZG300W20OHMK 3 units connected in parallel : 1800h
FCUA-RB22 : 2400h
FCUA-RB37 : 2500h
FCUA-RB55 : 2600h
R-UNIT2 : 2900h
FCUA-RB55 2 units connected in parallel : 2E00h
FCUA-RB75/2 2 units connected in parallel : 2D00h