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6 Spindle Adjustment
MITSUBISHI CNC
[1] Drive unit operation mode can be selected with the bit correspondences below.
[2] Mode changeover is valid during in-position (INP=1) or other than during droop cancel / phase
compensation (DCSL=PCMP=0).
(Note) When selecting bits other than above, control mode error (4E) occurs.
[3] Continuity cannot be guaranteed for the value of position FB in non-interpolation mode. (Position may be
skipped for multiple rotations due to droop cancel or phase compensation.)
bit4. In gear changeover command (GKC)
By inputting GKC=1, the gear ratio is changed to the gear ratio specified with the gear selection command
(GR1, GR2). This command is invalid during the interpolation mode.
bit5. Gear selection command 1 (GR1)
bit6. Gear selection command 2 (GR2)
[1] The following 4 types of gear ratio are available depending on GR1 and GR2 2-bit input combinations.
[2] Gear specifications in semi-closed position control do not secure a position within one rotation of the
spindle.
bitC. M coil selection command (MCS) (IPM spindle motor only)
[1] M coil is selected at MCS=1 when 3-step coil changeover is valid.
[2] Signal change is invalid during interpolation mode, but coil changeover is valid if control mode
changeover is applied together.
bitD. L coil selection command (LCS)
[1] L coil is selected at LCS=1 when coil changeover is valid.
[2] Signal change is invalid during interpolation mode, but coil changeover is valid if control mode
changeover is applied together.
bitE. Sub-motor selection command (MS)
When 1 drive unit 2 motor function is valid, a main motor is selected at MS=0 and a sub-motor is selected at
MS=1. An input cannot be changed during motor changeover.
(Note) The bits other than those above are used for maintenance.
SC3 SC2 SC1
Operation mode
Conventional method New method
0 0 0 Speed/orientation control Non interpolation control
0 0 1 Spindle synchronization Spindle synchronization
0 1 0 C-axis control
Interpolation control
1 0 0 Synchronous tapping control
GR2 GR1 Parameters requiring gear ratio setting
0 0 SP057 (GRA1), SP061 (GRB1)
0 1 SP058 (GRA2), SP062 (GRB2)
1 0 SP059 (GRA3), SP063 (GRB3)
1 1 SP060 (GRA4), SP064 (GRB4)