Siemens SINUMERIK 840Di Function Manual page 1508

Detailed Description
2.1 Spindle modes
• A spindle position actual-value sensor is an essential requirement for M3/M4/M5 in
Position control ON/OFF
The spindle can be operated with or without position control:
SPCON
SPCOF
Speed control mode
Speed control mode is particularly suitable if a constant spindle speed is required, but the
position of the spindle is not important (e.g., constant milling speed for even appearance of
the workpiece surface).
• Speed control mode is activated in the part program with M3, M4, M5 or with SPCOF.
• NC/PLC IS:
• NC/PLC IS:
• Acceleration in speed control mode is defined independent of the gear step in machine
DB31, ... DBX61.5 (position controller active)
Position control is particularly suitable if the position of the spindle needs to be tracked over
a longer period or if synchronous spindle setpoint value linkage is to be activated.
• Position control mode is activated in the part program with SPCON (spindle number).
• NC/PLC IS:
• Acceleration in position control mode is defined independent of the gear step in machine
2-4
connection with:
– Revolutional feedrate (G95)
– Constant cutting rate (G96, G961, G97, G971)
– Thread cutting (G33, G34, G35)
– Tapping (G331, G332)
– Activate position control (SPCON, M70)
(Position control ON)
(Position control OFF)
DB31, ... DBX84.7 (open-loop control mode)
is set.
DB31, ... DBX61.5 (Position controller active)
is reset if position control is not used.
data:
MD35200 $MA_GEAR_STEP_SPEEDCTRL_ACCEL
and should, whenever possible, correspond to the physical properties.
DB31, ... DBX61.5 (position controller active)
is set.
data:
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL.
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Spindles (S1)