Siemens SINUMERIK 840C Installation Instructions Manual page 743

09.95
In view of the fact that not all spindle drives are equipped with ramp-function generators, a
ramp-function generator was integrated in the control (unit 1 ms). The following enable signals
are required for spindle setpoint output:
DB 31 Spindle-specific signals
• DL
• DL
• DW
• Setting data
Note:
See also functional description "Parameter set switchover" in Section 12.
Data required
This section describes the data that is of particular significance to the open-loop control mode.
• Limiting the speed
Parameters for maximum and minimum speed limits can be assigned for each gear ratio.
Parameter assignment is effected through the machine data:
–
–
If a gear stage is not used, the value zero must be entered for the maximum speed of this
gear stage and not the value in the standard machine data.
Regardless of which gear ratio is active, the speed is limited by:
–
–
–
–
• Limiting the acceleration
In order to avoid excessive acceleration when changing speeds, the setpoint is ramped up
or down accordingly by means of a ramp-function generator. The maximum value of
acceleration to be used is assigned by means of an acceleration time constant. A
separate acceleration time constant must be specified for each gear ratio employed:
–
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
More user manuals on
+ bit 6= 1 "Servo enable"
K 1
+ bit 5= 0 "Default setpoint is 0"
K 1
+ all bits= 0 "Spindle disable"
K 3
"Spindle speed limitation"
MD 403* to 410* "Max. speed" per gear ratio
MD 411* to 418* "Min. speed" per gear ratio
MD 451* "Max. chuck speed"
MD 448* "Min. motor speed"
SD 401* "Programmable spindle speed limit for G96"; programmed with
G92
SD 403* "Programmable spindle speed limit"; programmed with G26
MD 419* to 426* "Acceleration time constant without position control"
ManualsBase.com
6FC5197- AA50
10 Axis and Spindle Installation
10.5.1 Open-loop control mode
10–53