Siemens SINUMERIK 840C - Manual (Page 713)

09.95 10 Axis and Spindle Installation
10.4.1 Drive optimization
n
set
= speed setpoint in [VELO], [0.01%] or [ mm /
min
]
MD 268* Max. speed setpoint
MD 264* Threshold for drive error
MD 280* Max. velocity
(progr. rapid traverse G00)
MD 288* Conv. feedrate
MD 292* Conv. rapid traverse
t
[sec]
n
set
20%
5%
Example:
Overdimensioned drive for a rotary axis (analog)
Input resolution : IS = 10 -3 degrees
Position control resolution : MS = 10 -3 degrees
Motor speed : n = 3000 rev /
min
Gear (axis motor) : r = 1 :10
Max. velocity : V
max
= n · r · 360 [ degrees /
min
]
= 108000 degrees /
min
= 300 rev /
min
Set max. velocity
for axis
: = 54000 degrees /
min
= 150 rev /
min
The following machine data result
MD 256*, scaling factor maximum velocity: 54000 [ degrees /
min
]
MD 260*, scaling factor maximum speed setpoint: 5000 [mV] [0.01%]
MD 280*, maximum velocity (progr. rapid traverse G00): 54000 [1000 · 10 -3 degr. /
min
]
MD 268*, maximum speed setpoint:
MD 268*, MD 260* · 0.8192 + 5% =
4300 [VELO] or 5250 [0.01%]
MD 264*, threshold for drive errors:
MD 264*, MD 268* + 20% =
5160 [VELO] or 6300 [0.01%]
Caution: The low speed setpoint has an adverse effect on the control
behaviour of the axis.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 10–23
SINUMERIK 840C (IA)