Siemens SINUMERIK 840C Installation Instructions Manual page 712

10 Axis and Spindle Installation
10.4.1 Drive optimization
Example (for analog):
"V " = 300 mm/min
max
"U " = 9000 mV
max
Example of a linear axis
Input/display resolution
Position control resolution
Rated motor speed
or FDD MD 1400
Spindle pitch
Gear (spindle motor)
Required max. setpoint
Max. velocity
MD 256*, Scaling factor
maximum velocity
MD 260*, Scaling factor
maximum speed setpoint
MD 280*, Maximum velocity
(progr. rapid traverse G00)
FDD MD 1147 speed
limitation
A speed setpoint of 7730 VELOS or 9500 [0.01 %] results in rapid traverse. The converted
value of 9436 or 9500 is entered in MD 260* (for analog only).
Maximum speed setpoint
The maximum value to be output as the speed setpoint is defined with MD 268*, maximum
speed setpoint. If the limit is exceeded, alarm 104*, "DAC monitor has responded" is triggered.
The internal speed setpoint is also monitored. If the speed setpoint set is too high, alarm 156*,
"Speed setpoint alarm limit activated", is triggered.
The alarms appear when the tacho compensation (for analog only) has not been carried out
correctly or there is a measuring circuit or drive error.
For axes whose maximum velocity is reached at approx. 9 V, for analog, or 100%, for digital,
the standard values can be used for the machine data.
Matching is necessary when the maximum velocity is reached at a low speed setpoint voltage.
This applies to axes for which the theoretical maximum velocity has to be limited for
mechanical reasons, e.g. pulse encoder.
The tacho compensation must be set to the desired maximum speed setpoint. This speed
setpoint must be entered in MD 268* taking account of the control margin of 5 - 10%. For
MD 264*, a value that is 20% higher than that for MD 268* is selected.
10–22
MD 256* = 3000 or 6000 with SW 3
MD 260* = 90000 or 18000 with SW 3
for analog
-4
IS = 10 inch
-3
MS = 0.5 · 10
rev
n = 3000 /
min
mm
s = 10 /
rev
r = 1 : 2 = 0.5
U = 9.5 V
V [mm] = n · S · r
max
V [mm] = 3000 rev / · 10
max min
mm
V [mm] = 15000 /
max min
mm
V [inch] = 15000 /
max min
inch
= 590.55 /
min
mm
15 000 [ / ]
min
9 500 [mV] or [0.01 %]
5 900 [1000 · 10-4
inch/min]
––
© Siemens AG 1992 All Rights Reserved
for digital
mm
as for analog
mm / · 0,5
rev
as for analog
mm
: 25.4 /
inch
inch
590 /
min
mm
15 000 [ /
min
10 000 [mV] or [0.01 %]
5 900 [1000 · 10
3 300
SINUMERIK 840C (IA)
09.95
]
-4 inch
/ ]
min
6FC5197- AA50