Siemens SINUMERIK 840C - Manual (Page 251)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 09.95
6.5 Spindle-specific MD (spindle data)
in NC MD 403* and 0 in NC MD 404* to 410*. In the case of gear units with fewer than eight
gears, 0 should be entered for the non-existing gears (a value other than 0 for a non-existent
gear will cause the spindle to come to standstill).
Gear input signals (see Interface Description Part 2).
Note:
Gear stages not used must be assigned the value zero.
[rev/min]
1 2 3
[V]
Input values
Spindle speed for
each gear
Setpoint speed
10V
Gear:
Maximum spindle speed digital (as from SW 3) 403*-410*
Default value Lower input limit Upper input limit Units
500 - 4 000 0 100 000 rev/min or 0.1 rev/min
Active
at once
With these parameters it is then possible to achieve a very fine adjustment of the set speed
ratio (e.g. to the speed ratios of belt drives which are not always precisely known).
Minimum speed gear stages 1-8 411*-418*
Default value Lower input limit Upper input limit Units
see table +0 99 999 rev/min 1)
Active on
NC Stop
Assignment
Gear 1 2 3 4 5 6 7 8
NC MD 411* 412* 413* 414* 415* 416* 417* 418*
Default 50 500 1000 2000 2000 2000 2000 2000
By entering the minimum gear speeds, the gear-speed range is defined. On the basis of the
programmed spindle speed, the NC can now transfer the required gear and a request signal
for a gear change to the PLC. Should the speed ranges for the various gears overlap, the NC
choses the appropriate gear on the basis of the fewest number of gear changes required to
arrive at the required speed (selection by "Automatic gear selection").
_______
1) The input resolution is 0.1 rev/min, if MD 520* bit 3 = 1.
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SINUMERIK 840C (IA)