Siemens SINUMERIK 840C Installation Instructions Manual page 366

01.99
NC MD 7
Quadrant
Adaptation
error comp-
1804*
(as from
ensation (as
SW 2)
from SW 2)
Standard value: 0000 0000
Bit 7 See Section entitled "Functional Descriptions"
Bit 6 See Section entitled "Functional Descriptions"
Bit 5 Bit 5=0 Axis cannot move against fixed stop.
Bit 5=1 Axis can move against fixed stop.
This bit must be set for any axis which is allowed to move against the fixed
stop.
Caution:
MD 1804*, bit 5, must only be set for real axes. It must not be set for fictitious
main and coupled-motion axes.
Bit 4 Bit 4=1 "Fixed stop reached" is sent to the NC via an external sensor.
Bit 4 Bit 4=0 "Fixed stop reached" is calculated internally by the servo from the following
error increase factor.
Bit 3 Bit 3=0 Zero speed monitoring for moving against fixed stop off
Bit 3=1 Zero speed monitoring for moving against fixed stop on
Bit 1 The function "Tacho compensation" is used to compensate for drive and
tacho characteristic errors which can occur with an analog coupling (e.g.
temperature problems). The function can also be used to correct incorrect
tacho settings. Deviations of up to 12.5 % of the multgain (setpoint
adaptation/maximum load speed) can be compensated (multgain adjustment).
The tacho compensation calculates a new compensation value if:
• a constant velocity is used for traversing and
• the velocity of the axis is greater than 6.25 % of the maximum velocity.
If one of these conditions is not fulfilled, the compensation value remains
constant at the last calculated value. If the compensation value exceeds 12.5
% of the set multgain, this limiting value is used for the compensation.
A separate compensation value is derived for each traversing direction in order
to be able to compensate for asymmetrical drive and tacho characteristics.
The function compensates for deviations of the real as compared to the
calculated ideal following error. To ensure following error-free movement, the
speed feed-forward control must be used with 100 % feedforward control
factor.
©
Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
Bit No.
6 5 4
Sensor
Axis can
signal PLC
travel
against fixed fixed stop
stop (as from
(as from
SW 3)
SW 3)
6FC5197- AA50
6.7.1 Axis-specific MD bits 2 (axial bits 2)
3 2 1
Monitoring
Automatic
clamping
tacho comp-
tolerance
ensation (as
act. (as from
from
SW 2)
SW 3)
0
Symmetrical
traversing
range
ENDAT
absolute
encoder (as
from SW 6)
6–181