Siemens SINUMERIK 802C Manual page 84

Start-Up
4.7 Commissioning
Activation
The backlash compensation is active in all operating modes only after referencing.
Leadscrew error compensation (LEC)
Overview
The compensation values are determined by means of the measured error curve and entered
in the control system using special system variables during start-up. The compensation tables
(cf. Technical Manual "Description of Functions") must be created in the form of NC programs.
Function
The leadscrew error compensation (LEC) changes the axis-specific actual position by the as-
sociated compensation value.
If the compensation values are too high, an alarm message can be output (e.g. contour moni-
toring, speed setpoint limitation).
Activation
The LEC is only activated in all operating modes if the following requirements are met:
S
The number of compensation intermediate points must be defined. They are only active
after Power ON (MD: MM_ENC_MAX_POINTS).
Caution
!
Changing the MD: MM_CEC_MAX_POINTS[t] or MM_ENC_COMP_MAX_POINTS au-
tomatically reorganizes the NC user memory when the control system is booting. All user
data stored in the user memory (e.g. drive and MMC machine data, tool offsets, part pro-
grams, compensation tables etc.) are deleted.
S
Enter the compensation value for the intermediate point N in the compensation value table
(ENC_COMP_[0,N,Axi]).
S
Select the distance between the individual intermediate points (ENC_COMP_STEP
[0,Axi]).
S
Select the start position (ENC_COMP_MIN [0,Axi]).
S
Define the end position (ENC_COMP_MAX [0,Axi]).
S
In the NC, set MD: ENC_COMP_ENABLE(0)=0. This is the only way to load the compen-
sation table.
S
The compensation values for the machine axes are entered into the NC memory by means
of a part program (see also example in the Manual "Description of Functions")
4-84
SINUMERIK 802C
6FC5 597–3AA20–0BP2 (01.02)