Lenze EVS93xx CrossCutter - Manual (Page 78)

Cross Cutter
Features of the "Cross Cutter" prepared solution
 Prepared Solution Servo PLC / ECSxA 1.1 EN 2-64
Mark-controlled operation with mark synchronisation and ramp generator:
A positioning profile is superimposed to compensate the detected path difference (see Figure
23 ). This prevents speed step changes in the master value signal during path difference
compensation (such step changes are typical of mark correction without a ramp generator). A
speed signal generated from the positioning profile is superimposed on the master value signal
to compensate the path difference. The use of positioning profile ramps enables the
compensation speed to be ramped up slowly and then back down at the end. To activate mark-
controlled operation with mark synchronisation and ramp generator, bit 21 must be enabled in
application control word code C4135/000 (g_bXTpEnable variable = TRUE) along with bit 22
(g_bRfgTPEnable variable = TRUE). A maximum possible correction speed can be written in
code C3650/001 and a maximum negative correction speed in code C3650/002. The ramp
times for the abort ramp, acceleration ramp and deceleration ramp can be written in codes
C3649/001, C3649/002 and C3649/003 respectively. The abort ramp is used whenever the
cross-cutter knife cuts into the material when mark correction is active. In such an instance,
mark correction will be aborted with the time set in the abort ramp. This will prevent deviations in
the synchronous speed during cutting. The abort ramp is controlled via global variable
g_bRfgXTpExecute. This variable is always TRUE if the knife is not cutting the material. In such
circumstances it will therefore be possible to compensate a detected position deviation. Bit 7 of
application status code C4150/000 indicates that mark correction is active (g_bXTpSyncBusy
variable = TRUE).
Figure 23: Graph illustrating mark control with touch-probe synchronisation and ramp
generator
Master speed
Master value
x touch-probe
signal (I5)
Correction active
g_bXTpSyncBusy