Lenze EVS93xx CrossCutter - Manual (Page 77)

Cross Cutter
Features of the "Cross Cutter" prepared solution
 Prepared Solution Servo PLC / ECSxA 1.1 EN 2-63
2.5.9 Adjustable compensation speed for mark correction
There are two ways of compensating the detected path difference. Either a speed signal can be
applied to the master speed directly to compensate the path difference or the detected path
difference can be compensated by superimposing a positioning profile. When compensating the
path difference please note that the path difference may not be compensated if the knife is
cutting the material. If compensation is applied during this phase, the speed of the knife will no
longer be synchronised with the material speed and this will damage the material. A function
block interconnection has been implemented in the prepared solution accordingly to prevent this
happening. Any mark correction in progress will be aborted as soon as the knife cuts into the
material. Mark correction is only activated in Continuous cutting mode.
Mark-controlled operation with touch-probe synchronisation without ramp generator:
The detected path difference is compensated with a fixed additional speed on the actual cam
value (see Figure 22 ). For this purpose, a fixed additional speed is applied to the master value
until the path difference is compensated. At this point the additional speed is withdrawn. If the
cross-cutter knife cuts into the material whilst mark correction is active, correction will be
aborted by setting the speed to 0. This will prevent deviations in the synchronous speed during
cutting. To activate mark-controlled operation with mark synchronisation but no ramp generator,
bit 21 must be enabled in application control word code C4135/000 (g_bXTpEnable variable =
TRUE) and bit 22 disabled (g_bRfgTPEnable variable = FALSE). The value of the fixed
additional speed is written in code C3650/001 and transmitted to global variable
g_nTPMakeUpLeeway_v (the signals are wired in the CrossCutterInterfaces PRG (network 6)).
Bit 7 of application status code C4150/000 indicates that mark correction is active
(g_bXTpSyncBusy variable = TRUE).
Figure 22: Graph illustrating mark control with touch-probe synchronisation but no ramp
generator
Compensation speed (fixed)
g_nTPMakeUpLeeway_v
Master speed
Master value
x touch-probe
signal (I5)
Correction active
g_bXTpSyncBusy