Eliminated from?
EVS93xx-EK V8.1, EVS93xx-CK V8.1
Behavior of the new version?
From the current version V8.1 feed cams with a non-integer feed length (decimal remainder handling necessary) in combination with x offset on input CDATA-XOFFS can be used without restrictions.
What happens?
The drive controller indicates a Ccr trip.
When does the problem occur?
The problem occurs if
- feed profiles are used (CDATA-REL-SEL = TRUE) and
- the incremental cam profile length xmax is not integer and
- an x-Offset <>0 is selected via the CDATA-XOFFS input.
Possible diagnostics?
Check the x-length of the feed profile by applying the following equation:
xmax[incr.] = xmax[m_units] * C1303/1 * 65536[incr.] / C1303/2 / C1304/0
If the result has decimal places and at the same time an x-offset unequal zero is selected via the
CDATA-XOFFS signal input, the behaviour described before may occur.
Short-term measures/recommendations?
- Only use integer cam profile lengths by adjusting the values for gearbox numerator (C1303/001), gearbox denominator (C1303/002) and axis feed constant (C1304) accordingly. In order to adapt the master dimension system to the real machine conditions connect the CONV7 function block between the master value source (e.g. DFIN) and CDATA-DFIN.
- Do not use the x-Offset (CDATA-XOFFS = 0).
Evaluation:
The behaviour is detected immediately during initial commissioning. It can be avoided by applying the procedure described under
Short-term measures/recommendations.
