text: <s>[INST] Kinetix 5500 excessive velocity fault Summary: Two drives in same motion group fault simultaneouslyWe have a machine with four 2198-H008-ERS in the same motion group, all with VPL-B0752F-P motors. The power, bus and control are connected with the bus system. In the ladder logic, they all are treated as if they were the only drive, although they operate as pairs. We are experiencing Excessive Velocity Error on an erratic basis(once or twice per shift). The last event was that both drives in one pair faulted at exactly the same time. This may be a clue, just not for me. We have adjusted the Velocity loop parameters in various ways to try to eliminate these faults. [/INST] I would try increasing the velocity loop error tolerance and let the position loop error tolerance catch the real fault (jams, etc.). \\n </s>