Allen Bradley PowerFlex 753, PowerFlex 755, PowerFlex 755T & PowerFlex 755TS Drive
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Mar 14, 2024 6:48 am
Cause : Travel Lim Cflct comes when travel limits are in conflict. Both the forward and reverse travel limits indicate that they are simultaneously active.
- If digital limits (hardware signals) are in use, ensure that the following forward and reverse digital input pairs are not both off simultaneously: fwd/rev decel travel limit digital inputs and fwd/rev end stop travel limit digital inputs.
- The travel limit digital inputs are meant to be connected to normally closed switch contacts, so the digital input status reads an off (0 = False) bit status when the machine is on limit and the switch contact opens.
- A possible cause for this condition is loss of common power to both the forward and reverse travel limit switches.
- If software travel limits are in use, check the state of the fwd/ rev travel limit bits in P1101 [Trq Prove Setup].
- These bits read an on (1 = Enabled) bit status when the machine is on limit. Bit 2 “Decel Fwd” and Bit 4 “Decel Rev” should not be on simultaneously.
- Similarly, Bit 3 “End Stop Fwd” and Bit 5 “End Stop Rev” should not be on simultaneously.