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Which control failure commonly results when industrial robot joint encoder pulses are lost?

A)Runaway motion on affected axis
B)Reduced pneumatic gripper force
C)Inconsistent welding arc strength
D)Increased susceptibility to EM interference

💡 Explanation

Encoder pulse loss disables position feedback, halting closed-loop control; therefore, the servo motor receives commands with no corrective response. Because Proportional-Integral-Derivative (PID) control is lost, runaway motion happens rather than controlled movements or weaker performance involving peripheral tools.

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