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HEF4046 unable to achieve stable lock condition

Question asked by Tan Raymond on Jun 30, 2016

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I am using PLL HEF4046 to phase lock a 50/60 Hz SIG_IN between a BLDC motor with reflective object sensor (OPB704 by TT Electronics) which convert the blade rotation and input them as feedback into PLL COMP_IN. However, the PLL keep lock and unlocking, and not able to achieve a stable lock condition. I am seeking advice or any field engineer able to come on site for advice? Attached is the circuit.

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