Haas Alarm: 171 (M) APC-PALLET CLAMP TIMEOUT – The pallet in the mill did not clamp in the time allowed. Check for foreign objects under the pallet and between the pallet and the clamp plate. Verify an adequate supply of air pressure and volume. Check air solenoids for sticking and air release ports for clogging. Check pallet position switch for correct operation, the switch and wiring for damage, and pallet alignment. Check the pallet clamp mechanism for correct operation. After determining cause and correcting problem, run M50 P1 in MDI to recover the pallet changer and continue operation. Parameter 320 specifies the pallet clamp timeout period.