tiedown.wp6

11-10-99

Isolation for block lift-off switches: Use a transformer whose secondary is shorted by the closed lift-off loop. This lowers the impedance of the primary, activating a rectifier ckt to feed the safety chain in the ladder logic.

Revisit the system design; what is the proper response when block lift-off is detected? Original idea was simply to disable the motor and leave the block hanging (toe protection?!).