It has been a while, but if memory serves me, this is the circuit that shuts down the C circuit if the car is still in High speed, FE relay up, when the car hits the emergency terminal slowdown switches. the only way to reset it is to turn off power, or recycle one of the safety devices in series with the C relay. Some how you are not getting a normal slowdown at the bottom floor, or your slowdown switches are flaky.
