I have a problem with a O&K escalator. The Ac drive is a Telemecanique 40 horsepower drive with a braking resistor. The problem is that when the escalator is running in the down direction with a full load of people the ac drive faults out with a overspeed speed fault. The escalator has two motors and the drive has a braking resistor. Isn't it the duty of the A.C drive to control the speed of the escalator under load. Any comments or suggestions will be greatly appreciated.
