There is only one Ac drive controlling both motors, there is a motor on the left and on the right of the gearbox. The motors are in phase with each other, one motor spins forward and the other in reverse, they are properly phased. The Ac drive was swapped with the escalator next to it and the same fault occurs. The Ac drive is in vector control mode and does not get a reference from a encoder. There are four braking resistors wired in series parallel. I will get the specifications of the resistors "wattage and ohms" and post it later on today if I get a chance.
Thanks.
