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How do I fix an F66 Safety Torque off Fault code for a DG1 drive?

The safety torque off fault occurs when the safety circuit opens, by default the yellow terminal block comes with a jumper installed form the factory, if the jumper or terminal block is removed the drive will go into fault. If there is a safety circuit that is connected to the terminals it should be a normally closed contact from there if that circuit opens it will cause the drive to shut down the output by bypassing the control board. In most cases this fault occurs due to an estop being pressed or some safety circuit getting open, go through and check the circuit and wiring. If everything is okay there remove external circuit and replace with jumper to see if resetting fault will clear the fault, if it doesn’t clear replace control board.