I tried using a DM860T to replace a blown DMA860H, but I could not get it to drive the motors at all. My system consists of stepper motors powered by 70VAC. If I plug the inputs and motor wires to a still working DMA860H, the motors will work no problem. But the exact same configuration on a DM860T results in no movement, all settings and switches identical. Also, all the drives briefly flash their Fault LED red when powered on, but the DM860Ts stay lit for significantly longer than the DMA860H. Could this be an indication of some kind of fault?