Hi, we are replacing an old Reliance DC drive with a Quantum 3 drive. The motor has a 240 vdc armature. The iso transformer for the drive is 480 vac 3 phase. We already have the drive here and we read in the manual that it is not recommended to use 480 vac on a drive for a 240 vdc motor. We were going to try it anyway, thinking that it has worked for over 20 years with a Reliance drive with 480 vac, but a tech from Quantum said he did not think there was any way it could have running like that for years. Has anyone seen 240 vdc motors operate from drives with 480 vac supply voltage? Also the transformer is delta wye and the transformer has a wire going from nuetral junction on wye side, going to armature. Why would it be wired like this? Is the wire from transformer to armature to give armature ground? We are going to order a step down transformer, but I would like to learn more about this. Thanks for any information.