What would cause DC bus voltage on my VFD when the disconnect is off
If the wires are long, not shielded and there are power signals near them, you´ll get some voltage to ground. The output IGBT diodes, looking from the motor side, is a 3 phase rectifier and will charge the DC bus capacitors. Disconnect wires and measure voltage to ground when the other VFD is running or stopped. Shielded cables will reduce this voltage. Also a resistive load (with power losses when running) in output terminals can help, but be careful with a filter, as you can overload the own filter or the VFD output.