Which set of power supply instructions are you using? The set for the 3A CC rectifier are backwards. The 20A unit listed below it has the correct directions, this is the correct set for both units.
If this isn't the problem (it worked with nickel) the voltage compliance of the PS can't go low enough to accommodate the very high conductivity of copper. You can fix this by putting a power resistor in series with the power supply; something about 1 to 5 Ohms, and 15 Watts or larger. The resistor will drop a few volts and allow the PS to startup. Unlike anodizing, you will need to keep the resistor in the circuit for the entire plating operation.
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