The present invention relates to a method for supplying current to a gradient coil (107,207) of a magnetic resonance imaging system (100) by a gradient amplifier (222), the method comprising: supplying, by an electrical power supply (241), a voltage at first level to the gradient amplifier output to generate a gradient current in the gradient coil (107,207) to produce a magnetic gradient field at an slew rate, wherein the slew rate is set to a first value, resetting the slew rate to a second value, comparing the second value to the first value, and adjusting the voltage to a second level if the second value is different from the first value.