Solution
The maximum power, voltage, and current values, are dependent on the model variation (i.e. 9420-12, 9420-24, etc.) and mode (phase configurations) you're using.
In the NHR 9410/9420 manual, the modes and max values start on page 165. There is additional range information in the specifications section on page 22.
You can find the NHR 9420 manual in the Related Links section below.