The USB controlled power Relays are near their AC fuse operating limit which has caused some Fuse failures.
To reduce the power consumption of each FEE64 it is possible to power down the Waveforms ADCs saving about 20W per FEE64. 

To Powerdown the ADCs in a FEE64 use the 'Local Data' browser window from the 'Control' browser window. Change the setting of the ADC Control 
Register at offset 2 from 0 to 0xFF. All the FEE64s can be thus controlled by using the 'Act on all' tick box.
Clearly, the System Check for ADC calibration will now fail for all those that are powered down.

To Power up the ADCs change the setting from 0xFF to 0. Then using the FADC Calibration browser window calibrate the FADCs. 

The SYSTEM should be in the 'STOP' state during these procedures.

Should the SYSTEM be power cycled then the ADCs will be powered up.

Saving at the 16A AC fuse is estimated to be 3A as there are 16 FEE64 being powered through each.