Controls and panel layout 1. Control a. The power supply is controlled by motorized ac variable transformer with the capacity of 50 amps single phase and fine tuning controlled by 2 amps single phase motorized variable transformerb. Mcb protected in input side c. We provide zero start facility to the power supply for protecting middle operationd. Input with 8mm epoxy bushing and output with copper buzbar for each 2500 amps e. The maximum output current is directly proportional to the supply voltage. f. we provide push button switche for, switch on 2500a, cut off , increase and decrease switches for direct and fine tuning g. To select output current for 2500, 1250 amps we provide buz-bar terminations in the back side of the enclosure and link buz-bar. The direction for linking we provide drawing in the top of the enclosure operational proceedure ensure that the variable power supply is connected to the proper 240vac, 50hz single phase power source. The wall outlet must be a two-wire neutral type, with a good earth ground.Always the cable entry panel should be closed after the connection of input and output cable protect from the direct shock connect the ac power cable with sufficient power source to the input epoxy bush, it should be fully tightened otherwise it may cause to heat and fire switch on the input mcb and confirm the main indicator lamp blows, but it should be sure about the voltage is zero position that the zero start is connected. press the switch on push button for loading the current. And gradually increase the voltage with push button provides for increase and decrease the voltage. Adjust the output current to the desired level and apply the fine tuning push button to get the exact output current