JEM 100 CX, Powersupply.

Todo : Add circuit diagrams Finish the pictures Overview : The Jeol JEM 100 CX is powered from a single phase at 100, 200, 220 or 240V. All the power is handled by the power supply cabinet. There are three major transformers and one large inductance on the base plate. The rest of the power electronics are mostly mounted on the side walls. Another dominant feature is four 150 ohm, 200W power resistors that loads the 450V lens supply. The power supply works in basically three different modes, TEM off - only one transformer is on (T1), supplying power for the power-on circuit. TEM on, only pumping vacuum - T1 now powers the roughing pumps, the diffusion pumps and the room light. Relay TEM on, pumping vacuum, lenses and HT on - The power supply cabinet without covering plates. The power supply is contained in a separate cabinet on wheels. Here we have removed the plates that normally covers it The fuse panel. On top of the front there is the fuse panel with 12 fuses and their respective warning lamps. The lamp is lit if the fuse is broken and there is a load connected, ie a blown lens power supply fuse will not warn until you try to turn the lens on. The meaning of the fuses is (from left to right) (1A) Room light (screw terminal in power supply). (5A) Internal power supply service outlet. (7A slow) Compressor. (1A) Vacuum system control circuit. (5A) Oil rotary pump 1 (RP1) (5A) Oil rotary pump 2 (RP2) (5A) Oil diffusion pump 1 (DP1) (5A) Oil diffusion pump 2 (DP2) (3A) Shutter, exposure meter, etc. (2A) Vacuum gauge, etc. (5A) Beam deflector power supply, high voltage power supply. (15A) Lens system power supply. In older systems there were thirteen fuses, the high voltage power supply had a separate fuse. There is also a lamp, telling there is power in the system. This lamp is burning even when the microscope is turned off. If it isn't on then either there is no power in the cabinet or the automatic 20A fuse (S1) have trigged. Main power inlet and room light. The main power cable is connected to the left screw terminal. It then goes via the 20A automatic fuse into the rest of the power supply. To the right is the connection for the room light. It could either be 100V or 200V, selectable by moving the orange cable on the screw terminal above. Power connector panel. This is the connector panel for the various power supplies used in the TEM. The aluminium can to the left is a thermal 20 minutes time delay (TS1) that keeps the cooling water going until the diffusion pumps have cooled down enough. There are three relays on the panel, two on the front and one on the back side. RE1 guarantees that the power isn't cut if the pressure is too low in the compressor. RE4 turns on the room light outlet. RE6 turns on the power to the high voltage. At the upper right corner is a 100V service power outlet, (protected by fuse F1 on 5A).