Lambda pmn Instruction Manual

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Lambda pmn Instruction Manual Manual pdf 21 page image

Figure 5.2 Output Current MeasurementA series terminating resistor (or series inductor or clamp diode) must be added as shown ifthe average value of the peak current exceeds 110% of the normal output current.When choosing Rs, ensure it can withstand the full output voltage across it as well as thepower dissipation caused by discharging Co (see Table 5.1) and Cc (20pF/ft) (65.62 pf/m)each cycle as well as conducting the normal output current. It's power dissipation can becalculated as .Pd = (IO 2 RS) + 1/2(CO + CC ) V2 (REP RATE)Table 5.1 Output Capacitance230pF40kV460pF10-30kV15nF3kV-6kV60nF1-2.8kVCoOutput Voltage The 500A/102A/152A/202A power supplies are designed for simple parallel operation. Theinput power and HV output should be connected directly together. The REMOTEconnectors on the input panel can also be connected directly together using a "daisy chain"ribbon cable from the system controller. Each of the power supplies operate at the sametime with the total charge rate equal to the sum of each.Sometimes when operating several units in parallel, the high total power generates noisewhich interferes with the power supply control. This is usually due to the manyinterconnecting control cables acting as an antenna picking up noise. The problem usuallyappears as one or more of the power supplies shuts down when the output voltage increasesbeyond a certain level. Dressing the control cables as short as possible and close to groundor using shielded cables should help. In severe cases, it is necessary to wrap the cablesseveral times through high permeability ferrite cores at the input panel of each unit.The 500A/102A/152A/202A power supplies can also be used as an Isolated High Voltagecontinuous DC power source by adding an external filter capacitor. The value of the filtercapacitor depends upon the value of the allowable output voltage ripple value. For paralleloperation into DC loads, please contact EMI Customer Service Department. (See Section 5.6).83-493-001 Revision G5 - 2 Applications