GE DS3800HMPG Dual channel assembly module

The average transformer secondary current equals the sum of the average currents for all 6410s powered by the supply. Because the transformer supplies pulses of current to charge the “bus” capacitor(s) on the other side of the diode bridge, the rms current is higher than the average current. The transformer should have a rated secondary rms current of at least 1.8 times the average current.

Example 

The transformer used to supply three 6410 drive modules, each set for 5 Amps rms should have a rated secondary rms current of 1.8 * (5 + 5 + 5) = 27 amps or greater. Note: It is generally not advisable to significantly oversize the transformer because this will increase rectifier surge current during turn on, as well as capacitor ripple current.

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