GEC ALSTHOM MVTT14B1BA0773C Sequence control module

The output current is sensed by shunt R12 mounted in the power supply. The output of the current channel can be measured at B1. It should be -0.7 volts shutdown or 6 volts. Voltage and current channels are "ORed" via diodes CR41 and CR31, and thus provide automatic crossover from current to voltage control and vice versa.

PULSE WIDTH MODULATOR 

The "core" of the A100 board consists of the four UC 3825 controllers. U15, U16, U17 and U18 are synchronized by the clock consisting of U4, U20, U21, U22, U23, and output drivers U22A-B, which comprise the sync needed to control the point at which the oscillator ramp begins. All error amplifiers of U15, U16, U17 and U18 have a unity gain. Their inputs are tied together and receive their signal from U7 and U9. Q4, Q6, Q8, and Q10 isolate the clock signal from the oscillators to provide slope compensation for U15, U16, U17 and U18.

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