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ACTOM SIGNAL MONITORING

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ORIENTATION Actom signalling is a division of railway transportation that provide services to the public and industries, which the main purpose is to help improve train services at reasonable cost as a result the need for a safer and more effective train control becomes more important, the factors such as motive power, communication, track, train and signalling are considered to play important role in the railway industry. The Actom Company provides Signalling methods or elements for points, signals, track circuits, interlocking (relay) which combines and interlocks the points, signals, and track circuits which serves together under the general purposes of: Ensuring a safe distance between trains on the same line. Safe guarding the movement of trains at crossings.   Regulating movement of trains depending on circumstances. THINGS PRODUCED IN ACTOM   Planning and designing skills including the following: free wired interlocking, relay interlocking, Geographica...
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POWER SOURCES

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BOLOMETER POWER SUPPLY CIRCUIT DISCRIPTION The circuitry provides power to the bolometer. It drives its DC voltage from the transformer T1 and the diode bridge D7. The smoothing of the supply is done by the capacitor C13. Varistor RV2 provides transient protection. The circuitry consists of U4 a switched mode power supply integrated circuit. It is configured in the step down mode of control. L2 is charged when the internal transistor is turned on. During the off cycle diode D4 is conducting and the energy stored in L1 is transferred into the capacitor C8, C8 maintains the average output voltage. Resistor R7 and R9 provides the feedback voltage to control the on/off duty cycle. TESTING I did visual inspection by checking transformer T1 connection for correctness. The primary winding is on the left of the connector T1 as shown by the two wires on the photograph above. The secondary winding is on the right of T1 a...
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