BLOCKsignalling CDU4C Extra High Capacity Capacitor Discharge Unit at AJMRailways.com

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"Designed and manufactured in the UK using lead-free solder and renewable energy." Amanda		BLOCKsignalling CDU4C Extra High Capacity Capacitor Discharge Unit Ref: CDU4C in stock. $26.00 Shipping per unit: $1.50 Quantity: Product Details: BLOCKsignalling CDU4C Extra High Capacity Capacitor Discharge Unit Model railways which use points primarily use points motors which creates a linear movement of about 5mm (1/4in) of the blades of the points. To create this movement, the simplest device is the solenoid which consists of a coil of wire wound on a former. Inside the former is an iron actuator or slug which can be pulled into the coil when the power is applied. By placing two of these coils end-to-end, a forward and reverse motion can be created. These two-solenoid point-motors are usually switched by short pulses of electricity. The pulse length is often determined by the operator or by a simple spring-loaded switch. But there are several problems with this arrangement. Point motors require a considerable amount of current for their operation. This means the full capacity of the transformer will be needed and any other items using the same supply will suffer voltage drop during the coil operation. The high currents can play havoc with switches. The back emf (reverse voltage) generated by the solenoid is sometimes sufficient to cause sparks and weld the switch closed. This will keep the current flowing through the solenoid and it will overheat very quickly. A Capacitor Discharge Unit (CDU) overcomes all these problems. CDUs supply a high current to the solenoid. This current burst is over by the time the switch contacts open, thus eliminating back emf across the switch contacts. Should a solenoid be left in circuit, the current flowing through it (after the initial surge) will be less than 50mA so it will not do any damage to the coil. The BLOCKSignalling CDU4C is designed for the ultimate in performance and future proofing, for larger or growing layouts. Features: - Provides a high current pulse to operate points - Prevent points' motor burn-out by limiting subsequent current - Regulates charging current to prevent voltage fluctuations on the rest of the layout Each Unit comes with fitting instructions but to view these before purchasing please copy and paste the link below to your Internet Browser: http://www.blocksignalling.co.uk/pdfs/CDU.pdf

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