Honda CB350 CL350 [123/219] Electrical parts 112

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112 5 ELECTRICAL PARTS On the Honda 250 350 a bridge rectifying circuit is adopted as shown in Fig 5 37 In this system a greater number of selenium wafers are used however the feature of this type is that a full wave rectification can be achieved rather than a half wave rectification as is the case with other systems Fig 5 37 Generating coil Battery 3 Load Fig 5 37 Heat will have great effect on the life of the selenium rectifier it should never be exposed to the ambient temperature over 50 C 122 F Further excessive current should not be allowed to flow for any extended period likewise voltage exceeding the capacity should not be permitted to flow in the reverse direction as this will puncture the rectifier However insulation will quickly form over the punctured area but with repeated puncturing the effective rectifying area will be reduced and will evntually result in the overheating of the rectifier Therefore in order to handle the voltage generated by the coil the wafers must be increased to provide for sufficient reverse capacity NOTE Handling the selenium rectifier 1 Do not allow water to get on the rectifier make a wrong wiring connection or subject it to abuse Selenium rectifier usage is semi permanent 2 Using the rectifier without any load connected such as without the battery will cause a high voltage generated in the coil to flow in the reverse direction and cause puncturing of the rectifier 3 If this condition is permitted to continued for a long period the rectifier will be completely destroyed 4 Selenium rectifier when left unused for a long period of time will have a large reverse current flow This condition can be corrected by applying about half the normal voltage initially and increasing the voltage to the full rating over a period of one hour before using the rectifier

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