Rectifiers - Generator Parts

RSK6001GP Rectifier Assembly Diode Kit

Tracy Eray — Tue, 20 Feb 2018 03:49:41 +0000

This RSK6001GP Rectifier Assembly Diode Kit is manufactured for Stamford Generators and is used on the HCI434, HCI534, HCM434 and HCM534 models. The diode kit is made to fit on the generator ends and contains 3 positive diodes, 3 negative diodes and a surge suppressor. Theses diodes included are responsible for providing power to the Alternator rotor so it can induce voltage to the main windings of a Stamford alternator. A faulty diode may produce several failing conditions that will cause further damage to the alternator, including increased excitation which may damage the exciter rotor, or loss of voltage that will end up causing overload to the voltage regulator. All the components of this kit are mounted in parallel with the revolving field coil. Once the diode kit is assembled it is attached to the main rotor of the alternator. The unit should be fitted using a calibrated torque wrench as the unit is delicate and needs the correct torque to work efficiently. These units are useful when needing to replace a diode that has blown in a rectifier. Replacement of all relevant parts is easiest, as it is often difficult to determine which diode is faulty.

Diode replacement with a RSK6001GP Rectifier Assembly Diode Kit

To determine which diodes are faulty on the main rectifier assembly, they can be checked with a multimeter. The flexible leads connected to each diode should be disconnected at the terminal end and the forward and reverse resistance for each then measured. The rectifier assembly is split into two plates, positive and negative, and the main rotor is connected across these plates. Each plate has 3 diodes, and the negative plate carries the negative based diodes and the positive plate carries the positive based diodes. Blown diodes must be replaced with the correct units.

Main benefits of using a RSK6001GP Rectifier Assembly Diode Kit

These kits are made for Stamford alternators and generators and are far more cost effective than purchasing a new rectifier. They contain the identical components that are already in the rectifier. Changing the parts will ensure that the user has in essence a new rectifier and providing the components are correctly replaced the rectifier should work as new. Check the markings on the diodes to establish the correct direction of electrical flow. The components are relatively easy to replace and once installed will ensure that the rectifier unit operates correctly. The surge suppressor will not affect the working of the unit but is an important component. Order a RSK6001 diode kit from Generator Parts today.

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YMD-002 VARISTOR

Tracy Eray — Tue, 20 Feb 2018 03:30:49 +0000

Varistors come in a wide range of voltage limits. They have their specifications printed on them. The name varistor is a combination of variable and resistor and is only used for non-ohmic varying resistors. This is an electric component with an electrical resistant that varies with the applied voltage. It is also known as a voltage dependent resistor and has a nonlinear, non-ohmic current voltage characteristic. This is a relationship between electric current through a circuit, device or material and the corresponding voltage across it. The varistor is similar to a diode but in contrast to a diode however it has the same characteristic for both directions of traversing current. At a low voltage it has a high electrical resistance which decreases as the voltage is raised.

Characteristics of the YMD-002 varistor

These units are used as control or compensation elements in circuits, either to provide optimal operating conditions or to protect sensitive and delicate components against damage by transient voltages. When these units are used as protective devices they shunt the current created by excess voltage away from the delicate and sensitive components which would otherwise sustain possible terminal damage. The most common type of varistor is the metal oxide varistor also known as an MOV. This consists of a ceramic mass of zinc oxide in a matrix of other metal oxides and is sandwiched between two metal plates. These plates are the electrodes.

Uses of the YMD-002 Varistor

A varistor is primarily used for suppressing line voltage surges. These surges can do immense damage to an electronic device. There are two main reasons for a varistor to fail. The first being a surge of electricity through the input line which can be caused by lightening. The enormous power of such a surge is enough to melt or even vaporise the varistor as the energy involved is many magnitudes higher than the varistor can handle. The second most common reason is cumulative degradation which happens slowly over time. Each surge that the varistor experiences weakens the unit until it is no longer capable of functioning. Order your YMD-002 varistor from Generator Parts today.

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SSAYEC432 Diode Kit

Tracy Eray — Tue, 20 Feb 2018 03:21:44 +0000

This SSAYEC432 diode kit is suitable for the Leroy Somer Facon alternator. A diode is in effect a switch which allows electrical current to flow in one direction only. They are primarily used in power supply operation. The rectifier diodes can handle higher current flow than regular diodes and are used in order to change alternating current produced by the alternator which cannot be used by the machine into direct current which can be used by the machine. They are designed as discrete components or as integrated circuits and are usually fabricated from silicon although other materials such as selenium and germanium are used.

Characteristics of the SSAYEC432 Diode Kit

The first step to take when the rectifier is showing signs of incorrect functioning is to test the diodes and surge suppressor or varistor in the rectifier. First disconnect the diodes from the terminal end and using a multimeter check the diodes in both the forward and reverse direction. If any fault is found all the diodes should be replaced. If the varistor or surge suppressor is found to be faulty the diodes as well as the varistor should be replaced. All diodes rectify but the term is normally used for higher currents and voltages. Diodes only begin conducting electricity when a certain threshold is present. The rectifier assembly or diode kit is made up of six diodes in equal numbers of forward and reverse biased diodes.

Benefits of the SSAYEC432 Diode Kit

One of the main benefits of the diode kit is that is if far more economical than purchasing a new rectifier. The diodes or the surge suppressor or varistor are usually the components that will fail. They are designed to protect more expensive equipment in case of a surge in power. The constant power fluctuations when the generator or alternator is switched on and off will eventually cause wear on the diodes and varistor. If the varistor fails there is no protection for the diodes and these may eventually fail. The units become weaker with each power surge. Unfortunately unlike a huge power surge it may not be visible to the naked eye. Order from Generator Parts today.

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RSK5001GP Rectifier Assembly Base

Tracy Eray — Tue, 20 Feb 2018 03:20:05 +0000

The RSK5001 base rectifier kit is made for use in Stamford alternators. It can be used in the HCI434, HCI534, HCM434 and HCM534 models. The base rectifier assembly is made to fit on the alternator rotor and it contains 3 positive diodes, 3 negative diodes, a surge suppressor and a plate. These components are mounted in parallel with the revolving field coil. Once the base rectifier assembly is correctly assembled it is attached to the main rotor of the alternator. The components should be fitted to the plate using a calibrated torque wrench as the diodes are delicate and need the correct torque to ensure good mechanical and electrical contact.

Benefits of the RSK5001GP Rectifier Assembly Base

The main benefit of the base rectifier assembly is the price. It costs substantially less than a new rectifier. In order to ascertain whether the diodes or the varistor are faulty a multimeter should be used. The flexible leads on each diode should be disconnected at the terminal end and the forward and reverse resistance for each measured. The varistor should be checked in the same way. If any of the components are found to be faulty all the items should be replaced. All diodes should be replaced even if only one is faulty and the varistor or surge suppressor should be replaced at the same time. Care should be taken to replace the positive and negative diodes on the corresponding plates.

Benefits of using the RSK5001GP Rectifier Assembly Base

The kit is made especially for Stamford alternators and generators and contains the identical components that are found in the original rectifier. Changing the parts, which will weaken over time depending on the amount of surges experienced, will in effect provide a new rectifier and providing the parts are correctly fitted it should work as new. Check the markings and colours of the diodes to establish the correct direction of electrical flow. As it is difficult to visually assess the surge suppressor’s condition it should be changed as a matter of course. Order a RSK5001 base rectifier assembly from Generator Parts today.

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RSK6001GP Rectifier Assembly Base

Tracy Eray — Mon, 19 Feb 2018 15:07:19 +0000

The RSK6001GP Rectifier Assembly Base is for use on the Stamford HC6, MV6, MV7 and P7 alternators. The kit consists of 2 varistors with 3 negative diodes and 3 positive diodes. The threads on the diodes are all metric and the only difference between the RSK5001 and the RSK6001 is that the RSK6001 has 2 surge suppressors compared to only one surge suppressor or varistor with the RSK5001 rectifier assembly kit. The diodes are clearly marked with red leads for the positive or forward diodes and black leads for the negative or reverse diodes.

Technical characteristics of the RSK6001GP Rectifier Assembly Base

The rectifier converts alternating current induced in the exciter rotor windings into direct current to magnetise the main rotor poles. The rectifier comprises two semicircular annular positive and negative plates each with three diodes. In addition to connecting to the main rotor, the direct current output of the rectifier also connects to a matched pair of varistors, one at each end of the plates. These additional components protect the rectifier from voltage spikes and surge voltages that may be present on the rotor under various loading conditions of the alternator. Diodes provide a low resistance current in one direction only. The varistors can be checked for faults by examining them for outward signs of overheating like discolouration, blisters or melting and disintegration. The varistors should also be checked with a multimeter. If a fault is found then both varistors must be replaced with a matched pair.

Characteristics of the RSK6001GP Rectifier Assembly Base

The diodes in the rectifier assembly should also be checked with a multimeter after carefully disconnecting them at the terminals. Measure the voltage drop across the diode in the forward direction and then measure the diode in the reverse direction. If any fault is found in any of the diodes they should all be replaced with the full set of six diodes. The diodes should be screwed into the threaded holes in the rectifier plate and 2.6 to 3.1Nm torque should be applied to ensure a good mechanical, electrical and thermal contact is made. Order a RSK6001 base rectifier assembly from Generator Parts today.

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RSK2001GP Rectifier Assembly Base

Tracy Eray — Mon, 19 Feb 2018 15:05:37 +0000

The RSK2001GP Rectifier Assembly Base is manufactured for use in the UC22/27 range of alternators of brushless rotating field design. The rectifier converts alternating current induced in the exciter rotor into direct current to magnetise the main rotor poles. The rectifier comprises two semi-circular annular positive and negative plates each with 3 diodes. In addition to connecting to the main rotor, the direct current output of the rectifier also connects to a varistor. The varistor protects the rectifier from voltage spikes and surge voltage that may be present on the rotor under various loading conditions of the alternator. Diodes provide a low resistance to current in one direction only.

Replacement of the diodes in the rectifier assembly

The diodes are either negative or positive and must be fitted to the corresponding plate. After disconnecting the diodes at the terminal end test the units individually and measure the voltage drop across the diode in the forward direction using the diode test function on a multimeter. Then measure the resistance across the diode in the reverse direction. If any of the diodes are faulty replace the full set of six diodes in the rectifier. First remove all the diodes then place a small amount of heat sink compound only to the base of the replacement diodes. Check the polarity of the diodes to make sure that the positive diodes are fitted to the positive plate and the negative diodes to the negative plate.

Benefits of using the RSK2001GP Rectifier Assembly Base

The rectifier kit is substantially cheaper than a new rectifier. The components are easy to replace and in essence will provide a new rectifier at a reduced price. One of the most important uses of diodes is to prevent circuit damage due to electromotive force. This is a momentary change in the direction of the flow of electricity when machines such as generators and alternators are switched off. The diodes are easily recognisable as either positive or negative. Diodes are usually marked in colour code and writing with their individual voltage and current tolerances. Order your RSK2001 base rectifier assembly from Generator Parts today.

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RSK2001GP Rectifier Assembly Diode Kit

Tracy Eray — Mon, 19 Feb 2018 15:02:12 +0000

A RSK2001GP Rectifier Assembly Diode Kit is necessary if a diode in a rectifier has blown. This kit saves immensely on the price of a new rectifier as it supplies only the six diodes and a surge suppressor. The RSK2001 series diode kit is made for Stamford Generators PC144, SC2, SC3, UCI244 and UCI274 models. To establish that one or more diodes on the rotating rectifier assembly have blown a multimeter will be necessary. Disconnect each diode at the terminal end and check the forward and reverse resistance. The rectifier assembly is split into two plates, positive and negative, and the main rotor is connected across these plates. Each plate carries 3 diodes for the positive plate and the negative plate.

Characteristics of the RSK2001GP Rectifier Assembly Diode Kit

The diodes are clearly marked positive or negative and care must be taken to insert them into the correct plate. The diodes should be fitted tightly into the plate to ensure a good mechanical and electrical contact. The recommended torque tightening is 4.06 to 4.74Nm. The surge suppressor should also be replaced. This is a protection device which prevents high voltage transients from damaging the main rectifier diodes. High voltage transients are created by fault conditions in the distribution system. A good surge suppressor should have a very high resistance to be effective.

Benefits of the RSK2001GP Rectifier Assembly Diode Kit

The replacement diodes and surge suppressor are far more reasonably priced that a rectifier and can be changed easily. A diode is a two terminal electric component that conducts current primarily in one direction. It has a low resistance in one direction and a high resistance in the other. The semiconductor diode, which is the most commonly used type, is a crystalline piece of semiconductor material connected to two electrical terminals. The first semiconductor diodes were developed around 1906 but have been refined and developed into the high quality units used today. These sophisticated units are mostly made of silicon but some are manufactured from other materials such as selenium and germanium. These units are in effect a failsafe to prevent expensive damage to more costly components. Order an RSK2001 diode kit from Generator Parts today.

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YMD-003 VARISTOR BLACK

Tracy Eray — Mon, 19 Feb 2018 14:59:59 +0000

The varistor is an electronic component that has an electrical resistance that varies with the applied voltage. It is known as a voltage dependent resistor and it has a nonlinear, non-ohmic current voltage characteristic that is similar to a diode but where the diode is either positive or negative the varistor has the same characteristic for both directions of traversing current. Varistors are used as control or compensation elements in circuits either to provide optimal operating conditions or to protect against excessive transient voltages. When used as a protection device it shunts the current created by excessive voltage away from sensitive components.

Characteristics of the YMD-003 varistor black

The most common type of varistor is the metal oxide varistor or MOV. It contains a ceramic mass of zinc oxide grains in a matrix with other metal oxides which is sandwiched between two metal plates which are the electrodes. They are typically used for suppressing line voltage surges. They are specified according to the voltage range that they can tolerate without damage. They have an energy rating in joules, operating voltage, response time, maximum current and breakdown or clamping voltage. The response time of the unit is not standardised but can be slowed down by the induction of component leads and the mounting method. The response time is however regarded as insignificant as they are all measured in nanoseconds.

Uses of the YMD-003 varistor black

Generators, motor relays and transformers represent typical sources of induction transients. Switching inductive loads on or off can generate high energy transients that intensify in magnitude with increased heavy loads. The units are designed and equipped to withstand large amounts of energy and divert this potentially destructive energy away from sensitive electronics further downstream. The black epoxy on a varistor offers improved performance for high tempertures, however stresses above the listed as absolute maximum ratings may cause permanent damage to the device and an enormous voltage surge as in the case of a lightning strike can cause the varistor to melt or even vaporise. Order your YMD-003 varistor black from Generator Parts today.

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YMD-001 VARISTOR

Tracy Eray — Mon, 19 Feb 2018 14:57:33 +0000

The name varistor is a combination of variable and resistor and is only used for non-ohmic varying resistors. The varistor is an electrical component with an electrical resistance that varies with the applied voltage. It is also know as a voltage dependent resistor and it has nonlinear, non-Ohmic current voltage characteristic, which is a relationship between electric current through a circuit, device or material and the corresponding voltage across it, that is similar to a diode. In contrast to a diode however it has the same characteristic for both directions of traversing current. At low voltage it has a high electrical resistance which decreases as the voltage is raised.

Characteristics of the YMD-001 varistor

The varistor is used as control or compensation elements in circuits either to provide optimal operating conditions or to protect sensitive components against transient voltages. When used as protection devices they shunt the current created by excessive voltage away from delicate and sensitive components. The most common type of varistor is the metal oxide varistor. This type of varistor contains a ceramic mass of zinc oxide grains in a matrix of other metal oxides such as small amounts of bismuth, cobalt or manganese, sandwiched between two metal plates which are the electrodes. The boundary between each grain and its neighbour forms a diode junction which allows current to flow in only one direction.

Uses of the YMD-001 varistor

The varistor is primarily used for suppressing line voltage surges. They can fail for two reasons namely a lightning strike where the energy involved is many orders of magnitude greater than the varistor can handle or cumulative degradation. The lightning strike may melt, burn or even vaporise the varistor. The cumulative degradation is caused by surges which occur over time. Each successive surge will weaken the protective capability of the unit. In this condition the varistor is not visibly damaged and outwardly appears functional but it no longer offers protection. Eventually it will proceed into a shorted circuit condition as the energy discharges create a conductive channel through the oxides. Order an YMD-001 varistor today from Generator Parts.

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RSK5001GP Rectifier Assembly Diode Kit

Tracy Eray — Mon, 19 Feb 2018 14:51:58 +0000

This RSK5001GP Rectifier Assembly Diode Kit is manufactured for Stamford Generators and is used on the HCI434, HCI534, HCM434 and HCM534 models. The diode kit is made to fit on the generator ends and contains 3 positive diodes, 3 negative diodes and a surge suppressor. These components are mounted in parallel with the revolving field coil. Once the diode kit is assembled it is attached to the main rotor of the alternator. The unit should be fitted using a calibrated torque wrench as the unit is delicate and needs the correct torque to work efficiently. These units are useful when needing to replace a diode that has blown in a rectifier. As it is often difficult to tell which diode is faulty, replacement of all relevant parts is easiest.

RSK5001GP Rectifier Assembly Diode Kit

In order to determine which diode is faulty the diodes on the main rectifier assembly can be checked with a multimeter. The flexible leads connected to each diode should be disconnected at the terminal end and the forward and reverse resistance for each measured. The rectifier assembly is split into two plates, positive and negative and the main rotor is connected across these plates. Each plate carries 3 diodes, the negative plate carries the negative based diodes and the positive plate carries the positive based diodes. Care must be taken to insure that the blown diodes are replaced with the correct units.

Benefits of using the RSK5001GP Rectifier Assembly Diode Kit

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