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Variacs

There were 10 questions found in this category: Are there any recommendations for using Using our Variac® variable transformers for light dimming applications? Our Variac® variable transformers are often used for light dimming where electrical noise from common electronic dimmers is a concern. Our variable transformers dim the lights using transformer action and do not introduce any electrical noise and do not cause audible noise at the lamps. ... Are there flux-coupling problems with variable transformers mounted closely? Coupling should be minimal but heating could be a problem - Provisions to allow heat to escape should be provided. Can I vary the speed of my motor with a variable transformer? Many motors can use a variable transformer for speed control. Motors that usually can be controlled by varying the motor voltage:Universal MotorsSeries Wound MotorsTorque MotorsShaded Pole MotorsMotors that sometimes cannot be varied by changing the motor voltage:Split Phase MotorsPermanent Spli ... How can I protect my three phase variable transformer from excessive currents? You may (and it is highly recommended) place a fuse in each phase between the variable transformer and the load. On the models listed the ouputs are terminals #3 on the three coils.One other caution:These units should be connected to a Wye (3 hot wires, a neutral and a safety ground)source. If t ... I have a very old Variac. Which model can be used to replace this variable transformer? The following link will cross reference most models. Variac Cross Reference Most models have the same mounting dimensions. If your model is not listed please contact ISE for assistance. Is any kind of calibration required and/or beneficial for a Variac? We do not consider our variable transformers as devices that require calibration unless they include a digital or analog meter. A variable transformer only provides an output that is a ratio to the input. This is accomplished using transformer action (turns ratios). There really is not anything ... The transformer dials shown on the site indicate from 0 to 100, yet out put is greater than 100v (140v). How does one know the output voltage when in use if not a Digital model? The variable transformer dials are marked as 0-100% of rated output voltage. It is recommended that the dial to be used for estimating the output voltage only. If the voltage needs to be set to a particular value then a separate voltmeter should be used. ISE offers optional digital or analog met ... Variacs and Guitar Amplifiers Variable transformers are used for several purposes with guitar amplifiers. Tubes in amplifiers last longer if voltage is gently increased during power up. The filaments in the tubes are not stressed as much as when power is applied all at once. When the amplifier has not been used for som ... Variacs for my amp! I own an All-Tube (analog power) 100w guitar amp, and have recently been informed of a way to hook up a variac to the amp. By doing this, it allows the player to use the variac a Variable transformers (variacs) are commonly used with various tube type amplifiers and other tube type devices. The primary purpose is to bring the voltage up slowly in order to extend the life of the tubes. Variable transformers have the unique ability to adjust their output voltage without ad ... What is the difference between constant current and constant impedance ratings on Variac variable transformers. Constant Current Rating: This is the continuous rated amperage at any output voltage. Constant Impedance Rating: This is the maximum continuous amperage resistive load at 100% voltage output that the transformer is rated when the transformer is wired for 0 to Input Voltage. This rating does not ...

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