Buck-Boost Transformers Selection Steps
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Low voltage lighting control applications SolaHD buck-boost transformers are designed to supply power to low voltage lighting circuits, control panels or other systems requiring 12, 16, 24, 32, or 48 Volts. When con- nect ed as an insulating transformer (by following the wiring diagram located after the speci cation tables on the inside of the transformer case), the trans form ers capacity matches the nameplate KVA rating.SolaHD buck-boost transformers are also suited for low voltage landscape lighting. They are UL listed for outdoor service and their compact size makes them the perfect solution for providing power to accent lighting applications. Electrical Connection diagrams are shown at the end of this chapter.When using dimmers for low voltage lighting applications, use dimmers on the output of the transformer that are de signed and rated for use with magnetic loads. We strongly recommend contacting the dimmer manufacturer for advice on your speci c lighting ap pli ca tion > E77014 Accessories Surge Protective DevicesՕ .Active Tracking > Filters > Measure the supply voltage with a volt me ter. 1. Input Line Voltage 2. Voltage Required for the Load Check the load equipment to de ter mine the voltage requirement. 3. KVA or Ampere Rating of the Load Find either the load KVA or the load amperage requirements. This information is listed on the nameplate of the load equipment. 4. Frequency Either 50 or 60 Hz. The frequency of the trans form er must match the frequency of the load. 5. Number of Phases Single or three phase line and load must match. (A transformer cannot convert single to three phase.) A common application is to make a single phase connection from a three phase supply by using one phase of the three phase supply circuit. Be careful not to over load that phase of the three phase supply. For buck-boost applications the supply must provide load KVA Ζ not just the nameplate rating of the buck-boost. Refer to the Selection Tables on the following pages. Buck-Boost transformers are small, single phase, dry type distribution transformers designed and shipped as insulating/isolating transformers. They have a dual voltage primary and a dual voltage secondary. These trans form ers can be connected for a wide range of voltage com bi na tions. The most common use is to buck (lower) or boost (raise) the supply voltage a small amount, usually 5 to 27%. Buck-boost trans form ers are in com pli ance with NEC Article 210-9, Exception 1 when eld connected as an au totrans form er.The major advantages of Buck-boost transformers are their low cost, compact size and light weight. They are also more ef cient and cost less than equivalent isolation trans form ers. When con nect ed as an au totrans form er, they can handle loads up to 20 times the name plate rating. A buck-boost trans form er is the ideal solution for changing line voltage by small amounts.When a buck-boost has the primary and secondary wind-ings connected, per rec om mend ed instructions, it becomes an autotransformer. Now only the secondary windings are transforming voltage and current. The ma jor i ty of the KVA load passes directly from the supply to the load. This is the reason buck-boost trans form ers can supply a load with a much larger KVA rating than the nameplate in di cates. > Visit our website at www.solaheviduty.com or contact Technical Services at (800) 377-4384 with any questions. 213 >