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Transformers are used to change the voltage in alternating current circuits A step-up transformer increases the voltage, a step-down transformer decreases the voltage Electromagnetic induction is used to transmit the energy from the input (primary) side of the transformer to the output (secondary) side of the transformer (Figure 914) Because the two windings of a transformer are not directly connected, the transformer provides isolation, that is, it protects the load from noise on the line and protects the line from noise produced by the load An isolation transformer may have the same input and output voltage Transformers may also have multiple windings to allow a single input to produce multiple output voltages Transformers come in a wide variety of sizes, from the very small (as used in control systems) to very large (to drop kilovolt line voltages down to the 480 or 120 VAC used in the building) Transformers are rated according to their maximum power-handling capacity This value is given in volt-amperes (VA) A typical low voltage transformer used for an actuator might have a rating in the 100 VA range (Figure 915) while a large, whole-building transformer is in the 1000 kVA range or larger (Figure 916)
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FIGURE 914 Transformer
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Transformers only work with AC voltages Use a voltage divider on a DC circuit if you want to provide a stepped-down voltage to a sensor
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FIGURE 915 750 VA Transformer
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Most electronic valve and damper actuators use a dedicated 24 VAC or 48 VAC transformer for power You should use a separate transformer for each actuator There are two reasons for this, the first being that of reliability: if the transformer fails, you lose only one actuator rather than many that might be connected to that transformer The other reason is a bit more obscure and has to do with floating versus grounded transformers When working with transformers, remember that there is no physical connection between
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If a modulating electronic actuator moves on its own or does not respond properly to the control signals, check to make sure that it has a floating transformer
HVAC Electricity and Wiring
FIGURE 916 750 kVA Transformer
the primary and secondary side You can therefore reference the secondary to any arbitrary ground, or not attach it to ground at all In the latter case, this is called a floating transformer Figure 917 shows the difference between a grounded and floating circuit Many actuators expect to see a floating circuit If you power more than one actuator with a single transformer, each actuator will be referenced to the others and the circuit will not strictly be floating Note, however, that most large motor and fan secondary circuits are grounded, primarily for human and equipment safety reasons In these cases, the ground should never be defeated by switches, circuit breakers, or fuses
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FIGURE 917 Floating (top) versus grounded (bottom) transformer circuits
Circuit Breakers and Fuses
Practically all electronic equipment, whether DC or AC, is protected by circuit breakers, fuses, or some combination of the two Circuit breakers are usually found in a breaker panel or a motor control center and can trip out when the current goes above a certain level or the breaker temperature gets too high In both cases, the purpose of the breaker is to cut power to a device to prevent damage from too high a current flow Breakers are generally resettable, meaning that you can close the circuit again once the breaker has tripped Some circuit breakers, particularly in residential applications, are ground fault interrupts (GFIs) These kinds of breakers measure not only the current heading to the appliance on the hot lead, but also the return current on the neutral Any difference between the two implies that there is a path for the current other than the desired electrical circuit If this occurs, the breaker will trip off These kinds
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