The controller keeps on monitoring the application requirement in a continuous control loop. It then commands the inverter to produce the required voltage and frequency to meet the application requirements. To do this, the controller, comprised of a microprocessor, takes the input signal from the sensor and compares this with a reference signal. It then generates the appropriate control signal for the inverter to vary its output power.

In a typical application, the controller will monitor process parameters such as pressure, flow rate, temperature or liquid level. For example, an oxygen sensor in a boiler provides a signal to adjust the speed of the fan and control the amount of oxygen in the boiler system.

Today’s drives, using microprocessors, semiconductor power switches, and SMDs are now smaller, compact, cheaper, more reliable and efficient. A typical drive will also include a filter to suppress harmonics generated when converting the DC to AC voltage.

How often have you found yourself considering getting some vacuuming done in your home, only to put it off because it’s simply too much physical work and takes too much time? Vacuuming a home, especially a multi-story home, can be an unpleasant and cumbersome chore. If procrastinating about cleaning your home is something you do often, you should consider installing a central vacuum system to make the job much easier. With a central vacuum, you only need to carry a lightweight hose attachment around the house. You then plug it into a local outlet that connects to a central pressurized suction system. You can vacuum the area around the outlet, and all the debris is moved to a single collection point that you can empty at your own convenience.

Putting in a central vacuum in a home is a complex process that requires numerous special tools and knowledge of ventilation systems, so you must have professionals handle the work. To arrange for central vacuum system installation in Needham, MA, install a central vacuum system, the technicians first determine the number of outlets necessary and then place both the outlets and the power unit: i.e. the vacuum itself, which is housed out of the way in the garage or basement. Once the installers have these two different sets of terminal points in place, they install a trunk line that runs from the vacuum through the walls. From this trunk line, they branch off a number of flexible tubes to connect to each outlet. The technicians must run voltage wires along the trunk and the tubes back to the vacuum unit, since the portable cleaning attachment requires electrical power to run.

It is also important for the installers to set up an exhaust system for the power unit. It’s optimal for the vacuum to vent directly through a wall, but if this is not possible because of the placement of the power unit, the installers will instead run exhaust tubes to a roof vent.

Once all the parts are in place, the installers perform a vacuum leakage test to make sure there are no spots along the trunk line or branch tubes where there is any air escaping.

Afterwards, you can start enjoying a cleaner house with much less work. Contact us today to find out more about this and other electrical installations we do in the area.

With the professionals at FB Electrical Services on the job, you can expect to have your central vacuum system installation in Needham, MA complete in a few hours.

Pay as you go electricity plans allow consumers to pay for their electricity in advance. The plan, which uses prepayment meters, helps consumers to monitor and control the way they use electricity. This saves on energy costs.

Keypad based prepaid meters: This meter has a keypad to input the electricity token number. Consumers purchase the credit using a variety of methods. These include visiting the agent, paying through banks or mobile payments in some countries.

Key meter: Consumer uses an electronic key loaded with the tariff information and credit.

One way card system: Uses a disposable card. The user purchases power with a reloadable debit card. The loaded card is then passed near the meter, which has an in-built card reader.

Two-way card systems: Uses a smart card and the meters have a real-time, two-way communication capability. It is one of the most secure, but more complex and expensive methods to implement.

These allow consumers to interact with their meters and query balances using their mobile phones by sending an SMS to a monitoring system. In addition, the user is able to track electricity use by the hour, day, month or annually using the phone or online access.

These smart prepaid meters offer easier top up options. They include online payments or by text, as well as scheduled and auto top-ups.

When using a prepaid meter, the customer must keep track of the remaining credits and replenish to avoid disconnection.

Ensure there is enough credit when going away for long periods. The meter will continue collecting the standing charges even when on no load. Consumers should ensure they have enough credit to last until they return.

Some crooks will take advantage of the consumer’s lack of knowledge and offer them cheaper credits than those bought directly from the utility company. For example, they will sell their credits at half price. This is more common with Key Prepaid Meters and the crooks will usually have master Keys, which they use to top off the consumer’s meter.

If the energy company finds out, the consumer ends up paying twice for their electricity; first to the crook, and then to the energy company.

To avoid falling victim: