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IN THIS ISSUE New Stockists onboard - Abex Power Special Feature - Energy Saving
Tel : 01254 582345 Fax : 01254 668414 Email : sales@ralspeed.com |
STANDARD FEATURES
Abex is the first stockist to be appointed and hopefully we will have more stockists ‘coming on board’ within the next few months. Several Wholesalers have expressed a desire to become a distributor for our R54 range and we expect some of these to become stockists shortly – watch this space! SPECIAL FEATURE – ENERGY SAVING
Reducing the speed of air conditioning fans or hot water pumps etc can lead to substantial energy savings. Ralspeed can give you good indications of the amount of energy you can save and are willing to undertake surveys to establish your exact requirements. There has been a lot written about energy saving by using the so called ‘Optimising Soft Starts’. At Ralspeed we ALWAYS use by-pass contactors so that the thyristor switching devices are out of circuit once full speed is achieved. This avoids heat loss and harmonic distortion. There is a great MYTH surrounding the AC Induction Motor that it is very inefficient when only partially loaded. In FACT the opposite is TRUE and an AC motor is virtually a constant or fixed efficiency machine. Consider the tables from a well known motor manufacturer – note that these are typical for ALL MANUFACTURERS
From the table it can be seen that the larger kw sizes are the most efficient but in any case the efficiency does not vary much from full load down to half load. Some companies are claiming 15 to 25% savings by using energy optimising soft starters!!! This type of soft starter detects the power factor and reduces the voltage to the motor in order to reduce magnetic losses. This type of soft starter cannot be by-passed as the thyristors need to be left in circuit at all times. EXAMPLE Take the case of a 132kw motor from the table shown. Full Load it is 93% efficient. AT half load it is 90.5% efficient. It is easy maths to see that the efficiency drop is 2.5%. Even if the optimiser could ‘mop-up’ all of that extra loss and take the efficiency back to 93% that is a long way short of 15 or 25% savings!. Add to this the fact that leaving the thyristors in circuit produces a heat loss of 1% of the absorbed power. This means that whatever savings are made during lowload running, needs to be offset by the fact that these switching losses are there all the time the motor is running. There ARE SAVINGS TO BE MADE WITH SOFT STARTERS but more benefit can be achieved by using 2 distinct methods: 1). Underload Turn-off – Many motors in Industry today are running but not ‘producing’. They have simply been left on. Using the automatic load detect circuit on the Torq-master Soft starter can be used to shut down the motor until it is needed. 2). Cyclic Knock-off – there are some air conditioning plants and other applications that can save energy by turning off the motor for say, 10 minutes in every hour. Once the thermal capacity of a building is up to temperature a 10 minute off time would hardly be noticed but the result would be a 12.5% saving in energy usage. PLEASE CONTACT OUR SALES TEAM TO DISCUSS ENERGY SAVING USING MOTOR CONTROL PRODUCTS New Partners / Distributors We are currently seeking additional distributors throughout the UK and overseas. If you are interested please e-mail us at: distribution@ralspeed.com
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As the UK distributor for Peter Electronics in Germany we have been pleased to see an increase in turnover on the new Versibrake and on the Versistart which we have incorporated into our new IP54 Economy range.' 
Energy Saving is very much a ‘hot potato’ these days and Ralspeed have many installations where we have used Variable Speed Technology to gain considerable energy savings.
Ralspeed has a very loyal client base who actively promote our products throughout the UK (including Northern Ireland) and Overseas.