Showing posts with label Phase. Show all posts
Showing posts with label Phase. Show all posts

Airchannel Helps With R-22 Refrigerant Phase Out

Airchannel is helping companies comply with legislation that phases out and removes the refrigerant R-22 from their compressed-air systems. Under EU Ozone Regulation EC2037/2000, the use of virgin R-22 refrigerant will be banned from the end of this year, as it contains ozone-depleting hydrochlorofluorocarbons (HCFCs). R-22 is used in a range of industries.

From January 2010 to January 2015, recycled HCFCs will be permitted but it is expected that supplies will be limited. For companies using R-22 within their compressed-air system, this could result in a significant operational headache. The likelihood of compressed-air systems using R-22 as a coolant increases significantly for equipment that is more than 10 years old. However, the legislation also represents an opportunity to help resolve two major issues facing industry - the rising cost of energy and environmental compliance.

Andrew Barraclough, national sales manager for Airchannel, said: 'R-22 will be totally phased out from the start of 2015 and relying on recycled HCFC is a risky strategy. 'To minimise the impact on their organisation, both operationally and financially, companies should address the issue as a priority. 'Essentially businesses have three choices. 'If it fits into the legislative timetable, they can run their chilling equipment to the end of its life and then install new technology.

'The alternatives are to remove the R-22 refrigerant and replace it with another compound that is suitable for their current systems and that complies with the legislation, or outright new equipment.' Airchannel has the expertise to make the required changes or advise if new equipment will be needed to comply with the legislation. It has worked with several customers in earlier gas-removal programmes and is now bringing its up-to-date knowledge of legislation and technical solutions to bear on the issue of R-22.

A number of new products have been put forward as potential replacements for R-22, although some require greater pressures that would have major implications for system components and current system designs. With higher-pressure gases there are several potential problems, such as whether the system can sustain the new pressure, requirements for all-new control switches and difficulty of oil changes inside the refrigerant. As a result this may not be a viable option on the grounds of cost.

However, Barraclough believes the phase-out of R-22 should be viewed as an opportunity that will ultimately offer operational efficiency and has the potential to reduce day-to-day energy costs. He added: 'Some companies are using the R-22 issue as an opportunity to review their entire systems, which has become even more important with the recent increases in energy prices.

'Airchannel has looked to improve efficiency and provide overall savings benefits through updating systems, advising of changes in operational practice or, as a last resort, replacement equipment. 'It is very easy for businesses to take their systems for granted. 'But this is an issue that has a deadline and needs addressing to ensure the appropriate action can be taken in time.' Any company in doubt as to the coolant used in its compressed-air system should contact an independent expert to arrange for an assessment as soon as possible.

Three-Phase Soft-Starter Replaces Star-Delta

Carlo Gavazzi has introduced a three-phase motor soft-starter with electronic motor overload protection, which can replace Star-Delta (Wye-Delta) systems with a single, compact module. The RSHL Smart provides complete motor starting functionality in a 45mm-wide unit that can be DIN-rail mounted in limited-space enclosures. Reliability and longevity are guaranteed by an all-electronic low power consumption design and integrated heat sink.

Improved start/stop performance, higher number of start cycles, electronic motor protection, monitoring and diagnostics make the RSHL Smart soft-starter an all-in-one system. Available in 220, 480 and 600V AC versions, it controls and protects three-phase induction motors rated up to 11kW, such as those used in pumps, compressors, fans, hydraulic systems, conveyors and industrial machinery. The unit controls two phases during normal operation, while the third phase is continuously connected to the load.

Soft starting and soft stopping is achieved by controlling the motor voltage and, during normal running operation (<20A), the semiconductors are bypassed by internal electromechanical relays. Operating parameters are adjusted using a selector switch, push switch and dual potentiometers on the front panel. Soft-starting and stopping characteristics can be programmed with nine customisable (time and shape) voltage ramping profiles offering ramp-up times to 20s, initial torque from 20-50 per cent and ramp-down times up to 10s.

A current-limiting starting option is also available. The built-in, manually adjustable electronic overload can be set for either a Class 10 or Class 20 trip characteristic, and for manual or automatic reset. The RSHL Smart soft-starter can also monitor motors for overheating (via a PTC input), phase loss, sequence and imbalance. As well as motor monitoring, the RSHL also monitors itself for overheating and internal failures.

Eight LEDs on the front panel indicate the device status and alarms. In addition, there is an end-of-ramp auxiliary relay, alarm auxiliary relay, and over-temperature protection. All members of the RSHL family carry CE and RoHS marks, are cUL-approved and rated to IP20 against dust and water ingress.