Sparks Electrical News October 2016

CONTRACTORS’ CORNER

16

MILL MOTORS REPAIRED CHOP-CHOP MARTHINUSEN & Coutts, a division of Actom, recently repaired two large mill motors for leading uranium producer, Rössing Uranium in Namibia.

Craig Megannon, Marthinusen & Coutts’ general manager says the repairs carried out on the two motors consisted of rewind- ing the stators incorporating use of a resin- rich winding system, overhaul of the rotors and complete replacement of the rotors’ electronic diode and synchronising hub. Repair of the second motor was com- pleted at the end of March. In addition to the stator rewind with resin-rich windings, the rotor was overhauled and the quad- rants on a damaged damper winding of

Marthinusen & Coutts’ field service team was requested by Ross- ing to inspect two brush mill motors on site. The team found that the starting cage winding on one of the motors had moved and rubbed against the stator winding, while an insulation test conduct- ed on the second motor indicated that the stator winding was down to earth. This necessitated having both motors repaired at Marthi- nusen & Coutts’ facility in Cleveland. As no spare motor would be available to the mine in the event of a further breakdown while the two spare motors were being attended to by Marthinusen & Coutts in Johannesburg, the first of the two 1 586 kW 3 300 V, 187.5 rpm, brush motors to be repaired was treated with the greatest urgency.

the rotor were replaced. Enquiries: +27 11 607 1700

Alpheus Mtshali, from Marthinusen & Coutts, is pictured with the 1 586 kW 187.5 rpm, 3 300 V, 278 A stator.

Petrol power cutter takes the rough with the smooth

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Wireless

T he new Makita EK8100WS 405 mm indus- trial power cutter is a valuable addition to in- dustries such as construction, road building, civil engineering, emergency services and other ap- plications where there is a need to cut precisely and effectively through concrete, stone, asphalt, steel and other building materials. With the possibility of power outages and load shedding always present, utilising this petrol model makes perfect sense, as work can continue unhindered. The EK8100WS power cutter has been de- signed for continuous heavy duty use. It is per- fectly balanced and weighs only 10.6 kg. The power cutter is powered by a 81 cc engine and features a five-stage, foam-paper-nylon system that uses advanced directional air flow to provide clean air for a better saw performance. It is easy to change the cutting arm position from centre position to flush (outboard) position, allowing for cuts that are directly adjacent to curb edges, walls or directly above the ground. The on- off-choke operating switch is located on one sin- gle lever for added operator convenience. An improved decompression valve and meter- ing spring provides for precise fuel regulation, en- hanced by a microchip controlled carburettor en- gineered to compensate engine timing according to work load. The ignition coil with start support function, stores electrical energy with each pull for a more efficient and easier start up. Operator comfort is taken care of by utilising four vibration-absorbing rubber engine mounts as well as two mass-dampening systems that deliver reduced vibration. The improved exhaust has emissions are achieved with the Scavenging Losses Rejection (SLR) muffler which recyles un- burned fuel vapour and improves fuel consump- tion by up to 15%. The Makita EK8100WS is sup- plied with an abrasive wheel for cutting stone. For further information or your nearest Makita dealer, visit www.makita.co.za or www.facebook. com/MakitaPowerToolsSA

Enquiries: +27 11 878 2600

SPARKS ELECTRICAL NEWS

OCTOBER 2016