EN IEC 60034-23-2019 pdf free.Rotating electrical machines – Part 23: Repair, overhaul and reclamation (IEC 60034-23:2019).
For rail and road traction motors,IEC 60349-1 is used by the manufacturers of these machines.The service centre should also use the information in lEC 60349-1 to ensure the quality of theirrepair, in conjunction with the lEC 60034-23 repair standard.
Where machines have been designed to meet Minimum Energy Performance Standards(MEPS), as in the IEC 60034-30-1 efficiency classes and lEC TS 60034-30-2,they might besubject to legal requirements to maintain efficiency levels.The designs might have been verifiedby third party testing with declared minimum efficiencies shown on the nameplate. It is importantto follow when repairing or rewinding all machines to ensure no degradation of performance.
Current energy efficient motors have to be within a set tolerance of their rated efficiency label.Any repair workshop, manufacturer’s or independent service centre, with a good quality controlsystem,using modern materials and using this standard, can maintain or improve the efficiencyof a machine within the original efficiency tolerances that the machine was designed to meet.
4.5System efficiencies
lf a motor has already been updated to an energy efficient machine, then a repair is often themost environmentally friendly solution to extend the life of the machine,and maintain its ratedefficiency. During the course of a machine evaluation the decision to repair or replace shouldbe considered.
This is often the best time to calculate whether replacement with a new, more efficient machinewould be cost effective.This varies greatly with the number of hours the machine is used andrequires careful specialist consideration. As an example,unregulated pumps, fans,andcompressors might use more energy, depending on how much they are used, due to less slipand the higher speeds of energy efficient motors.The application might be suitable for use witha converter to overcome this problem, or the impeller could be re-profiled.Many machines arealso special due to limitations of size,fit,duty,speed, torque, etc.Consideration should alsobe given to the possible lower downtime and lower carbon footprint of a repair and re-use.
Electric motors are generally very efficient and reliable converters of energy. The majority ofwasted energy and energy losses are often caused in other areas of the driven system such aspumps,piping design, gearboxes, fans and fan ducting, compressors, wiring, transmission etc.All of these items should be looked at as a complete system when looking for energy savings.
4.6Environment and End of life recycling
Environmentally there are many advantages in a service centre handling a machine at, or closeto, the end of its life and environmentally disposing of replaced machines to remove them fromthe system. Where hazardous substances (such as asbestos,PCB, lead, etc.) are identified,suitable measures shall be adopted using best practice to meet legislative requirements on theirremoval and disposal.EN IEC 60034-23 pdf download.