Electricity + Control May 2018

DRIVES, MOTORS + SWITCHGEAR

Health and Safety MCCs generally present very few health and safe- ty hazards, except when performing maintenance activities. It is vital that companies and their em- ployees are aware of the hazards and take suffi- cient precautions to manage them. Before work- ing on MCCs, maintenance staff should test the equipment to see if it is ‘dead’, follow correct pro- cedures in the O&M manual and wear correct per- sonal protective equipment (PPE). A risk assess- ment and method statement should be produced for each maintenance activity. Intelligent devices Smart controls on the MCC can be incorporated into preventative maintenance regimes by logging, informing and indicating the operator of important information. The operator can interpret this infor- mation to gauge how well the rest of the plant is performing, allowing for predictive maintenance across the rest of the facility. Therefore an intel- ligent MCC can be used to flag up instantaneous problems in other parts of the plant, for example if a fan motor is pulling an unusually high current. This allows the operator to investigate and correct the problem before it leads to a larger failure. Intelligent systems can also store data over a number of days or weeks, meaning trends can be formed and any abnormalities identified well before they cause an issue. This allows more fo- cused PPM regimes to be adopted. It also allows for feedback of results of maintenance activities in that trends should return to normal once they have been completed. Conclusion Planned, periodic inspections, simple visual checks and an up-to-date record of all maintenance and modifications are imperative for MCCs. To take things a step further, companies can use intelligent devices to predict where maintenance is required elsewhere in the plant. Proactive maintenance is key to MCCs meeting the manufacturer’s life ex- pectancy. By ironing out any faults MCCs can run just like the Beverly Clock, which keeps on ticking.

By ironing out any faults MCCs can run just like the Beverly Clock, which keeps on ticking.

should be put in place and how to keep the MCC healthy and in-line with regulations. Companies can use this to plan preventative maintenance, en- suring that all important components are checked. Assessing the situation To find out the condition of the MCC, maintenance staff can conduct several checks. These can be in- trusive or non-intrusive, from simple visual checks to more complex analysis. It is important to make checks to establish the cleanliness, verify any software and check and backup the parameters on programmable devices. These parameters need to be up-to-date with re- cords. Maintenance staff can make visual checks to look for any discolouration or burnt out equip- ment. As MCCs are often tucked away, there is also a danger that vermin can be present. This can cause serious problems with cables or connectors be- coming damaged or even destroyed. Maintenance staff should conduct regular checks on the physi- cal condition of cabling. If problems are identified, steps can be taken to restore the MCC to a good condition. If problems are recurring, it is important to remove the root cause. Restoring the MCC to how it should be is simi- lar to taking a car in for a service. Common maintenance activity includes clean- ing and tidying equipment, cleaning air filtration systems and fans to reduce overheating and re- placing the batteries of backup systems. When a breakdown happens, it is common for maintenance to use a quick fix to get production going as quickly as possible. If previous mainte- nance has been done for a quick fix, this needs to be resolved by restoring everything to the manu- facturer’s specification. The aim of this maintenance is to restore the MCC to its original condition. If any components show wear and tear, these can be serviced or re- placed. If there is a problemwith the MCC, compa- nies can then perform the required maintenance.

Pat McLaughlin is the operations director of Boulting Technology. Enquiries: Kara Doble. Email KaraDoble@boulting.co.uk

Electricity + Control

MAY 2018

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