December in the Maintenance Department is usually a month of two speeds. On the one hand, there is immense pressure to meet annual production targets, where every minute of unplanned downtime counts triple. On the other hand, there's the looming prospect of the much-desired Christmas and New Year break.
In many plants, this winter shutdown is treated as a time for a major cleanup: oil changes, lubrication, cleaning machines of year-round grime, and performing overdue minor repairs for which there was never enough time. These are important tasks, but are they sufficient?
If we treat the production break only as a time to catch up on operational backlogs, we are wasting the most valuable resource available to Maintenance, which is time without production pressure. This is one of the moments in the year when we can move from reactive to strategic actions and look where we are usually afraid to look, so as not to jinx an operating line. This is the moment to turn the dead season into an insurance policy for the coming January.
What will a routine inspection not detect?
One of the biggest challenges in modern maintenance is not mechanical failures, which are usually visible or audible, but the insidious degradation of industrial electronics and automation. These are processes that happen quietly, often inside control cabinets, which look impeccable from the outside.
A machine that is still operating in mid-December may actually be on the verge of critical failure. There are components whose wear cannot be assessed by eye during a routine inspection.
Let's look at a few technical examples:
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Key high-power servo drives and inverters operate continuously throughout the year.
Inside them, in the DC Bus, large electrolytic capacitors operate. Due to temperature and time, the electrolyte in them slowly dries out, which is a natural and inevitable process. As long as the machine is powered, the system often masks the decrease in capacitance of these components. The problem arises when the machine is turned off for two weeks during the holidays, and the dielectric layer in old capacitors degrades without polarizing voltage. An attempt to start in January then ends either with an immediate inverter error or spectacular damage to the power stage. Without measuring capacitance and equivalent series resistance, their real condition cannot be assessed. -
In winter, when it is cooler in the hall, the efficiency of control cabinet ventilation systems seems sufficient. However, often the fans inside the modules themselves (e.g., in power supplies or inverters) are already seized or covered with dust. Routine cleaning of filters on the cabinet doors is not enough. When spring comes and temperatures rise, these neglected components will lead to overheating and cascading failures of key modules.
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Batteries supporting memory in PLC controllers, robots, or CNC units have a limited lifespan. If the battery is running low, a two-week lack of main power to the machine will result in a complete loss of parameters, tool offsets, or even part of the program. Returning to production in January will then begin not with pressing "START," but with a frantic search for backups
and machine parametrization from scratch.
Strategy of in-depth prevention
Since we know that superficial cleaning is not enough, how can we use downtime effectively? The key is to move from general maintenance to deep preventive maintenance based on priorities. It is impossible and pointless to disassemble every machine into its constituent parts.
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machines whose shutdown paralyzes the entire plant.
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equipment older than 5-7 years that operated under the highest thermal and current load in the past year.
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important, complex control systems for which we do not have spare parts on the shelf, and whose failure means weeks of waiting for manufacturer service.
For selected units, routine service is not enough. They require precise measurements and prophylactic regeneration.
When is your own team not enough?
In-house Maintenance Departments are the heroes of the daily struggle for production continuity. However, in the face of the challenges of deep prevention, even the best team encounters barriers.
Firstly, the tool barrier. To assess the condition of electronics, a multimeter is not enough. Specialized equipment is needed.
Secondly, the know-how barrier. Replacing a fan in a cabinet is one thing, but safely disassembling a 200kW inverter, desoldering and measuring capacitor batteries, and then professionally cleaning a PCB board in a washer are tasks requiring specific workshop experience.
Finally, the resource barrier. The holiday season is a time when Maintenance employees also want to take vacations. Implementing an ambitious maintenance plan with a reduced staff is unrealistic.
At this strategic moment, engaging a specialized external partner is crucial. Not as a substitute for the internal team, but as its specialized support. An audit performed by external experts provides Maintenance departments with all information about the infrastructure's condition. This way, your team, returning after the holidays, does not work blindly but focuses its efforts where a real threat has been diagnosed.
Professional regeneration of key modules during downtime, before they even fail, is always cheaper and less stressful than emergency repair in the first week of January, when production must start quickly, reliably, and efficiently.
Treat yourself to a calm January
Planned winter shutdown is a double-edged sword. It can be a time wasted on simulated actions, which will retaliate with a wave of failures upon restart. It can also be a strategic investment that will ensure the stability of the machine park for the coming months. The difference lies in the depth of insight into the technical condition of the equipment, especially those components whose wear is not visible to the naked eye.
If you are unsure which of your key drives and control systems require deep prevention before the upcoming holidays, it is worth consulting
with experts. Sometimes a brief conversation and an external audit can help identify devices most susceptible to January failures and prepare a realistic action plan before the holiday silence falls in the hall.
