Spring 2026 Control Systems Check

As we head into March 2026 here in the Four Corners region, the snow is melting, the dust is starting to blow, and operations in agriculture and mining are ramping back up after winter. For ranchers and farmers running center-pivot irrigation and pump systems, and for mining crews depending on conveyors, crushers, and dewatering pumps, now is the perfect time for a targeted control system health check.

The Four Corners region brings its own unique spring challenges. Late frosts followed by rapid warm-ups create repeated expansion and contraction cycles that stress wiring, terminals, and enclosures. High winds whip up San Juan Basin dust that infiltrates panels, while early thunderstorms introduce surge risks. A single day of irrigation downtime during peak crop demand can easily cost $900 to $2,000 in lost yield for a typical center-pivot system, based on current irrigation industry benchmarks. In mining, even a few hours of conveyor stoppage during startup can ripple into thousands of dollars in lost production and overtime. Following the momentum from our January “New Year Checkups” post, this spring edition zeros in on the equipment that takes the biggest hit from these conditions. Small issues that hide all winter often surface right when you need maximum uptime — during irrigation startup or when production schedules tighten.

At Edwards Automation and Design, we see these spring audits as one of the highest-ROI activities our clients do all year. A few hours of preventive work now prevents days of downtime later.

Here is our practical 10-Point Spring 2026 Control System Health Checklist, tailored specifically for agriculture (irrigation pivots, pumps, and well controls) and mining (conveyors, material handling, and slurry systems):

1. Control Panel Enclosure & Interior Inspection Open every enclosure. Check door gaskets and seals for cracking caused by winter cold. Look for condensation, corrosion on terminals, dust buildup (especially on panels near pivots or haul roads), and any signs of rodents or insects that moved in during the freeze. In the dusty Four Corners environment, this buildup happens faster than most operators realize — clean thoroughly and reseal as needed to prevent future ingress.
2. Tighten All Electrical Connections Freeze-thaw cycles cause expansion and contraction that loosens terminals and lugs. Use a calibrated torque screwdriver on power feeds, control wiring, and ground connections inside PLC panels and VFD cabinets. Loose connections are the #1 cause of intermittent faults in spring startup, especially after months of temperature swings from sub-freezing nights to 60 °F days common around Farmington and Durango.
3. Test and Replace Backup Batteries / UPS Units Cold weather drains battery capacity fast. Load-test every PLC battery and UPS. Replace any unit older than 2–3 years or showing less than 80 % capacity. A failed backup during a spring thunderstorm can wipe out programs or cause unplanned restarts that cascade into hours of lost runtime.
4. Clean or Replace Air Filters and Cooling Fans VFD heatsinks and PLC cabinet fans clog quickly with winter dust and spring pollen. Pull filters, clean or replace them, and confirm fans spin freely. Overheating is the fastest way to take a VFD offline when loads increase — particularly critical for irrigation pumps running longer hours or mining conveyors under heavier spring loads.
5. Calibrate All Critical Sensors and Transmitters Level, pressure, flow, and proximity sensors drift after months of temperature swings. Recalibrate sensors on irrigation pivots, pump dry-run protection, conveyor belt scales, and slurry level controls. Accurate readings keep VFDs running efficiently, prevent equipment damage, and maintain compliance with water-use reporting requirements many local ag operations now face.
6. Download and Review VFD Fault Logs Connect to every Variable Frequency Drive and pull the fault history. Look for over-temperature, ground-fault, or over-current codes that may have occurred during cold-weather attempts to run. Verify acceleration/deceleration ramps are still appropriate for your pumps and conveyors — small adjustments here can prevent nuisance trips once full production resumes.
7. Verify PLC I/O, Communication Links, and Program Backups Test every digital and analog I/O point. Confirm radio, cellular, or Ethernet links to remote RTUs are solid (common in remote San Juan Basin well sites and mine pits). Download current PLC and HMI programs and save dated backups to your secure cloud or local drive.
8. Agriculture-Specific: Irrigation Pivot and Pump Controls
   • Test pivot alignment switches, end-gun solenoids, and pressure transducers
   • Verify pump sequencing, low-pressure shutdown, and dry-run protection
   • Inspect wiring running along pivot spans for wind or rodent damage
   • Flush sediment from lines before full startup (pairs perfectly with control checks) These steps help maintain uniform water application and avoid the costly under- or over-watering that reduces yields in our variable spring weather.
9. Mining-Specific: Conveyor and Material-Handling Controls
   • Test belt misalignment, rip-detection, zero-speed, and emergency pull-cord switches
   • Verify overload relays and motor starter circuits on crushers and stackers
   • Check vibration-induced wear on panels mounted near heavy equipment
   • Confirm sequencing logic prevents startup under blocked or overloaded conditions Early detection here keeps material flowing smoothly and supports MSHA compliance during ramp-up periods.
10. Grounding, Surge Protection, and Full Functional Test Spring thunderstorms are already rolling in. Verify grounding rods and surge suppressors are intact. Run each system through a complete cycle while monitoring current draw, pressures, and cycle times. Document everything and update as-built drawings so your team has accurate records for the busy season ahead.