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Common Issues
Interlingo

The most frequent operational issues are grouped by functional area. Each issue includes symptoms, causes, diagnostic steps, and resolutions.

System Startup Failures

Startup failures often occur during commissioning, after firmware updates, or following a power outage.

Typical Symptoms:

  • Controllers do not power on.

  • Controllers stuck in reboot loop.

  • HMI displays “System Offline.”

  • SCADA connection fails at boot.

Symptom

Likely Cause

Diagnostic Step

Resolution

Controllers not powering on

Low DC supply voltage

Measure input with multimeter

Ensure ≥ 24 V DC, check breakers and cabling

Continuous reboot cycle

Firmware mismatch

Compare versions with sg_status

Update all units to same certified release

HMI shows “Offline”

Safety interlock engaged

Inspect emergency stop & relay continuity

Reset E-stop, replace relay if faulty

No SCADA link after boot

Network misconfiguration

Ping controller IP, check subnet

Correct IP settings, verify firewall ports

Always power down and discharge capacitors before handling controller modules. Live servicing can result in electric shock.

Energy Optimization Issues

Optimization failures may result in higher energy costs or reduced system efficiency.

Key Scenarios:

  • Peak shaving not activating.

  • Renewable inputs ignored.

  • Unintended load shedding.

Symptom

Possible Cause

Resolution

Peak demand charges remain

Optimization disabled

Enable “Peak Shaving” under dashboard Energy Settings

Solar/wind input not used

Sensor calibration error

Recalibrate CTs and voltage sensors

Loads disconnected unexpectedly

Demand thresholds too strict

Adjust parameters to align with site load profile

Test optimization settings in Simulation Mode before applying changes to live systems.

Load Balancing Instability

Load balancing ensures equitable distribution across controllers and feeders. Instability may manifest as power fluctuations, oscillations, or uneven loading.

Checks to Perform:

  • Verify NTP synchronization across all PCUs.

  • Inspect communication latency on site network switches.

  • Review harmonic filter health and grounding connections.

Resolution:

  • Re-establish time synchronization using NTP.

  • Replace failing Ethernet switch hardware.

  • Service or replace faulty harmonic filters.