How to Perform FAT and SAT on Electrical Control Panels

FAT gives the buyer evidence to review before releasing the panel for shipment. SAT gives the site team evidence that it works in the installed system. The contract and approved test plan define the scope, sign-off authority, and criteria for each decision.

For a factory ventilation system or a hospital utility HVAC system, that difference matters. A workshop can simulate a remote permission signal, while the site test can prove that the installed building controls actually send it. Explore electrical control panel components and their functions.

Use the project specification and approved drawings to define the test scope. Gather the panel tag, drawing revisions, bill of materials, I/O list, control sequence, and any PLC, HMI, or drive configuration references that affect testing.

• Define the evidence for each test. An Auto start test can record the request, permission, starter response, and indication the operator sees.
• Assign responsibilities. Agree who performs each test, who witnesses it, and who approves factory release or site acceptance. Give each connection between suppliers or contractors an owner.
• Mark the test stage. Identify what can be simulated at the factory, what must be repeated on site, and what needs installed equipment.

Procurement teams can use the same test list when comparing quotes. For example, ask whether a supplier’s factory test uses a simulated network or the actual controller from another vendor. Then confirm who will supply the site connection, run the interface test, and provide the signed record. That difference can change the scope of site work.

The applicable part of the IEC 61439 series covers verification of low-voltage switchgear and controlgear assemblies. If it applies to your panel, ask for the assembly manufacturer’s relevant verification records. Check the panel category and project specification when agreeing the scope.

Routine verification is the assembly manufacturer’s check on a completed assembly. If a customer witnesses an applicable routine check during FAT, identify where the result is recorded and cross-reference it in the FAT report. This gives the buyer a traceable record for both requirements.

IEC 62381:2024 provides requirements and checklists for acceptance and integration testing of automation systems in the process industry. Keep the assembly verification records and the project’s FAT and SAT reports identifiable as separate deliverables. The approved test plan establishes how each applies to your equipment.

See IEC 61439-1 for low-voltage assembly requirements · See IEC 62381:2024 for automation acceptance testing.

Begin with the approved documents and the panel as built. Record its identification, drawing revision, and the software or drive settings used during the test. If the build has changed, resolve the discrepancy against the project documents before testing the affected function.

1. Review the build. Check specified components, labels, terminals, enclosure, and relevant assembly verification records.
2. Verify the agreed functions. Test local controls, simulated inputs and outputs, alarms, interlocks, and operator indications where included in the approved procedure.
3. Record what will move to site. Document which tests passed on simulation, which interfaces remain to be checked with field equipment, and which issues require correction.

Before shipment, have the authorized representatives review the results against the agreed release criteria. If a test remains open, record its owner and the decision about when it must be closed.

Start by confirming that the installed panel matches the one released from the factory. Check its identification, condition after transport, and the configuration in use. Have qualified personnel review the site supply, field terminations, protective bonding, and required pre-energization records under approved site procedures.

1. Verify installed interfaces. Confirm that field signals and communications reach the intended PLC, drive, HMI, or BMS points. Compare the equipment state with what the operator sees.
2. Exercise the agreed operating modes. Verify the applicable local and remote commands, actual equipment response, alarms, and approved fault or restart behaviour.
3. Close the carry-forward items. Link the site evidence back to the relevant FAT test IDs, including checks that needed the real motor, sensor, network, or process condition.

Use the agreed method for live tests and any safety-function validation. See IEC guidance on electrical and instrumentation loop checks.

Choose checks that match what the panel controls and how the site will use it. An MCC starter, a PLC panel, and a variable frequency drive (VFD) panel each need evidence for different functions.

Record a failed test with its ID, expected result, observed result, and evidence. Assign an owner and agree on the correction. Repeat the affected checks under the approved test plan, keep the original result, and attach the witnessed retest to the same record.

Give planned site checks their own status. A test waiting for a field device is different from a test that was run and failed. At each stage, the authorized signatories can use that distinction to decide what needs to close before release or acceptance.

If the signatories accept an outstanding item under the agreed criteria, record its deadline, responsible party, and any conditions on release or operation. The site team can then see which conditions still apply when the equipment arrives.

At handover, request signed FAT and SAT reports, as-built drawings, relevant PLC and HMI backups or drive settings, and punch-list closure evidence. Confirm that the documents and backups match the configuration the team accepted. Explore control panel troubleshooting and maintenance.