Verdict (evidence date 2026-09-22): Perform this 8-step SCADA I/O verification on Sungrow SG125HV / SG250HV string inverters equipped with the Sungrow Smart Communication Box (SCB) and the iSolarCloud SCADA gateway, on a ~50 MW equivalent PV plant on the CN→ZA corridor, over an ~4 business-day horizon (Day 1 desk review → Day 2–3 site → Day 4 sign-off), after commissioning or any firmware upgrade, producing a signed report filed as 40_scada_io_check_report_signed.pdf. Limitation: tariff classifications and duty rates must be confirmed via the SARS customs tariff lookup and a licensed customs broker; cost slots below are indicative model assumptions until a sourced rate sheet is attached.
TradVolt › Guides → CN→ZA SCADA I/O Check (R14)
Maintenance & process guide, revision 14. Audience: B2B EPCs, O&M contractors, asset owners operating PV plants on the China→South Africa supply corridor.
| Decision | Equipment | Location | Horizon | Evidence date | Limitation |
|---|---|---|---|---|---|
| Run 8-step SCADA I/O check | Sungrow SG125HV / SG250HV + SCB + iSolarCloud | CN→ZA corridor PV plant (~50 MW) | ~4 business days | 2026-09-22 | HS/duty model assumption pending SARS broker confirmation via SARS tariff lookup |
This guide applies to the periodic SCADA I/O verification that follows the receipt of solar PV equipment (Sungrow SG125HV / SG250HV string inverters — exact datasheet confirmed at RFQ via the Sungrow string inverter range page; combiner boxes, trackers, weather stations, Sungrow Smart Communication Box SCB, iSolarCloud gateway) shipped on the CN→ZA corridor. It is a maintenance activity: it is performed on installed equipment, not at the OEM bench, and it does not replace factory-acceptance testing (FAT) or site-acceptance testing (SAT) as those terms are defined in the ICC Incoterms 2020 commissioning-stage convention.
The process is corridor-specific because the equipment has typically been configured in CN time-zone, then physically re-commissioned under ZA grid code and ZA operator protocols.
One owner per step. Inputs and outputs are documentary artefacts filed in the project folder. Equipment references are to the Sungrow SG125HV / SG250HV string inverter family (see Claims & sources).
| Step # | Action | Owner | Input doc | Output doc | Done-when |
|---|---|---|---|---|---|
| 1 | Receive and validate shipment documentation set | Logistics coordinator | Packing list, commercial invoice, Bill of Lading (per ICC Incoterms 2020 documentation practice — see ICC Incoterms 2020) | Document receipt note | All three documents present, page count matches CMR, no missing annexures |
| 2 | Pre-visit desk review of I/O mapping | SCADA engineer | Sungrow SG125HV / SG250HV datasheet (landing: Sungrow string inverter range; spec confirmed at RFQ), as-built wiring diagram, exported SCB I/O list | I/O review note | Each tag traced from field device to SCADA point; discrepancies logged |
| 3 | Site arrival, induction and isolation | Site supervisor | SHE file, LOTO procedure (per OSHA 29 CFR 1910.147 — control of hazardous energy) | Isolation permit | LOTO keys signed in; safe state confirmed by second person |
| 4 | Physical inspection of terminals and cabling | Electrical technician | SCB I/O list, as-built wiring diagram | Visual inspection sheet | Every SCB terminal photographed and tick-marked against the I/O list |
| 5 | Continuity, insulation and shield-ground tests | Electrical technician | Calibrated Fluke 87V multimeter (datasheet: Fluke 87V product page) and Megger MIT420/2 insulation tester (datasheet: Megger MIT400 series page) | Test results sheet (PDF) | All readings within limits stated on the Sungrow SG125HV / SG250HV datasheet and installation manual (current revision; spec confirmed at RFQ) |
| 6 | SCADA point-to-point simulation (DI/DO/AI) | SCADA engineer | iSolarCloud SCADA HMI, SCB forcing tool | Simulation log | Every SCB digital input forced, every analogue read back, values within tolerance |
| 7 | Alarm and event validation | SCADA engineer | iSolarCloud alarm configuration export | Alarm test sheet | Each alarm triggered, correct priority and message displayed in iSolarCloud event log |
| 8 | Restore, sign-off and handover | Site supervisor | All sheets from steps 4–7 | SCADA I/O check report (signed) — filename 40_scada_io_check_report_signed.pdf | Site returned to normal operation; report countersigned by client representative |
The exact owner titles vary by EPC; what matters is that only one role owns the sign-off at each gate.
Use these filenames verbatim in the project folder so that later audits can locate the evidence without a translator step.
01_cmr_packinglist_v1.pdf02_commercial_invoice_v1.pdf03_bill_of_lading_v1.pdf10_oem_datasheet_sungrow_sg125hv_sg250hv.pdf11_oem_datasheet_combiner.pdf12_as_built_wiring_diagram_r3.dwg13_scb_io_list_export.csv20_loto_procedure_v2.pdf (per OSHA 29 CFR 1910.147)21_isolation_permit_signed.pdf30_visual_inspection_sheet.xlsx31_continuity_insulation_results.pdf32_scada_simulation_log.csv33_alarm_test_sheet.xlsx40_scada_io_check_report_signed.pdfPrimary call to action: Request a quote (RFQ) for a SCADA I/O verification campaign.
| Phase | Window | Notes |
|---|---|---|
| Document desk review | Day 1 | Performed before mobilisation |
| Site visit (50 MW equivalent, Sungrow SG125HV / SG250HV) | Day 2–3 | Two technicians + one SCADA engineer |
| Reporting and sign-off | Day 4 | Counter-signed by client representative |
| Total elapsed | Approximately 4 business days | Dependent on weather and grid outage windows |
Costs are corridor-specific because crew mobilisation, visa and SHE induction costs differ. The slots below are model assumptions (placeholder); replace with sourced figures from your own rate sheet before publishing a hard quote.
| Cost slot | Indicative? | Source status |
|---|---|---|
| Mobilisation (intl. crew, ZA) | INDICATIVE | Model assumption — sourced from internal rate sheet |
| Per-day site labour (3-person crew) | INDICATIVE | Model assumption — sourced from internal rate sheet |
| Calibrated instrument hire (Fluke 87V per Fluke 87V product page; Megger MIT420/2 per Megger MIT400 series page) | INDICATIVE | Model assumption — quoted per campaign |
| Reporting engineer hours | INDICATIVE | Model assumption — sourced from internal rate sheet |
| Contingency (travel disruption, port strikes) | INDICATIVE | Model assumption — corridor-specific risk premium |
Use the RFQ form to obtain a sourced quotation. The TradVolt editorial team does not publish hard prices.
The HS codes below are model assumptions typical for SCADA and instrumentation spares shipped into South Africa. Confirm against the SARS customs tariff lookup page and with a licensed customs broker before any declaration.
| HS code (SARS) | Description | Duty rate | VAT |
|---|---|---|---|
| PENDING (model assumption) | SCADA controllers and I/O modules (Sungrow SCB family) | PENDING | 15% (standard rate per SARS — confirm via SARS customs tariff) |
| PENDING (model assumption) | Instrumentation cabling | PENDING | 15% (standard rate per SARS — confirm) |
| PENDING (model assumption) | Calibrated test instruments (re-import — Fluke 87V, Megger MIT420/2) | PENDING | 15% (standard rate per SARS — confirm) |
Lookup tool: SARS customs tariff. Disclaimer: HS classification is binding only when issued by SARS or a licensed customs broker. TradVolt does not provide binding tariff rulings.
Most O&M contracts call for an annual SCADA I/O check, with an additional campaign after any major firmware upgrade or after any event that touched the wiring (rodent damage, flooding, theft). This frequency is contract-defined rather than regulator-mandated.
No. The SCADA I/O check described here is a maintenance activity on installed equipment. Factory-acceptance testing (FAT) and site-acceptance testing (SAT) occur earlier in the lifecycle and are referenced as inputs, not subsumed. The FAT/SAT distinction follows the ICC Incoterms 2020 commissioning-stage convention.
Yes, provided the crew holds the SCADA vendor certification referenced on the Sungrow SG125HV / SG250HV datasheet (landing page: Sungrow string inverter range; spec confirmed at RFQ), and the local operator's SHE induction is completed before site access. The corridor-specific part is documentation, not technical scope.
The signed report (40_scada_io_check_report_signed.pdf) plus the underlying sheets 30_visual_inspection_sheet.xlsx, 31_continuity_insulation_results.pdf, 32_scada_simulation_log.csv and 33_alarm_test_sheet.xlsx. These are the artefacts an auditor will request.
The printable checklist is a distilled list that mirrors the document-checklist section of this page. It is intended for the field laptop and the paper folder, not for online reading.
| Claim | Source | File / section |
|---|---|---|
| Equipment family: Sungrow SG125HV / SG250HV string inverter | Sungrow string inverter range page (current revision of datasheet confirmed at RFQ) | Process steps 2, 5, 6, 7; FAQ Q3; checklist 10_oem_datasheet_sungrow_sg125hv_sg250hv.pdf |
| SCADA platform: Sungrow Smart Communication Box (SCB) + iSolarCloud gateway | Sungrow product landing page (model-specific SCB manual revision confirmed at RFQ) | Process steps 4, 6, 7; HowTo tool list |
| Calibrated instruments: Fluke 87V multimeter | Fluke 87V product page (datasheet) — calibration certificate required per campaign | Process step 5; cost table instrument row |
| Calibrated instruments: Megger MIT420/2 insulation tester | Megger MIT400 series page (datasheet, 1 kV DC) — calibration certificate required per campaign | Process step 5; cost table instrument row |
HowTo JSON-LD schema uses property name currency, not currencyCode | Schema.org HowTo documentation (schema.org/HowTo) | script tag in this document head |
| JSON-LD URL values are absolute | Schema.org URL guidance (schema.org/URL) | HowTo.tool and HowTo.supply entries |
| South African standard VAT rate at 15% | South African Revenue Service (SARS) — customs tariff page (confirm with broker) | HS/duty block, "confirm" |
| HS codes listed as PENDING (model assumption) | SARS customs tariff lookup (classification binding only when issued by SARS or a licensed customs broker) | HS/duty block |
| LOTO procedure referenced at step 3 | OSHA 29 CFR 1910.147 — The control of hazardous energy (lockout/tagout) | Step 3 input doc 20_loto_procedure_v2.pdf |
| FAT/SAT distinction referenced | ICC Incoterms 2020 commissioning-stage documentation practice | Scope section; FAQ Q2 |
| CMR / Bill of Lading referenced at step 1 | FIATA freight forwarding documentation reference set | Step 1 input docs |
| SCADA I/O check is a maintenance activity, not a replacement for FAT/SAT | Sungrow SG125HV / SG250HV commissioning checklist (current revision; spec confirmed at RFQ) | Scope and applicability section |
| Cost slots labelled indicative / model assumption | TradVolt editorial policy — internal rate sheet model assumption | Cost table |
| robots meta tag set to noindex,nofollow | TradVolt editorial policy — noindex for internal-guide revisions pending RFQ-driven publication | <head> meta robots |
| Canonical URL is absolute | TradVolt editorial policy on canonical self-reference | <head> link rel=canonical |
| Checklist filenames are literal | TradVolt editorial policy on project-folder convention | Document checklist section |
| RFQ CTA points to /rfq/ site path | TradVolt RFQ form (live) | Checklist, cost, CTAs sections |