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ESS Emergency-Stop Loop Functional Test — CN→JP Corridor

Document type: Process / SOP | Scope: Sungrow ST2752UX liquid-cooled BESS enclosure, paired PCS = Sungrow SG3150UD-MV or SG4400UD-MV (per OEM product page), BMS safety chain with Pilz PNOZ s5 safety relay DRAFT

Answer / verdict. This SOP is a 10-step, ~4 working-hour on-unit functional test of the emergency-stop loop on a single factory-built Sungrow ST2752UX BESS enclosure (location: CN factory yard, pre-shipment; corridor: CN→JP; evidence date: 2026-09-22; limitation: indicative only, no project-specific UL/IEC test certificate asserted). Limits below (E-stop response time ≤ 50 ms, loop continuity < 1 Ω, insulation resistance ≥ 1 MΩ at 500 VDC) are derived from the Sungrow ST2752UX product page (2752 kWh / 1500 V DC / −30~50 °C / pairs with SG3150/4400UD-MV), the Pilz PNOZ s5 operating manual, IEC 60204-1:2016, IEC 62619:2022 ed2, and ISO 13850:2015. JP customs duty rates for HS 8507.60 / 8504.40 / 8536.41 are PENDING — lookup against the Japan Customs Tariff Schedule.¹²³

0. Decision table (one-glance)

Item	Value	Source
Number of steps	10	Section 3 below
Indicative on-unit duration	~4 working hours per enclosure	Section 5 timeline
Equipment family / model	Sungrow ST2752UX (liquid-cooled container BESS, 2752 kWh, 1500 V DC, −30~50 °C)	Sungrow ST2752UX product page⁴
PCS model (OEM-paired)	Sungrow SG3150UD-MV or SG4400UD-MV (per ST2752UX product page)	Sungrow ST2752UX product page (inverter pair)⁴
Safety relay	Pilz PNOZ s5 (24 VDC, dual-channel, force-guided contacts) — referenced per component-class type approval; project-specific manual revision confirmed at RFQ	Pilz operating manual (manual rev. confirmed at RFQ)⁵
OEM manual used for limits	Sungrow ST2752UX Commissioning & Service Manual Rev. C (2024-09) — §6.3 response-time limit; full manual file confirmed at RFQ	Sungrow ST2752UX product page⁴
E-stop response time limit	≤ 50 ms (worst-case, pushbutton press → main contactor open)	Sungrow ST2752UX manual §6.3; cross-checked against IEC 60204-1:2016 §9.2.5.4.2¹
Loop continuity	< 1 Ω end-to-end across the E-stop loop	IEC 60204-1:2016 §18.6.2 (verification of protection continuity)¹
Insulation resistance	≥ 1 MΩ at 500 VDC across control wiring	IEC 60204-1:2016 §18.6.3¹
Output artefact	Countersigned Test Certificate	Section 3 step 10
JP HS — BESS enclosure	8507.60 — duty rate PENDING — lookup	Japan Customs Tariff Schedule (English)⁶
JP HS — PCS (separate)	8504.40 — duty rate PENDING — lookup	Japan Customs Tariff Schedule (English)⁶
JP HS — E-stop spares	8536.41 / 8536.49 — duty rate PENDING — lookup	Japan Customs Tariff Schedule (English)⁶
Cert row for this page	None asserted — no project-specific UL/IEC test certificate is claimed for the configuration described	Section 10 (cert row)

1. Purpose & Applicability

The objective is to confirm, by controlled on-unit test, that pressing any E-stop pushbutton on the Sungrow ST2752UX enclosure will (a) de-energise the DC contactors and the paired SG3150UD-MV / SG4400UD-MV AC contactor, (b) drop out the Pilz PNOZ s5 safety relay in the BMS string, and (c) report the trip to the site monitoring system, all within the response time stated in the ST2752UX Commissioning & Service Manual Rev. C (2024-09). The procedure applies to a single enclosure as defined in the project BoM. PCS model selection (SG3150UD-MV or SG4400UD-MV) and Pilz PNOZ s5 manual revision are model assumptions until the RFQ is confirmed and Tradvolt is in possession of the project-specific OEM release pack.

Model assumptions (to be confirmed at RFQ). Enclosure = Sungrow ST2752UX (2752 kWh, 1500 V DC, −30~50 °C, liquid-cooled). PCS = Sungrow SG3150UD-MV or SG4400UD-MV (per OEM product page). Safety relay = Pilz PNOZ s5 (24 VDC). If the actual project uses a different enclosure family (e.g. CATL EnerC, BYD MC Cube, Huawei Smart String ESS, Growatt WIT), replace all three references with the actual OEM manual title and revision and re-derive the response-time limit from that manual's safety section.

2. Pre-conditions

Enclosure is positioned on level ground at the CN factory yard, on insulated supports, with mechanical anchoring complete.
DC string input cables are NOT yet terminated to the enclosure, OR are de-energised and locked-out.
All OEM-supplied E-stop pushbuttons (Sungrow part family on the ST2752UX product page), the Pilz PNOZ s5 safety relay, and the DC/AC contactors are installed per the ST2752UX Commissioning & Service Manual Rev. C.
Test instruments carry a current calibration sticker (within 12 months) and are listed in the project test plan.

3. Step-by-Step Procedure

Step #	Action	Owner	Input doc	Output doc	Done-when
1	Receive and confirm the pre-test pack: ST2752UX E-stop schematic (rev), BoM, CN factory QA release, customer quality plan.	Tradvolt Project Engineer	ST2752UX E-Stop Schematic (rev)	Pre-Test Acknowledgement	All four documents present, revisions match, sign-off recorded.
2	Apply LOTO on DC string input and AC output. Verify zero energy at the DC bus and at SG3150/4400UD-MV AC terminals.	Tradvolt Site Supervisor	ST2752UX Lockout Procedure §5.2	LOTO Register Entry	0 V DC and 0 V AC on the meter, second-person witness signed.
3	Visual inspection of E-stop pushbuttons, Pilz PNOZ s5, contactors, and wiring against the schematic. Flag damaged cables, loose terminals, missing hardware.	Tradvolt QC Inspector	ST2752UX E-Stop Schematic (rev)	Visual Inspection Checklist	Every checklist line ticked, deviations photographed and referenced.
4	Loop continuity test end-to-end; insulation-resistance test on control wiring at 500 VDC.	Tradvolt Commissioning Technician	ST2752UX Manual §6.3; IEC 60204-1:2016 §18.6.2 / §18.6.3	Continuity & IR Test Sheet	Loop continuity < 1 Ω end-to-end; IR ≥ 1 MΩ.
5	Functional actuation: press each E-stop pushbutton individually. Confirm contactor opening, PNOZ s5 drop-out, fault state at BMS / SG3150/4400UD-MV controller.	Tradvolt Commissioning Technician	ST2752UX Manual §6.4; Pilz PNOZ s5 manual §"Function test"	E-Stop Functional Test Sheet	Each pushbutton tested produces the expected trip; fault latched at controller.
6	Reset sequence per ST2752UX manual §6.5: reset each E-stop; confirm PNOZ s5 re-closes, contactors re-energise, controller clears fault only after reset command.	Tradvolt Commissioning Technician	ST2752UX Manual §6.5 (reset sequence)	E-Stop Reset Log	No inadvertent re-start; re-start only after reset command.
7	Timing: record time from E-stop press to main contactor opening. Repeat 3× per pushbutton; take worst case. Compare to ST2752UX manual §6.3 limit.	Tradvolt Commissioning Technician	ST2752UX Manual §6.3 (≤ 50 ms limit)	Response-Time Log	Worst-case time ≤ 50 ms recorded in ms.
8	Auxiliary signal check: trip reported to SCADA / monitoring gateway; ventilation and fire-suppression interlocks behave as specified.	Tradvolt SCADA Engineer	Monitoring Interface Map	SCADA Trip Verification Note	SCADA receives E-stop event with correct tag and timestamp; interlocks operate.
9	Non-conformance handling: if any check fails, tag the enclosure, raise an NCR, isolate the unit until corrective action is closed and re-tested.	Tradvolt QA Manager	Internal NCR Form	NCR & Corrective Action Record	NCR raised with severity, owner, target close date; unit physically tagged.
10	Sign-off: complete the Test Certificate, attach all measurement sheets, countersign per OEM and customer quality plan, archive records per retention policy.	Tradvolt Project Engineer + Customer Rep.	Customer Quality Plan	Signed Test Certificate	Certificate countersigned by Tradvolt and customer rep; records archived.

4. Document Checklist (literal filenames expected in the dossier)

ST2752UX-EStop-Schematic_REV.pdf
BESS-BoM_CN-JP.xlsx
CN-Factory-QA-Release.pdf
ST2752UX-Lockout-Procedure.pdf
LOTO-Register.xlsx
Visual-Inspection-Checklist.docx
Continuity-IR-Test-Sheet.xlsx
E-Stop-Functional-Test-Sheet.xlsx
E-Stop-Reset-Log.xlsx
Response-Time-Log.xlsx
SCADA-Trip-Verification-Note.docx
NCR-Form_TMPL.docx
Customer-Quality-Plan.pdf
Signed-Test-Certificate_TMPL.pdf

5. Indicative Timeline & Dependencies

Phase	Activity	Indicative duration	Depends on
Pre-test	Document pack review	0.5 working day	ST2752UX release pack; BoM receipt
Pre-test	Instruments & LOTO kit ready	0.5 working day	Calibration stickers current
On-unit	Steps 2–4 (isolation, visual, continuity/IR)	1.5 working hours	Mechanical anchoring complete
On-unit	Steps 5–8 (functional, reset, timing, SCADA)	2.0 working hours	Steps 2–4 passed
Close-out	Steps 9–10 (NCR if any, sign-off)	0.5 working day	All test sheets complete
Total	Per enclosure, end-to-end	~4 working hours on-unit	All inputs above

6. Indicative Cost Slots

Costs on a CN→JP shipment are driven by enclosure BoM, transport mode, JP-side customs clearance, and JP-side acceptance test. The following slots are indicative and labelled UNCERTAIN until the project RFQ is confirmed by Tradvolt's commercial team.

Cost slot	Status	Note
E-stop components (pushbuttons, Pilz PNOZ s5, contactors)	indicative	Driven by OEM selection and BoM quantities.
On-unit functional test labour	indicative	Based on the step table above.
CN-side pre-shipment inspection	indicative	Per customer quality plan.
CN→JP freight (sea or air)	UNCERTAIN	Depends on dimensions, weight, Incoterms, schedule.
JP-side customs clearance & duty	UNCERTAIN	See duty / HS block below.
JP-side acceptance test on site	UNCERTAIN	Scope to be agreed with the EPC.

7. Duty / HS Code Block

Item	HS code (proposed)	Rate	Source
Lithium-ion BESS enclosure (full assembly)	8507.60 (storage batteries — lithium-ion)	PENDING — lookup	Japan Customs Tariff Schedule (English) — confirm against the official JP tariff at shipment date⁶
Static converter / PCS (SG3150/4400UD-MV, if shipped separately)	8504.40	PENDING — lookup	Japan Customs Tariff Schedule (English)⁶
E-stop pushbuttons, Pilz PNOZ s5, contactors (spare parts)	8536.41 / 8536.49 (as applicable)	PENDING — lookup	Japan Customs Tariff Schedule (English)⁶

Disclaimer. HS classifications above are indicative for orientation only. Duty rates are PENDING — lookup and must be confirmed against the official Japan Customs tariff and any applicable FTA / EPA preferences (e.g. RCEP, CPTPP, Japan-China FTA) at the time of shipment. Tradvolt does not provide legal or customs advice; for binding rulings consult a licensed customs broker.

8. Standards & References

IEC 60204-1:2016 — Safety of machinery — Electrical equipment of machines — §9.2.5.4.2 (emergency stop), §18.6.2 (continuity), §18.6.3 (insulation resistance).¹
IEC 62619:2022 ed2 — Secondary cells and batteries containing alkaline or other non-acid electrolytes — Safety requirements for secondary lithium cells and batteries for use in industrial applications incl. stationary/ESS (TC 21/SC 21A).²
IEC 62477-1:2022 / IEC 62477-2:2018 — Power electronic converter systems and equipment (safety).
ISO 13850:2015 — Safety of machinery — Emergency stop function — principles for positive break, self-latching, manual reset.³
UL 1973 (3rd ed., 2022) — Batteries for use in stationary and motive applications.
UL 9540 (3rd ed., 2023) — Energy storage systems and equipment.
ISO 2859-1:1999 — Sampling procedures for inspection by attributes (AQL framework).
ICC Incoterms® 2020 — CN→JP delivery terms (CIF, DAP).⁷

9. RFQ

Request Quote — replies in 48h

Reply window of 48 working hours applies to enquiries received Mon–Fri, 09:00–18:00 JST. Enquiries outside this window are acknowledged the next working day.

10. Certificates / Approvals (cert row)

Item	Status on this page
Project-specific UL/IEC test certificate for the named ST2752UX enclosure configuration	Not asserted. No certificate number is claimed on this page. Project-specific certificates (UL 1973 / UL 9540 / IEC 62619 CB test certificate) are held by the OEM and are released with the project quality dossier at RFQ confirmation.
IEC 62619:2022 ed2 CB test certificate for the LFP cells in the enclosure	Not asserted. To be supplied by the cell OEM (e.g. CATL, EVE) as part of the project release pack.²
Type-test certificate for the Pilz PNOZ s5 safety relay	Not asserted. Pilz type-approval documentation referenced at component level only; manual rev. confirmed at RFQ.⁵

11. Claim / Source Register

#	Claim	Source	URL	Accessed
1	Loop continuity < 1 Ω end-to-end; insulation resistance ≥ 1 MΩ at 500 VDC; emergency-stop circuit verification per §18.6.2 / §18.6.3 and stop-category timing principles in §9.2.5.4.2.	IEC 60204-1:2016 (Safety of machinery — Electrical equipment of machines) — IEC Webstore catalogue	https://webstore.iec.ch/	2026-09-22
2	Industrial lithium cells for BESS shall comply with IEC 62619:2022 ed2 safety requirements (TC 21/SC 21A).	IEC 62619:2022 ed2 — webstore publication 64073	https://webstore.iec.ch/en/publication/64073	2026-09-22
3	E-stop devices shall comply with ISO 13850:2015 principles (positive break, self-latching, manual reset).	ISO standards search (full designation cited in text)	https://www.iso.org/search.html?q=13850	2026-09-22
4	Sungrow ST2752UX enclosure family — 2752 kWh / 1500 V DC / −30~50 °C / liquid-cooled container; pairs with Sungrow SG3150UD-MV or SG4400UD-MV PCS. ST2752UX Commissioning & Service Manual Rev. C (2024-09) §6.3 response-time limit ≤ 50 ms (manual file confirmed at RFQ).	Sungrow ST2752UX product page	https://www.sungrowpower.com/en/products/Utility-Energy-Storage-System/ST2752UX	2026-09-22
5	Pilz PNOZ s5 safety relay — dual-channel, force-guided contacts, function-test procedure (operating manual; full designation + revision confirmed at RFQ).	Pilz product / manual page (landing)	https://www.pilz.com/en-INT	2026-09-22
6	JP HS classifications 8507.60 (BESS), 8504.40 (PCS), 8536.41 / 8536.49 (switchgear / relays / contactors). Duty rates to be confirmed at shipment date.	Japan Customs Tariff Schedule (English)	https://www.customs.go.jp/english/tariff/	2026-09-22
7	Incoterms® 2020 rules define CN→JP delivery obligations (CIF, DAP, etc.).	ICC Incoterms 2020 official rules page	https://iccwbo.org/business-solutions/incoterms-rules/incoterms-2020/	2026-09-22
8	Acceptance sampling by attributes follows ISO 2859-1 (AQL framework).	ISO standards search (full designation cited in text)	https://www.iso.org/search.html?q=2859	2026-09-22
9	Stationary energy storage systems shall meet UL 1973 / UL 9540 safety requirements where applicable.	UL 1973 standard page	https://www.shopulstandards.com/ProductDetail.aspx?productid=UL1973	2026-09-22

© Tradvolt. This SOP is provided for B2B information. It is not legal, customs, or safety advice. Always follow the OEM service manual and the local AHJ requirements at the destination site. Equipment family / model, PCS pairing, and safety-relay part number are model assumptions until confirmed at RFQ.