DAILY Ex | Ex MACHINERY
7 October 2026 | Head of Operations Edition

DAILY Ex | Ex MACHINERY
7 October 2026 | Head of Operations Edition

Today: the conveyor drive is part of production capacity - and part of the ignition-control chain

A conveyor gearmotor usually enters the morning meeting as tonnes/hour, starts/hour, bearing temperature, vibration, gearbox oil, energy consumption and whether a spare is available. In combustible-dust service, another question belongs beside those: is the drive still operating inside the exact Ex configuration that was assessed?

!!!All items below are part of random selection!!!

Today’s documentation case is an https://www.sew-eurodrive.com/ explosion-protected geared drive, using the manufacturer’s documented R.. gear unit + EDRN.. motor combination as the machinery family and the published EDRE200L4/FF/2GD-b/TF/AL, 22 kW, S1 example to examine the motor certification detail.

REAL MACHINERY DOCUMENTATION CASE

SEW’s EDRN.. Explosion-Protected Gearmotors (IE3, 50 Hz) in ATEX and IECEx, document 27782913/EN, edition 02/2023, lists R.., F.., K.., S.. and W.. geared-drive configurations and explicitly applies the catalogue structure to EDRN.. explosion-protected gearmotors.

The more detailed IECEx operating instructions, EDR..71–315, EDRN63–315 IECEx, show the published EDRE200L4 example on the nameplate section: 22 kW, 1480 rpm, 400/690 V Δ/Y, S1, IP65, Ta −20…+40 °C, marked Ex eb IIC T3 Gb / Ex tb IIIC T120 °C Db and carrying IECEx PTB 11.004/07.

https://download.sew-eurodrive.com/download/pdf/31555454.pdf

That certificate reference applies to the documented motor example. Do not silently promote it into certification of every R..EDRN.. geared-drive configuration.

For the mechanical geared assembly, SEW’s current EU Declaration of Conformity 901070516/EN, dated 8 April 2025, explicitly covers gearmotors consisting of R../F../K../S../W.. and other listed gear-unit series with EDR../EDRN.. motors. It gives Category 2G/2D and 3G/3D markings, including II 2D Ex h IIIC T120 °C Db, with some configurations carrying an X suffix. It cites EN ISO 80079-36/-37 alongside the electrical Ex standards.

https://download.sew-eurodrive.com/download/pdf/90107nn16_EN.pdf

This is important: the motor’s electrical protection and the gear unit’s non-electrical ignition-source assessment are different evidence streams brought together in the machinery configuration.

Public IECEx register verification of IECEx PTB 11.004/07 was not successfully accessible during today’s research, so its current certificate status is not independently verified here. I will not claim otherwise.

OPERATIONAL USE CASE - ILLUSTRATIVE

Imagine an R..EDRN.. drive operating a sugar conveyor.

Production increases conveyor loading. The gearbox ratio is changed during shutdown and later the motor is moved to inverter control to improve throughput.

Mechanically, the conveyor runs beautifully.

Ex question: does the revised motor/gearbox/inverter operating envelope still match the certified/documented configuration?

The nameplate data are not decoration. Ambient temperature, duty, speed, current, thermal protection and Ex marking belong to the operating envelope. An inverter conversion cannot be justified simply because the original motor was “already Ex.”

Operational consequence: engineering verification before modification may cost hours. Discovering afterwards that the drive configuration lacks demonstrated suitability can mean re-engineering, replacement hardware and production downtime.

That is whole-life cost.

REQUIREMENTS WATCH

No machinery-specific regulatory change found today requires an immediate modification to this installed drive.

There is, however, an important new machinery-related international standard: ISO/IEC 80079-38:2026, Edition 2, published 25 September 2026, covering Group I Ex equipment and assemblies forming machinery for underground mines. It replaces the 2016 edition and covers EPL Ma/Mb equipment. This is an international standard — not automatically a legal obligation in every jurisdiction. Its immediate relevance is strongest for specifications, certification strategy and new mining machinery projects.

Also watch IEC 60079-46:2026: the equipment-assemblies standard is presently a pre-release FDIS, with voting 18 September–30 October 2026. It addresses design, assembly, assessment, marking and documentation where individually certified Ex items become an assembly. It is not yet the final published IEC edition.

MISCONCEPTION CHECK

“The motor is Ex certified, therefore the conveyor is Ex compliant.”

No.

Motor → gearbox → coupling → bearings → belt → pulley → sensors → guards → product → dust deposits → installation all introduce different potential ignition mechanisms.

An Ex motor solves the Ex motor problem.

It does not solve the machine.

CSI - CRIME SCENE INVESTIGATION

Imperial Sugar, Port Wentworth, Georgia - 7 February 2008. Historical case.

The U.S. Chemical Safety and Hazard Investigation Board investigation found that the initial sugar-dust explosion most likely occurred inside an enclosed steel belt conveyor beneath sugar silos. The CSB identified an overheated bearing as a likely ignition source; the initial event dispersed accumulated sugar dust and produced catastrophic secondary explosions. Fourteen people died and 38 were injured. The final report was released 24 September 2009.

https://www.csb.gov/imperial-sugar-company-dust-explosion-and-fire/

The CSI clue for Operations is simple: bearing condition + dust accumulation + enclosure can become one ignition scenario.

TODAY’S MANAGEMENT ACTION

Owner: Operations Manager + Reliability/Maintenance.

Choose one hazardous-area conveyor today and trace:

actual throughput → drive nameplate → gearbox → motor certificate → assembly declaration → operating temperature → bearing condition → dust accumulation → inspection history → last modification.

Measure: one conveyor, one verified configuration, zero undocumented changes.

Because an Ex drive should not merely start every morning.

It must remain the same safe machine you believe you are operating.