A buyer in Lagos called me in March, three weeks after his auto duct line landed. The containers were still sitting in the yard because nobody had sorted the transformer order in time. Nothing was wrong with the machine. The site just was not ready. I have sat through maybe thirty of these installations now, in the Gulf, West Africa, Southeast Asia, South America, and the pattern never changes: the machines arrive fine, and the schedule slips on site-side items nobody put on a checklist.
So let me walk through how a real commissioning goes, what you should prepare before the shipment leaves China, and where the handover usually goes sideways. If you are comparing suppliers right now, this is also a decent lens for judging them, because the quality of their commissioning plan tells you a lot about the quality of the line itself.
Start with power, because that is where most delays live. A mid-size auto duct line 5 with plasma, servo feed, and a flange station typically needs 60 to 100 kVA of connected load with a peak demand around 70 percent of that. The rated voltage on the nameplate might say 380V 50Hz, but what matters is what arrives at the machine terminals. I have measured 340V at the input of a line in tropical Africa during afternoon peaks. VFDs on that line faulted on undervoltage every day between two and five in the afternoon until a stabilizer went in. Ask your supplier for the allowable voltage window in writing. Anything wider than minus 10 percent needs a stabilizer or an on-load tap changer, budget for it before the machine ships, not after.
Compressed air is the second silent killer. pneumatic folding stations, and corner insert drivers all breathe off the same header. A line like this wants 6 to 8 bar at roughly 1.5 to 2.5 cubic meters per minute free air delivery, dried to a pressure dew point around 5 degrees Celsius because plasma torches hate moisture. The classic mistake is one small piston compressor shared with the tire shop next door. When every station fires at once, pressure sags, the plasma pilot arc drops out, and your cut quality turns to garbage at random intervals. Size the compressor for simultaneous demand plus 30 percent margin, and put a receiver tank of at least 500 liters right at the line.
Floors come third. These lines are long, five to fifteen meters depending on configuration, and the leveling feet need a slab flat to about 3 millimeters over any 3-meter span, with concrete strength of C25 or better at 200 millimeters minimum thickness. I once watched a crew in Cambodia spend two days pouring epoxy screed under the anchor positions because the original slab sloped 12 millimeters along the line length. A frame that is twisted at installation stays twisted. Every subsequent alignment problem, the coil wandering on the feed, the flange height varying corner to corner, traces back to that first-day shortcut.
Here is the checklist I hand out before shipment:
| Item | Typical requirement | Why it bites if skipped |
|---|---|---|
| Power supply | Rated voltage ±10%, transformer sized at 120% of connected load, dedicated feeder | Daily undervoltage trips during peak hours |
| Compressed air | 6-8 bar, 1.5-2.5 m3/min, refrigerated dryer, 500 L receiver | Plasma arc dropout, pneumatic station misfires |
| Floor slab | C25 concrete, 200 mm thick, ±3 mm over 3 m | Frame twist, permanent feed and flange misalignment |
| Access | 3 m wide door or open yard, forklift 3 t minimum, unloading space 12 m | Container detention charges, manual handling damage |
| Lighting and crane | 300 lux at work level; jib or gantry hoist 1 t for roll changes | Slow coil changes, back injuries, dropped tooling |
| Consumables on day one | Correct coil width and gauge, plasma electrodes, hydraulic oil, lubricant | Machine sits idle while someone hunts locally |
That last row matters more than people expect. The supplier ships commissioning material with the machine usually, but not two weeks of production coil in every width you plan to run. Order the coil early and store it dry.
A competent two-engineer crew on a standard configuration needs about five to eight working days from container open to acceptance run. Unloading and mechanical assembly take the first two days. The frames are squared and leveled first, then the material path: decoiler, leveler, servo feed, the mechanical stations. Electrical connections follow, and here is where I insist on one habit: re-torque every terminal in the cabinet before first power-up. Sea freight vibration loosens terminals on the best-built cabinets, and a loose neutral or ground shows up later as mystery faults nobody can reproduce.
Day three or four is first coil through. Do not expect product on day three. Expect the crew to run scrap for half a day, checking coil tracking, feed length accuracy against a tape, cut squareness. On a duct production line 3 class machine, cut length accuracy should settle inside plus or minus 1 millimeter at speed before anyone talks about running good material. If your supplier's crew is happy to sign off at 2 millimeters, push back, because that error multiplies across every piece and shows up as gaps at the assembly table.
Day five to seven covers the peripheral stations and the real work: tuning plasma parameters to your local plate, setting flange heights to your gasket and corner hardware, dialing the folding sequence for your most common sizes. Notice what is happening here. The last days are not about the machine, they are about matching the machine to your material, your hardware, and your product mix. This is why commissioning with your actual production coil, not the supplier's demo strip, is worth insisting on in the contract.
Every supplier includes operator training. What varies wildly is whether the training survives contact with real production. My honest observation after years of these handovers: whatever the operators practice during commissioning week sticks for about a month, and then it decays unless somebody owns it internally.
So structure the training in three tiers before the engineers arrive. Tier one, two or three operators, daily operation: coil loading, size changeover on the HMI, plasma consumable change, daily lubrication points, what each alarm means and what to do, and, critically, what not to touch. Tier two, one or two maintenance staff with an electrical background: VFD fault codes, servo alarms, sensor replacement, hydraulic filter changes, how to safely lock out the line. Tier three, your production supervisor: changeover sequences, production logging, first-line troubleshooting, and how to judge cut and flange quality against the acceptance standard.
Two practical tips from hard experience. First, make the trainees do every task with their own hands while the engineer watches, including mistakes. A crew that watched a demonstration can repeat nothing two months later. Second, film everything. The engineer leaves after a week. The videos stay. Any supplier who resists you filming their commissioning process is telling you something about their after-sales confidence. Decent ones point you at their own factory video library and add to it during your install.
Acceptance should be a written, measured event: two hours of continuous running at contract speed on your material, a fixed quantity of finished pieces, measured dimensions recorded, scrap rate recorded, and both parties sign. I have seen acceptance turn into a handshake and a group photo. Three months later the buyer claims the line never held tolerance and the supplier claims it passed. Get the acceptance criteria into the purchase contract: speed, material, tolerance, duration, scrap rate.
After the engineers fly out, a list of small items usually remains: one sensor reading intermittently, a guard that needs adjustment, a software parameter someone wants changed. These need a named owner on your side and a dated punch list agreed before the crew leaves. Suppliers respond well to a shared punch list; they respond poorly to a phone call three months later that opens with everything and nothing.
Insist, in the contract, on English electrical drawings, PLC and HMI program backups on a USB drive, mechanical assembly drawings, and a parts list with item numbers matching the physical labels on the machine. The CNC plasma cutting station alone has a hundred-line consumables and spare list, and you want the part numbers before you need them, not during a breakdown. One plant I know photographed every component with its tag during commissioning and built their own illustrated spare book from those photos. It took their fitter two days and it has paid for itself many times.
Since 2020 a fair share of installations have gone partially or fully remote: the supplier's engineer on video call, your electrician with two phones and a headlamp, boxes of pre-labeled cables. It works, with conditions. Your side needs at least one person who reads electrical drawings and speaks enough shared language. The machine needs a stable 4G or wired internet connection at the cabinet, which costs almost nothing and stays useful for remote diagnostics forever. And expectations need adjusting: a remote commissioning takes half again as long as an on-site one, and the first size changeover will be rougher.
My recommendation for most overseas buyers is a hybrid. Send the engineers for the mechanical assembly and the first power-up, the two highest-risk days, then finish parameter tuning and operator training remotely. That splits the travel cost roughly in half while keeping the expert on site for the part where a mistake damages the machine.
Ask these five questions and judge the answers, not the price. Who exactly comes, and how many years has that crew done this? What is the day-by-day plan, in writing, for your specific configuration? What do they require from your site, in a checklist, with dates? What are the acceptance criteria, numerically? And what happens after they leave: remote support hours, parts shipping, engineer dispatch time? A supplier who answers all five crisply will probably commission your line cleanly. A supplier who answers with brochures will send you a crew that learns on your dime.
Sea freight two to five weeks depending on destination, site preparation which should overlap the shipping, commissioning five to eight working days, then a ramp of two to four weeks to full speed as operators settle in. Plan commercially for the line to reach contracted output about six weeks after the vessel arrives, and you will rarely be disappointed.
Standard practice: buyer pays flights, visa fees, accommodation and local transport; supplier pays wages. Some suppliers include one engineer's travel in the machine price for large lines, so ask. Visa processing time is a schedule risk in some countries, start the invitation letter process as soon as the shipment leaves port.
Yes, for the feeder, grounding, and cable terminations, if they work from the supplier's drawings and the supplier inspects by video before first power-up. What should not be done by local staff is anything inside the VFD and servo drive parameter space during the warranty period, because a wrong parameter set looks identical to a hardware fault later and burns everyone's time.
Power quality, by a wide margin. Undervoltage during peak hours, missing neutral-ground separation, or an undersized transformer. Spend the money on the electrical infrastructure before the machine ships and you remove the most likely reason your new line sits wrapped in plastic.