Conveyor control cabinets
- Sequence control: section-by-section start against material flow (1–5 s interval), section-by-section stop with material flow
- Interlocked shutdown: if any section faults, all upstream sections interlock and stop; downstream sections can continue to clear material
- Four protection types: belt misalignment switch, pull cord switch, blockage detection, slip (speed) detection
- Drive: direct-on-line / star-delta / VFD selected by section power and process; VFD soft start for long lines
- Components: Schneider / ABB / Siemens / Chint; brand can be specified, or customer-supplied components shipped to our plant
Specifications
The table below covers 80% of factory distribution room cases. Anything outside it we can still build — those are engineered items, quoted separately, with an indicative price the same day.
| Type | Floor-standing as standard; local pushbutton stations (with emergency stop) can be provided at head and tail ends |
|---|---|
| Standard sizes (W×D×H) | 800×600×1800 / 1000×800×2000 mm, expandable by section count, custom build available |
| Enclosure construction | 2.0 mm cold-rolled carbon steel; filter fan for dusty environments |
| IP rating | IP54 standard / IP65 (outdoor or washdown environments) |
| Operator panel | Line start/stop, single-section jog (maintenance), section run indication, faulted section indication |
| Local operation | Head-tail button box with emergency stop; pull-cord switches wired along the line |
| Rated operating voltage | AC 380V / 400V; control at AC 220V or DC 24V |
|---|---|
| Control core | Relay logic (≤4 sections) or PLC (≥5 sections / communications required), selected by section count |
| Drive method | Direct-on-line (short sections) / star-delta / VFD (long lines / steep incline), configured per section |
| Sequence control | Counter-flow start interval adjustable 1–5 s; flow-direction stop interval set by belt clearing time |
| Protection inputs | Belt misalignment (two-stage), pull cord (along the line), blockage (level / photoelectric), slip (speed switch) |
| Safety circuit | Protections and emergency stop run through a safety relay circuit; broken-wire detection wired as series normally closed |
| Communication interface | Modbus RTU / TCP reports section status and fault codes; dry contact simple interface |
| Component brands | Schneider / ABB / Siemens / Chint; customer-supplied components accepted for factory installation |
| Multi-section belt conveyor | Head, tail and intermediate multi-section drives, counter-flow start + interlocked stop, common in mining / aggregates |
|---|---|
| Production line roller type | Zone control by workstation, workstation button interlock and cycle-time linkage |
| Sorting conveyor type | Interfaces with sorter / barcode scanner, section status reported to the dispatch system |
| Long-distance VFD type | Multi-point VFD drives at head and tail + speed synchronization, reducing belt tension |
| Retrofit and section expansion type | Existing cabinet expansion: reuse existing busbar and incoming line, new section circuits and interlocks integrated |
| Assembly standard | GB/T 7251.1 / IEC 61439-1 |
|---|---|
| Interlock verification | Verify sequential start unit by unit, interlocked stop on any section fault, and belt clearing logic |
| Routine tests (every unit) | Insulation resistance, power-frequency withstand voltage, powered simulation of full-line sequence and protection operation |
| Temperature rise | Contactor and terminal connections ≤70 K |
| Documents with shipment | Schematic diagram, section number cross-reference table, I/O point list, BOM, test report |
Five steps to specify your run
A configuration summary is generated as you go. It travels with your inquiry, saving a round of confirmation.
Build details
Systems have been in service for decades, and the failure points are always the same few: poor busbar contact, water ingress at the door seal, high temperature rise in the correction cabinet, and mis-phased outgoing feeders. The six hard rules below are written for exactly these points — every cabinet can be traced to them.
Sequence is hardwired, not operator-dependent
The starting sequence is fixed in the control logic: it starts from the most downstream section and works up section by section, with an adjustable interval; the operator presses one button and the sequence cannot go wrong.
Upstream stops immediately, downstream runs empty
If any section faults, all upstream sections interlock-stop and downstream sections stop in sequence per the run-empty time, so material neither piles up nor jams the line.
Protection wired as normally-closed series
Pull cords, belt misalignment switches and emergency stops are all wired in normally-closed series into the safety relay circuit; a broken wire stops the line — a broken wire is safer than a lost signal.
Cabinet section numbers = field section numbers
Circuits, terminals and indicator lights inside the cabinet are all numbered to match the field section numbers, and a cross-reference table ships with the unit, so maintenance does not require tracing wires.
Timing verified by powering each unit in sequence
At the factory the full line is powered to simulate sequential starting and single-section fault interlocked shutdown, and each timing step is checked off on the test record.
Filtered fan with positive-pressure dust protection
The conveying environment is dusty; a positive-pressure filtered air path inside the cabinet keeps dust out so contactor contacts do not get fouled.
Photos & enclosure construction
Below are photos taken in our own shop — from the complete unit down to the internal busbars and secondary wiring. Every build detail can be checked item by item.
Image key: 01–05 are shop photos (the numbers match the shot list). The line drawing shows the front elevation of the enclosure; dimensions match the specification table above.
Where these cabinets go
These are the routine applications — we can talk scheme and configuration directly. For the industry view, see the industry pages.
Sand and aggregate mine conveyor line
Multi-stage long-distance conveying, VFD soft start plus four types of protection.
Assembly line roller conveyor
Start/stop by workstation zone, interlocked with takt time and station pushbuttons.
Warehousing and logistics sorting line
Zone status reported to dispatch, interlocked with sorter scanning.
Loading and unloading line
Local operator box at head and tail, emergency stop and pull cord run along the line.
In-plant transfer line retrofit
Add zones or replace cabinets on an existing line, reusing existing incoming feeders and busbars.
Packaging and palletizing line
Interlocked with the packaging machine; blockage detection automatically stops the upstream zone.
Commercial terms
Specification dated September 2026; quotations follow this.
| Drawings & design | Free |
| MOQ | 1 unit (5 or more recommended for production) |
| Production lead time | 15-25 days after drawing approval |
| on-time delivery | 98% |
| Warranty | 12 months |
| Loading port | Ningbo / Shanghai, China |
| Component brands | Schneider / ABB / Siemens / Chint |
| Factory visit & dispatch confirmation | Factory visits welcome; finished-cabinet photos and video before dispatch |
| Capacity | 5,800+ units / year |
Documents for your engineering team
Selection manual, outline dimensions and RFQ checklist — for the customer's electrical engineer. All three documents are being organized by product line; download links go live once complete.
Six questions procurement and electrical engineers ask most
Why start against the material flow direction?
Start the downstream zone first so material has somewhere to go as soon as it drops on. If you start upstream first, material piles up on a downstream zone that is not running yet and jams the belt. Shutdown is the reverse: stop the furthest upstream zone first, let downstream zones clear the remaining material, then stop each zone in sequence.
How are pull cord switches laid out?
One side of the line, every 30–50 meters, connected by steel wire rope through conduit. Pulling at any point trips an emergency stop on the whole line or that zone. The pull cord signal goes to a normally closed safety circuit, and a broken (slack) rope must also be reported. Quantity and spacing to be agreed based on belt length and applicable standards.
How do I choose between relay logic and PLC?
Few zones (≤4) with fixed logic: relay logic is cheaper and more durable. Many zones, fault code reporting, takt interlocking: PLC is the better fit. We build both, and we recommend honestly based on zone count and requirements.
Can it connect to a WMS or dispatch system?
Modbus RTU / TCP reserved: zone run status, fault codes, and running hours reported upstream; start/stop commands sent down to zones. Protocol and point list to be agreed at the design stage; we support joint commissioning.
What if the belt is very long and needs drives at both head and tail?
Multi-point head/tail drives with VFDs, synchronized in speed and torque (master-slave control), to avoid a single drive point stretching the belt. Lines with steep incline or uneven terrain must be calculated for belt tension — send us the parameters and we will run the numbers.
Is slip detection necessary?
A belt running empty shows no problem. Once material is loaded, roller slip generates friction heat, and that is the fire risk. A speed switch compares roller speed against belt speed and trips an alarm when the difference exceeds the limit. Strongly recommended for long-distance and inclined lines.
Other cabinet types in the same main circuit
Related products use color-block placeholders for now (product photos not yet complete; they will be replaced together). Internal links will be filled in once live URLs are confirmed.
How this product is applied in the industry
Operating details, cabinet combinations and customization points are covered in the industry application page — go there directly.
Send us your line layout, and we will number the zones to match your site
Send us your line layout drawing or zone list (length / power / protection requirements) and we will provide a sequence control plan free of charge · quote within 24 hours. Direct from the source factory, MOQ 1 unit, 15–25 day delivery, 1-year warranty.
ISO 9001:2015 · CE(LVD+EMC) · CQC · IP65
When you write, include: single-line diagram or primary scheme, switch room layout, load list, and component brand requirements. You do not need complete drawings — capacity and cabinet type are enough to start.