INTRALOGISTICS CABLE SELECTION: POWERING AGVS, AS/RS, AND CONVEYOR SYSTEMS

What cable should you use for an AGV, an AS/RS, or a high-cycle conveyor system? Each motion mode inside an intralogistics site benefits from a different cable family. Inside an AGV or AMR mast, the duty cycle is torsion, so the spec is a torsion-rated servo or data cable. For AS/RS rigs and stacker cranes, the duty cycle is continuous drag-chain bending across millions of cycles, so the spec is chain-rated cable with a published bend radius and cycle count. For conveyors, festoons, and trailing runs, the mix of fixed, rolling, and continuous-flex sections means specifying per section rather than per system.

For intralogistics integrators, warehouse automation engineers, and OEM electrical designers across ASEAN, a recurring failure mode in the field is not the cable construction itself but the wrong cable family for the duty cycle. LAPP makes cables AND connectors AND cable management for intralogistics under one engineering programme, covering ÖLFLEX® continuous-flex and torsion families, UNITRONIC® data and bus cables, ETHERLINE® industrial Ethernet, EPIC® field connectors, and SKINTOP® cable glands. This guide walks through the four duty cycles you will meet in a typical site (AGV / AMR, AS/RS, conveyor / festoon, EMI segregation) and where each cable family fits.

What Cable Should I Use Inside an AGV or AMR Mast?

AGV and AMR masts can impose torsion on the dressing pack. When the chassis steers, the cables inside the mast twist around their own axis. A standard flexible cable rated for bend cycles is not rated for torsion cycles, and the conductor strands fatigue at the point of maximum twist long before the rest of the cable shows wear.

The right spec is a torsion-rated cable with a published torsion angle and cycle count from the manufacturer. ÖLFLEX® torsion-rated servo and control cables are constructed with specific lay-lengths and cradle designs that distribute the twist across the conductor bundle rather than concentrating it on one strand. The same logic applies to the data side. Torsion-rated PROFINET or industrial Ethernet (the torsion-rated ETHERLINE® variant) is the spec for the encoder and network lines running alongside the servo cable, with the specific torsion angle and cycle rating taken from the cable datasheet.

The procurement signal is the AGV OEM’s duty cycle specification. If the OEM specifies torsion at the dressing pack, the cable on the BoM has to be torsion-rated. Substituting general-purpose flexible cable saves cost on day one and tends to create warranty exposure later in the duty cycle.

How Do You Choose Drag-Chain Cable for AS/RS and Stacker Cranes?

AS/RS shuttles and stacker cranes run cables through high-cycle drag chains across the service life of the rig. The duty cycle is well-defined: bending around the chain’s published radius, at the cycle rate of the rig, repeated for the years the rig is in service. The cable spec follows from the duty cycle, not the other way around.

Three numbers matter, and all three come from the cable datasheet:

• Minimum bend radius (typically expressed as a multiple of cable diameter)
• Continuous-flex cycle rating (typically published in the millions of cycles for chain-rated construction)
• Travel speed and acceleration limits

ÖLFLEX® CHAIN families and equivalent continuous-flex cables are constructed with high-strand-count conductors, lay-lengths designed for repeated bending, and jackets that resist abrasion in the chain. Standard flexible cable is typically not specified for a long-running AS/RS chain. IEC 60228 covers conductor standards but does not specify chain life; that figure comes from the cable manufacturer’s published rating.

The Mar Q1 cycle covered an adjacent specification angle in the Intralogistics Connectivity for AS/RS and AGVs blog. The procurement pattern for repeat builds (multiple identical AGVs or AS/RS rigs) often pre-assembles the chain as a unit; LAPP’s Pre-Assembled Cable Chains service handles that side.

Conveyors, Festoons, and Trailing Cables: Where Standard Flex Falls Short

Conveyor lines mix three duty cycles on the same run. Fixed sections sit in tray and do not move. Rolling sections handle short-distance traverses (positioning, transfer, sorting). Trailing or festoon sections carry continuous-flex duties at the gantry or crane interface. Specifying one cable for all three either over-specifies the fixed sections (cost) or under-specifies the trailing sections (failure).

The honest specification is per section. Fixed sections take general-purpose industrial cable with the right voltage and EMC class. Rolling sections take flex-rated cable with a moderate cycle count. Trailing and festoon sections take chain-rated or continuous-flex cable with the high cycle count and abrasion-resistant jacket.

Cable management hardware matters as much as the cable itself. SKINTOP® cable glands at the entry to enclosures preserve the IP rating and resist vibration loosening. Pre-terminated cable assemblies or harnessing through LAPP Harnessing Solutions can replace per-station termination on repeat conveyor lines, removing the variability that field termination introduces.

How Do You Stop EMI Between Servo Drives and Encoder Lines?

Intralogistics throws variable-frequency drives, servo amplifiers, and high-current motor cables alongside low-current encoder, safety, and data lines. The EMI coupling shows up at exactly the wrong time: during peak throughput, when the drive is doing real work and the data line is carrying the most traffic.

The fix is segregation plus shielding. The IEC 61918 industrial network installation standard covers separation distances for power versus signal cables in industrial environments. Shielded servo cable (ÖLFLEX® SERVO with proper shield termination) carries the drive output and helps reduce radiated emissions to neighbouring data lines. Shielded data and encoder cables (UNITRONIC® or ETHERLINE® shielded variants) carry the signal with improved immunity to radiated noise from neighbouring drives. Both shields have to be terminated to ground at the connector body, not left floating, or the shield acts as an antenna instead of a barrier.

Where bus-bar or VFD-power runs cannot be physically separated from data lines, S/FTP-shielded data cable with EPIC® shielded connectors and 360-degree shield termination is the practical answer. The shielding scheme is only as good as the termination, so the procurement spec has to include the connector body and gland alongside the cable.

Talk to Our Engineers

Intralogistics cable selection is a per-section decision (mode, duty cycle, EMI environment, termination), not a single-cable-for-the-whole-site exercise. The LAPP SEA intralogistics team can sit with your AGV OEM, your AS/RS integrator, and your panel builder and walk the BoM section by section before the cable goes in the chain.

Talk to our engineers about your intralogistics cable specification, an existing-run audit, or any specific drag-chain or torsion-cycle question.