8.5‑Ton Heavy‑Duty Rotating Platform for PV Testing | Step Accuracy ±0.5° + Slip Ring

POSTED: 5/6/2026

Visão geral

Project type: Large‑scale heavy‑duty rotating platform (turntable)
Client: Xintu (Jiaxing) Digital Technology Co., Ltd.
Industry: PV testing & digital energy
Key challenges: 8.5m diameter, 8.5‑ton load, step accuracy ±0.5°, ultra‑low speed (0.01‑0.1rpm), 360° arbitrary stop, slip ring integration, MODBUS remote control

Client Background & Industry Pain Point

Xintu (Jiaxing) Digital Technology is engaged in PV power generation testing. The client tests how different solar panel orientations affect power output, providing data for PV tracker optimization and inverter matching. Traditional fixed racks or manual adjustments cannot achieve continuous, precise, automated testing.

This turntable is installed outdoors, carrying PV panels, inverters and cables with a total weight of 8.5 tons and platform diameter 8.5 meters. High rigidity, rotation accuracy, electrical reliability and remote control are critical.

Core Specifications

Parâmetro	Valor
Platform diameter	8500 mm
Carga nominal	8500 kg
Flatness	≤ ±4 mm
Roundness	≤ ±3 mm
Platform height	700 mm
Speed range	0.01 – 0.1 rpm
Step angle	2 – 10° (adjustable, error ≤±0.5°)
Rotation direction	Forward/reverse, ±360°
Response time	≤ 0.5 s
Motor de acionamento	Siemens V90 servo
Controle	Siemens S7 PLC + 12″ touch screen
Communication	MODBUS RS485 + Ethernet
Segurança	Overload relay, emergency stop, smooth start/stop, one‑key reset
Slip ring	Custom (485, 220V, Ethernet, DC lines)
Order date	Jan 26, 2026
Shipment date	Mar 5, 2026 (urgent)

Solução

1. Large diameter & heavy load: 8.5m diameter + 8.5t load

Challenge: Prevent deflection and deformation under heavy load, maintain flatness ≤±4mm, roundness ≤±3mm.
Solução: High‑strength steel frame, reinforced anchor pads connected to client’s embedded base, low profile (700mm height) for low center of gravity.
Advantage: No deformation, smooth rotation, stable platform for PV testing.

2. Ultra‑low speed & high step accuracy: 0.01‑0.1rpm + 2‑10° steps

Challenge: Continuous ultra‑low rotation or step‑by‑step rotation (2‑10°), stop for data collection. Step angle error ≤±0.5°, response ≤0.5s.
Solução: Siemens V90 servo motor + Siemens S7 PLC for closed‑loop control. Programmable speed, step angle, direction; smooth start/stop, arbitrary stop, one‑key reset.
Advantage: Enables automated data collection at precise orientations, greatly improving test efficiency.

3. Slip ring integration: 360° uninterrupted power & signal transmission

Challenge: DC power from PV panels, AC from inverters, 485 signals and Ethernet cables must pass from rotating platform to stationary side without twisting.
Solução: Custom slip ring integrating:

• 485 signal line (2×0.3mm²) for Modbus
• 220V AC power (3×1.5mm²)
• Outdoor Ethernet cable (ø~7mm)
• DC lines (4×4mm²) for PV power
• Input power: 4mm² 220V (3‑wire)
  Advantage: Continuous, reliable transmission of power and data for real‑time monitoring; no cable tangling.

4. Intelligent control & remote communication

Solução: Siemens S7 PLC + 12″ Siemens touch panel with illuminated buttons. Communication: MODBUS RS485 + Ethernet. Functions: programmable step angle/speed/direction, arbitrary stop, one‑key reset, overload protection, emergency stop.
Advantage: Intuitive operation, remote integration with client’s test system.

5. Outdoor environment & urgent delivery

Challenge: Outdoor installation (dust/water protection), urgent schedule (order Jan 26, ship Mar 5, ~38 days including Spring Festival).
Solução: Reliable electrical components (Siemens, Schneider), reinforced anchor pads for wind load, priority production.
Advantage: On‑time delivery meets client’s test plan.

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