屋外用LEDの低温起動：電源とシステムチェック

DOIT VISION エンジニアリングチーム2026年11月12日

“It runs in winter” and “it restarts after a long winter outage” describe different requirements. For an unattended outdoor screen, put the lowest required restart temperature, expected outage duration and available site supply in the quotation request. Then select the power and enclosure configuration against that event.

Define what happens when power returns

A screen already operating generates heat. After a long outage, the cabinet, control box and power supply can approach the surrounding temperature. State whether the display must resume immediately or may warm up before playback. A storage rating answers neither question.

要件	記録するもの
コールドスタート	Starting temperature, duration without power and input conditions
動作条件	Temperature and duty after successful startup
回復行動	Permitted delay, automatic playback and fault indication
受け入れ	Ordered components, measurement points and observed system result

Select the power route for the ordered cabinet

標準スクエア can use the optional Megmeet MCP300WS-4.5A-B. Its power-supply specification allows startup and operation at −40°C. Output depends on the input and thermal conditions; the unit’s nominal 4.5 V, 60 A rating is not available unconditionally across its entire input range.

Square Pro uses the Xingxiu dual-voltage power solution for −40°C startup. That is a power configuration, not a blanket cold-start rating for every complete display. Select Pro if its cabinet or power platform fits the project; a low-temperature requirement can also be evaluated on standard Square.

Square power and module components. A component specification and a complete-display restart test cover different equipment.

Plan the heated-control-box option

For a Pro project with an extreme ambient requirement of −50°C, a thermostatically controlled heater can be added inside the control box. Agree where temperature is sensed, what equipment is energised first and when the controller permits playback. The heater option is a design route; the time until the first stable image is a separate acceptance item.

Verify the screen as installed

Record the final bill of materials, temperature and soak period, supply conditions, controller recovery and first stable image. If the owner requires unattended recovery, repeat the agreed shutdown and restart sequence with the production configuration. Record the result for the assembled system separately from any component-level test report.

FAQ

Does a -40°C operating range prove cold startup?

Operating temperature describes conditions once equipment is running. A cold-start requirement concerns equipment that has been unpowered long enough to cool before supply returns. Specify the starting condition and required recovery behaviour separately. If the contractual requirement applies to the whole screen, request an acceptance record for that configuration rather than relying on the power-supply operating range.

Can standard Square use a cold-start power supply?

Yes. The Megmeet MCP300WS-4.5A-B is an optional power supply for ordinary Square, and its specification addresses startup at minus forty degrees Celsius. Identify it on the equipment schedule so that the quoted cabinet can be checked against the supply and load. The option is distinct from the Xingxiu power arrangement used on Square Pro.

Does a power-supply test certify the complete screen?

A component test establishes what that component did under its recorded conditions. The complete screen also includes receiving cards, controllers, wiring and the enclosure arrangement. Agree a system test if reliable unattended recovery is part of acceptance. Specify whether successful startup means energising the power supply, displaying a test image or resuming scheduled playback automatically.

Is a heater required for every cold-climate installation?

Select heating from the required starting condition and the proposed equipment. For a Pro installation facing minus fifty degrees Celsius, a thermostatically controlled heater in the control box is available for project evaluation. Agree its control sequence and the permitted recovery time. A climate label or city name alone does not define the heating requirement.

How long does a cold start take?

Use the recovery time observed for the agreed screen configuration and test conditions. A power-supply delay measured at a warmer temperature cannot be extrapolated to a deeply cold-soaked screen. Define when timing begins and what counts as recovery: supply available, controller running or the correct campaign visible across the complete display.

What should a restart test record?

Record the exact equipment, input supply, ambient and measured temperatures, time without power, heater state and the observed startup sequence. Include the time and condition of the first stable image and any fault or intervention. This lets the purchaser distinguish an automatic recovery of the complete screen from a successful bench start of an individual supply.

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