Upgrading a 500mm IP55 Axial Fan for a -30°C Outdoor Cabinet

Upgrading to a 500mm IP55 Axial Fan for the Outdoors

The customer needed a 500mm IP55 axial fan to mount on a heavy steel panel. Meanwhile, because the equipment sits outdoors, the spec sheet demands a harsh -30°C lower limit and a 60°C maximum. First, the buyer chose a standard fan from our catalog, specifically the base LWAA4D500S-5MEB-18 model. However, this regular unit only offers an IP44 or IP54 rating, which lets too much dust and moisture inside.

Therefore, they asked us for a tightly sealed upgrade. Therefore, the system relies on a 380V, 60Hz three-phase power source, and we must meet a strict airflow target. The 500mm IP55 axial fan must deliver 7370 m3/h. Meanwhile, the noise must stay near the original 72 dB(A) mark.

The physical size serves as a hard constraint. In practice, this square plate measures exactly 665 by 665 mm, while the bolt holes sit exactly 615 mm apart. We cannot change these dimensions. Meanwhile, if we alter the plate, the 500mm IP55 axial fan will not fit the customer’s cabinet.

Furthermore, the motor must run all day. Therefore, this continuous S1 duty requires a tough design. Any new fan must meet strict EN 60335-1 safety rules for their market. In practice, we test our air output to AMCA 210-16 methods. Thus, this step ensures our data matches real-world performance.

Engineering the Sealed Motor Variant

We looked at the base 450W motor. As a result, could we just add rubber seals to it? Our team rejected this simple idea because tight seals block airflow inside the motor casing. Consequently, this trapped air keeps heat locked around the copper coils.

Excess heat quickly ruins the deep groove ball bearings. Meanwhile, furthermore, the customer expects a 30,000-hour L10 life, and a hot 450W motor would fail much sooner. Instead, we chose a larger motor platform. Therefore, we moved to a heavy-duty 500W stator and rotor. This specific engineering choice gave us the LWAA4D500S-5MKB-18-11 model.

Managing Heat and Electrical Draw

The larger 500W motor runs cooler. In practice, it handles the trapped heat from the tight IP55 seals with ease. However, every design choice has a real cost. As a result, the stronger motor pulls more electricity from the rail.

Its nominal current jumps from 0.8 A up to 1.0 A. Therefore, the customer must check their main power panel to see if they need larger contactors. Even so, the bigger motor brings a hidden acoustic benefit. Moreover, the heavier metal casing blocks internal electrical sound much better.

Consequently, the noise drops from 72 dB(A) down to 70 dB(A). Meanwhile, this 2 dB(A) reduction helps the final product pass field noise tests.

Sealing the Stator and Windings

Next, we focused on the ingress protection. Therefore, we installed high-quality mechanical seals to keep out dust and low-pressure water. Our engineers also embedded thermal switches directly into the motor windings. In practice, this thermal protection cuts the power at 150°C.

It then resets when the hot coils cool back down to 130°C. Thus, the Class F insulation stays safe from sudden electrical overloads. Finally, we kept the original five-blade impeller. As a result, the factory uses cold-rolled sheet metal for these blades, and we balance the entire fan to G6.3 standards.

In short, the new fan pushes 7370 m3/h at 1550 RPM. Moreover, it survives brutal weather while fitting the exact 665 mm panel spacing perfectly.

Technical Specifications

The key rows are the 1 A current and the IP55 rating. In short, the slight rise in power draw enables reliable, fully sealed cooling in harsh outdoor conditions. The 70 dB(A) noise level is also critical. Because the cabinet sits near workers, the sound cannot exceed the original 72 dB(A) limit. The S1 duty classification proves the fan will run 24 hours a day without stopping. Finally, the exact 665 x 665 mm panel dimensions mean the customer does not have to cut new metal.

Reference: IEC 60529 covers the test method behind these figures.

Technical Documentation

Download the full dimensional drawing and performance curve PDF. Project engineers need this file to verify the exact 615 mm bolt hole spacing. It also contains the exact P-Q airflow graph for AMCA 210-16 testing.

This catalog image shows the original 450W base model before we upgraded the motor to handle the IP55 thermal load. The old design allowed dust inside, making the upgrade strictly necessary.

Steps to Specify a Sealed Fan for Outdoor Enclosures

Upgrading to a 500mm IP55 axial fan requires careful planning. You cannot just swap an open fan for a sealed unit. * First, review your heat limits. Tight seals stop outside air from cooling the interior of the motor.

You usually need a stronger stator. Moving to a 500W motor stops the internal coils from burning out during non-stop S1 runs. * Next, verify your power panel. A stronger motor draws more amps.

The jump from 0.8 A to 1.0 A requires you to reset your overload protectors. A failure to update the breaker will cause false trips on cold mornings. * Furthermore, measure your metal cabinet. Send your factory the precise square plate width.

Also include the exact space between the drilled mounting holes. This detail guarantees the new fan bolts right onto your existing threaded studs. * Finally, as a maker with CE certification, we produce these tailored IP55 fans in 15 to 30 days. Related:

Axial Fans.

Common Questions About the 500mm IP55 Axial Fan

Browse our axial fans range, the AC axial fans section, or EC axial fans.