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This fan subassembly provides forced-air cooling for SIMATIC S5 chassis. The Siemens 6ES5981-0HA11 mounts underneath the S5 rack enclosure. You can install this unit to prevent overheating in warm environments. Its reliable design ensures continuous operation for many years.
Physical Dimensions and Hardware Layout
The Siemens 6ES5981-0HA11 measures 48.0 cm in overall width. Its total depth reaches 22.0 cm with a height of 4.5 cm. This fan subassembly weighs approximately 1.20 kg. A metal housing protects the fan motor and blades. Four rubber mounting feet reduce vibration transfer to the rack. A 2‑meter power cable connects to the 24V DC supply.
Fan Specifications and Airflow Performance
This subassembly contains one high‑speed axial fan unit. The Siemens 6ES5981-0HA11 delivers 85 cubic meters per hour of airflow. The fan rotates at 2800 RPM under normal operation. Built‑in electronic commutation reduces electrical noise. The unit draws air from the bottom and exhausts through the rear.
| Parameter | Specification |
|---|---|
| Product Type | Forced-air cooling subassembly |
| Number of Fans | 1 |
| Fan Type | Axial, brushless DC |
| Airflow Rate | 85 m³/hour (50 CFM) |
| Fan Speed | 2800 RPM |
| Supply Voltage | 24V DC ±15% |
| Current Draw | 350 mA typical |
| Power Consumption | 8.4 W |
| Dimensions (W x D x H) | 480 mm x 220 mm x 45 mm |
| Weight | 1.20 kg (2.65 lbs) |
| Power Cable Length | 2.0 meters |
| Connector Type | 2‑pin female (mates with S5 backplane) |
| Mounting Type | Under‑rack (screw or clip) |
| Number of Components | 1 fan motor, 1 impeller, 1 housing |
| Internal Energy Storage | 220 µF capacitor for startup |
| Bearing Type | Ball bearing |
| MTBF | 40,000 hours |
| Noise Level | 48 dBA at 1 meter |
| LED Indicator | None |
| Operating Temperature | 0°C to +60°C |
| Protection Class | IP20 |
Energy Storage and Startup Behavior
A 220 µF capacitor provides extra startup current for the fan motor. The Siemens 6ES5981-0HA11 draws higher current only during the first second. The fan reaches full speed within 3 seconds of power‑up. This soft‑start feature prevents voltage drops on the 24V supply line.
Installation and Mounting Guidelines
Mount the fan subassembly under the SIMATIC S5 rack. The Siemens 6ES5981-0HA11 attaches using four M4 screws or spring clips. Connect the 2‑pin cable to the dedicated fan power port. The rack backplane provides the necessary 24V DC supply. Ensure proper airflow clearance of at least 5 cm below the unit.
Maintenance and Replacement Indicators
The ball bearing design requires no regular lubrication. Listen for unusual noise as an indicator of bearing wear. The Siemens 6ES5981-0HA11 provides no electronic speed monitoring. Replace the unit when airflow noticeably decreases. Always disconnect power before removing the fan subassembly.