SEW‑EURODRIVE DFS56L‑TF‑RH1M‑KK – Forced Ventilation Unit for IEC 56 Motors

The SEW‑EURODRIVE DFS56L‑TF‑RH1M‑KK is, in most cases, a motor‑mounted forced‑ventilation unit tailored for IEC frame size 56 SEW motors (DR/DRN/DR2.. families). From my experience, users choose this when they need full torque at low speed or during frequent start/stop duty where the standard shaft fan doesn’t move enough air. The suffix suggests a build with thermal protection (TF) and a right‑hand cable exit with a prewired ~1 m lead (RH1M). The “KK” variant typically indicates a keyed/plug‑ready cabling style for quick drop‑in replacement.

One thing I appreciate is how these DFS units stabilize motor temperature in demanding conveyor, packaging, and indexing applications. You might notice that vibration and thermal drift come down once the fan is fitted correctly, which tends to extend insulation and bearing life.

Order Placement Process & Guarantees

• Warranty: 365 days
• Lead time: typically 1 week if in stock; no more than one month at the latest
• Payment: 50% advance; balance prior to delivery
• Express options: FedEx, UPS, DHL

Key Features

• Frame‑56 fitment: Designed for SEW IEC size 56 motors, keeping the overall footprint compact.
• Reliable cooling at low speed: Provides independent airflow, so the motor maintains torque without overheating during low‑RPM operation.
• Thermal protection (TF): Typically includes a thermal contact for simple over‑temperature signaling and safer shutdown.
• Prewired right‑hand lead: RH1M variant usually ships with a ~1 m cable, right‑hand exit, making retrofits faster.
• Quiet operation: Forced‑cooling with reduced noise compared with oversized shaft fans in similar duty.
• Easy retrofit: Mounts on the motor fan cover/shroud; minimal tooling; no change to the gearbox or motor rating plate.
• Durable build: IP‑rated housing and fan guard designed for industrial environments (verify exact rating on nameplate).

Technical Specifications

Brand / Model	SEW‑EURODRIVE / DFS56L‑TF‑RH1M‑KK
HS Code	8503.00 (Parts suitable for use with electric motors)
Power Requirements	Typically 230 VAC, 50/60 Hz, single‑phase (confirm nameplate; other voltages may exist)
Dimensions & Weight	Form factor for IEC frame size 56; compact housing; weight ≈ 1 kg (typical)
Operating Temperature	−20 °C to +40 °C (standard duty; higher ranges available on request)
Signal Input/Output Types	AC power input; thermal contact (TF) for over‑temp indication (normally closed/open depending on variant)
Communication Interfaces	None (not a networked device)
Installation Method	Motor‑mounted on fan cover/shroud; right‑hand cable exit ~1 m; standard fasteners
Protection Class	IP54 (typical for DFS size 56; check actual rating on the item)
Compatibility	SEW DR/DRN/DR2.. motors, IEC frame 56

Application Fields

Typically used on low‑speed conveyor drives, small packaging axes, indexing tables, and light machine tools where the motor runs below its nominal fan speed. It’s also a sensible add‑on for servo‑inverter applications with high torque at standstill, or when a VFD runs a standard induction motor at very low frequency for longer cycles.

• Intralogistics conveyors and diverters
• Pick‑and‑place feeders and labelers
• Food and beverage secondary packaging lines
• Small agitators and dosing systems with long dwell times

Advantages & Value

• Reliability: Keeps winding temperature in check, which often extends motor life and reduces unplanned stops.
• Compatibility: Designed around SEW’s IEC 56 motor geometry—no guesswork during fitment.
• Cost control: A fan retrofit is usually far cheaper than upsizing the motor or adding oversized cooling hardware.
• Support: Straightforward wiring and familiar SEW mounting scheme simplify maintenance and spares stocking.

A packaging OEM told us their DRN motor used to trip its thermal switch during extended low‑speed runs; after adding a DFS unit, the nuisance trips dropped dramatically and they kept their original motor size.

Installation & Maintenance

• Cabinet/environment: Ensure free airflow around the motor; avoid blocking the fan guard. Keep ambient within the stated temperature range.
• Mounting: Install on the motor’s fan cover using the supplied fasteners; verify right‑hand cable exit clears nearby components.
• Wiring: Supply the correct AC voltage and frequency; route the ~1 m lead to a protected junction. If TF contact is present, wire it to the drive or PLC interlock as recommended.
• Safety: Isolate power before work. Use proper strain relief. Confirm rotation direction and airflow after energizing.
• Routine care: Inspect quarterly for dust buildup; clean the guard and impeller with dry air. Check fan noise/vibration, and verify the thermal contact functions during scheduled maintenance.

Quality & Certifications

• Conformity: CE marking; RoHS compliant (typical for SEW auxiliaries)
• Regional approvals: UL/CSA recognition may apply depending on the exact variant
• Manufacturer warranty: 365 days (replacement/repair per our standard terms)

Recommended Supporting Components

• SEW DRN.. IEC 56 motors – common pairing with the DFS56L for low‑speed duty.
• Motor temperature sensor (TF/TH) – integrate with your VFD or PLC for controlled shutdowns.
• Cable gland/connector kit (KK‑style) – for secure, keyed connection in high‑vibration areas.

Note: The DFS56L‑TF‑RH1M‑KK designation appears to define a forced‑ventilation unit for SEW IEC 56 motors with thermal protection and right‑hand, ~1 m lead. Minor variations exist by region and build. For critical projects, we recommend confirming the exact voltage, IP rating, and TF contact type against the item nameplate or the SEW datasheet.