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Mitsubishi HC-SFS52 | MELSERVO J2S AC Servo Motor — 0.5 kW / 2000 rpm / 17-Bit Absolute Encoder

Part Number: HC-SFS52

Manufacturer: Mitsubishi Electric (Japan)

Product Type: AC Brushless Servo Motor — Medium Inertia, Medium Capacity

Series: MELSERVO J2S — HC-SFS Sub-Range

Rated Output: 0.5 kW (500 W)

Precision and Durability in One Package

The HC-SFS52 sits in Mitsubishi's HC-SFS medium-inertia, medium-capacity series — the J2S family's choice for applications that need responsive torque across a wide speed range. At 0.5 kW, it serves single-axis applications on packaging machines, conveyor feeders, X-Y positioning tables, and robotic joints where precise positioning and smooth low-speed operation are both required.

The 17-bit absolute encoder (131,072 pulses per revolution) is what sets the HC-SFS series apart from older-generation servo motors. Higher encoder resolution directly translates to finer position resolution and smoother velocity regulation — the drive has more data points per revolution to work with, reducing the "steps" visible in slow-speed motion. Absolute feedback also means the machine doesn't need a homing cycle at power-on; the motor knows its exact position immediately.

The oil seal protects the bearing and shaft from coolant and lubricant ingress in machine tool environments. Combined with IP65 body protection, the HC-SFS52 handles washing-down environments and the dust and coolant mist typical of machining centres and assembly lines.

Key Specifications

FAQ

Q1: The MR-J2S servo drive shows encoder alarm AL.16 or AL.20. Could the motor encoder be the cause?

AL.16 (encoder error) and AL.20 (encoder fault) can originate from the encoder itself or from the encoder cable. First inspect the encoder connector at the motor for secure seating and any bent pins. Then check the encoder cable for damage along its length, particularly near connectors and cable clamps. If the motor has been running in a contaminated environment, the encoder unit inside the motor may have failed — at that point the motor requires encoder replacement or rewinding.

Q2: What MR-J2S servo drives are compatible with the HC-SFS52?

The HC-SFS52 is paired with Mitsubishi MR-J2S servo drives from the MR-J2S-10A through MR-J2S-70A range, with the MR-J2S-10A or MR-J2S-20A being the typical match for a 0.5 kW motor. The correct drive selection depends on the required peak current and the specific servo system's inertia ratio — confirm the motor-drive combination against Mitsubishi's MELSERVO J2S selection guide.

Q3: HC-SFS52 vs HC-SFS52B — what is the difference?

The B suffix indicates the addition of an electromagnetic brake. HC-SFS52 has no brake; HC-SFS52B includes a built-in holding brake for vertical axis applications where the load must be held in position when power is removed. All other specifications — output, speed, torque, encoder — are identical.

Q4: The motor is being replaced after a crash. Should the servo drive parameters be rechecked?

Yes. After a motor replacement, verify the drive's motor ID parameter matches the HC-SFS52 specification. Also check the gain settings — if the rotor inertia of the replacement motor differs from the original (unlikely for a like-for-like swap, but possible if a different model was fitted), the servo loop gains may need retuning to maintain stable positioning performance.

Q5: What does IP65 protection mean in practice for the HC-SFS52?

IP65 means the motor is fully protected against dust (no ingress) and against low-pressure water jets from any direction. It withstands the coolant spray and swarf-laden air of machining centres. It is not rated for submersion or high-pressure washing. The oil seal on the shaft additionally protects the front bearing from liquid ingress through the shaft penetration point.