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Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Harmonic Drive |
| Full Model | FHA-32C-50-H-C1024-SP |
| Product Family | FHA-C H rotary actuator |
| Frame Size | 32C |
| Actuator Design | Integrated brushless servo motor, Harmonic Drive reduction gear, output bearing, encoder, hollow shaft |
| Gear Ratio | 50:1 |
| Motor Winding | H; 680 V DC |
| Motor Feedback | C1024 incremental encoder; verify electrical interface and connector pinout from the exact unit label |
| Maximum Torque | 281 N·m for FHA-32C-H, 50:1 configuration |
| Maximum Current | 6.5 A RMS for FHA-32C-H, 50:1 configuration |
| Protection Rating | Confirm from the full original specification; current FHA-C H family options include IP44 standard and IP65 with option P |
| Brake | No brake code appears in the provided model string; verify the physical unit before use in vertical or suspended-load axes |
| Hollow Shaft | Large central pass-through aperture for routing cables, tubing, or other utilities through the rotational axis |
| Mounting Pattern | 12 × Ø6.6–7.0 mm mounting holes; 16 × M6, 12 mm depth threaded holes |
| Outside Diameter | 162 mm |
| Pilot Diameter | 95 mm |
| Operating Temperature | Verify against the exact special-specification code and installation documentation |
| Special Specification | SP; special-specification suffix requiring confirmation against Harmonic Drive order documentation |
The FHA-C H product family identifies the “H” winding as 680 V DC, the size-32/50:1 version as 281 N·m maximum torque and 6.5 A RMS maximum current. The final SP suffix identifies a special specification, so it is not safe to infer every electrical, environmental, or mechanical detail from standard catalog data alone.
Product Introduction
The Harmonic Drive FHA-32C-50-H-C1024-SP is an integrated hollow-shaft rotary servo actuator for precision motion axes in robotics, semiconductor equipment, indexing systems, packaging machinery, and specialized automation equipment. It combines a brushless servo motor, 50:1 Harmonic Drive gear set, output bearing, incremental encoder, and center-through shaft in one actuator body.
This size-32 actuator suits applications that need compact installation, low-backlash rotary positioning, and utility routing through the center axis. The H winding and C1024 feedback must match the installed servo amplifier, feedback interface, cable assembly, and motion-controller configuration. The SP marking requires exact unit-level verification before substitution.
FHA-32C-50-H-C1024-SP
FHA-32C-50-H-C1024-SP
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Servo drive will not enable | Safety circuit open, missing main/control power, incorrect motor-feedback wiring, drive fault | ❌ Low to medium | Check the drive fault code first; measure the specified DC bus and control supply at the servo drive; verify STO/safety enable circuit | Do not replace the actuator until drive supply, safety chain, and fault history are confirmed |
| Overcurrent or following-error fault at enable | Shorted motor cable, incorrect motor parameters, encoder phasing issue, mechanical jam | ✅ Medium to high | With power isolated, measure phase-to-phase resistance and phase-to-ground insulation; inspect cable for crush damage; rotate the unloaded axis by hand if mechanically permitted | Compare motor and encoder parameters against the original machine backup before replacing the actuator |
| Axis moves in the wrong direction | Motor phase order or encoder direction mismatch | ❌ Usually low | Compare U/V/W and feedback connector wiring with the original installation; command low-speed jog under safe conditions | Correct the drive polarity/direction parameter or wiring; do not force the axis against a hard stop |
| Position drifts or repeatability is poor | Encoder signal issue, loose mechanical joint, backlash elsewhere in the mechanism, incorrect gain tuning | ✅ Medium | Inspect encoder cable shielding and connector retention; review encoder-count diagnostics; check output flange, coupling, and bearing preload | Eliminate mechanical looseness and verify encoder feedback before condemning the FHA actuator |
| Encoder fault appears immediately after power-up | Broken feedback cable, incompatible feedback input, incorrect encoder supply voltage, damaged encoder | ✅ High | Check encoder supply at the actuator connector using the wiring diagram; inspect pins with magnification; substitute a known-good cable if available | Confirm the C1024 feedback interface is compatible with the installed drive before ordering a replacement |
| Servo overheats during normal production | Excess load inertia, over-duty cycle, poor heat dissipation, excessive friction, wrong current limits | ✅ Medium | Trend motor current and temperature through the drive; check machine mechanics for binding; compare duty cycle with the original design | Correct the mechanical load or tuning issue. Replacing a healthy actuator will not solve an overload condition |
| Axis drops when power is removed | No holding brake fitted, brake not wired, vertical load unsupported | ✅ High | Inspect the full nameplate and wiring for a brake option; safely support the load before testing power removal | This model string does not show a brake code. Do not use it as a holding-brake replacement without confirming the original actuator configuration |
| Unit will not physically fit during replacement | Different special specification, pilot orientation, cable exit, shaft dimensions, or mounting depth | ✅ High | Compare drawing dimensions, mounting holes, pilot diameter, cable exit, hollow-shaft dimensions, and connector locations against the removed unit | Match the full model and special-specification documentation, not just “FHA-32C” |
Field warning: Take photos of every connector, cable exit direction, flange orientation, motor label, encoder label, and machine parameter screen before pulling the actuator. A 50:1 size-32 unit can look correct and still be wrong because of feedback interface, winding, brake status, cable routing, or the SP special configuration.
❗ Do not perform insulation or hipot testing through the encoder circuit. Isolate motor phases from feedback wiring, use the OEM-approved test voltage, and follow the drive and actuator documentation. A careless insulation test can damage the encoder electronics.
If you are stuck, provide technical support with clear photos of the complete actuator label, connector faces, cable labels, servo-drive model, drive fault history, motor parameter screen, and mechanical mounting dimensions.
Frequently Asked Questions (FAQ)
Is FHA-32C-50-H-C1024-SP a complete servo actuator or only a gearbox?
It is a complete integrated servo actuator, not only a gear reducer. The FHA-C design combines the brushless servo motor, Harmonic Drive reduction mechanism, output bearing, feedback sensor, and hollow output shaft in one assembly. The central hollow passage allows cables, tubing, or similar utilities to pass through the axis.
What does the 50 in FHA-32C-50-H–SP mean?
The 50 identifies a 50:1 reduction ratio. The motor turns approximately 50 revolutions for one output revolution, subject to the exact actuator design. This ratio increases available output torque while reducing output speed, which is why it is common in compact, high-precision rotary axes. Harmonic Drive lists 50:1 as a supported ratio for the FHA-C H size-32 family.
Can I replace this actuator with another FHA-32C-50 model?
Only after a full compatibility check. Match the size, ratio, winding, encoder type, brake arrangement, output flange, mounting geometry, cable exit, connector pinout, feedback interface, and special specification. The H, , and SP portions of the model matter. To be honest, this is a bit of a hassle, but skipping the check can create encoder faults, drive overcurrent faults, incorrect commutation, or a mechanical mismatch.
What does the H suffix mean?
For the current FHA-C H family designation, H identifies a 680 V DC motor winding. The actuator must therefore match the electrical capability and motor-data requirements of the existing servo amplifier. Do not connect it to a drive based only on a similar flange size or 50:1 ratio.
Does this model include a holding brake?
The supplied model string does not include the B brake code used in Harmonic Drive FHA-C H model nomenclature. Treat it as a no-brake configuration unless the actual nameplate, order record, connector pinout, and mechanical inspection prove otherwise. For a vertical axis, gravity-loaded axis, or any load requiring safe holding after power loss, confirm the original brake requirement before purchasing.
Can I hot-swap this servo actuator?
No. Isolate machine power, discharge the servo-drive DC bus according to the drive manufacturer’s procedure, lock out the machine, and secure any gravity-loaded or suspended axis before disconnecting it. Disconnecting motor or encoder wiring under power can damage drive output stages or feedback electronics and may create an uncontrolled-motion hazard.
Will the machine retain its servo settings after I change the actuator?
Usually, servo tuning and motion parameters reside in the drive, controller, or project backup, not inside the actuator. However, the replacement may require verification or adjustment of motor parameters, encoder resolution, commutation data, current limits, direction, following-error limits, electronic gearing, and homing. Back up the drive and controller configuration before removal. Then record the original actuator label and every existing parameter screen.
Why is a new-surplus actuator less expensive than current factory stock?
New-surplus stock is original inventory held outside the current manufacturing channel. It may be unused but stored for years, and it may not have factory packaging or current factory support. Price depends on demand, storage condition, test documentation, special-specification status, warranty, and scarcity. Ask for actual photographs, a complete nameplate image, motor/encoder connector photos, inspection records, and a written warranty before issuing a purchase order.
