Optical absolute encoder
Lika Electronic EHCT59 optical absolute encoder
Optical hollow-shaft absolute multiturn encoder with up to 25-bit single-turn and 15-bit multiturn resolution (energy-harvesting turn counter), SSI or BiSS-C, 14 or 15 mm hollow shaft, IP65 and 6,000 rpm.
Key specifications
| Speed (max) | 6,000 rpm |
|---|---|
| Bore (max) | 15 mm |
| Ingress protection | IP65 |
| Data / bus | SSI, BiSS-C |
| Resolution (max) | 40 bit |
| Resolution | single-turn up to 25 bit, multiturn up to 15 bit |
| Housing | 58 |
Summarised in our own words from Lika Electronic s.r.l.'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2
Notes on this data
R.EHCT59 replaces discontinued HSCT/HMCT versions as spares.
Specify Motion is not affiliated with Lika Electronic s.r.l.. Lika Electronic and EHCT59 are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Engineer support
Speak to our engineers about your project
Our experienced engineers are on hand, ready to help with your project. Whether you need the Lika Electronic EHCT59 itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
- Help sourcing EHCT59 and spares for installed machines
- Modified and custom designs when a catalogue part doesn't fit
- Complete axis: motor, drive, gearing and feedback matched together
What an optical absolute encoder is
An optical absolute encoder reads a unique code pattern on a disc or scale, so every position has its own digital value and position is known immediately at power-up. Single-turn encoders give position within one revolution; multi-turn encoders also count revolutions using gears or electronic counters. Position is sent over a serial interface such as SSI or BiSS, a manufacturer-specific protocol, or a fieldbus. Optical scanning gives high resolution, typically 17 bits per revolution or more in servo encoders, and good accuracy.
When engineers choose an optical absolute encoder
Choose an optical absolute encoder where knowing position at power-up matters, such as robots, machine tools, multi-axis machines and axes that cannot be homed safely. It removes homing routines and supports safety functions. The trade-offs are cost, interface compatibility and contamination sensitivity. Battery-backed multi-turn types need battery maintenance; gear or energy-harvesting types avoid that. In very dirty environments, magnetic or inductive absolute encoders may suit better.
How to specify the Lika Electronic EHCT59
Send these with your enquiry and an engineer can confirm the right EHCT59 variant or an equivalent:
- Single-turn resolution (bits)
- Multi-turn range (revolutions)
- Interface: SSI, BiSS, proprietary serial or fieldbus
- Accuracy (arcsec)
- Shaft or hollow shaft size (mm)
- Speed (rpm)
- Environment and safety rating
Common mistakes to avoid
- Choosing an interface the drive does not support
- Forgetting battery maintenance on battery-backed multi-turn types
- Confusing resolution with accuracy
- Ignoring cable length limits for serial interfaces
Lika Electronic EHCT59: frequently asked questions
What is the Lika Electronic EHCT59?
Optical hollow-shaft absolute multiturn encoder with up to 25-bit single-turn and 15-bit multiturn resolution (energy-harvesting turn counter), SSI or BiSS-C, 14 or 15 mm hollow shaft, IP65 and 6,000 rpm. Published series figures include speed 6,000 rpm, bore 15 mm, resolution 40 bit. It is made by Lika Electronic s.r.l.; Specify Motion can help source it or propose an equivalent.
Who makes the Lika Electronic EHCT59?
The Lika Electronic EHCT59 is made by Lika Electronic (Lika Electronic s.r.l.) and is listed here for engineers comparing options. Specify Motion is not affiliated with Lika Electronic s.r.l.; brand names are used only to identify the product.
What is the speed of the Lika Electronic EHCT59?
The published series maximum speed is 6,000 rpm. Individual models and sizes in the EHCT59 range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Lika Electronic EHCT59?
Yes. Our engineers can propose an equivalent built around your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
What is the difference between single-turn and multi-turn absolute encoders?
A single-turn absolute encoder knows its angle within one revolution. A multi-turn absolute encoder also counts complete revolutions, so it knows total position over many turns even after power loss. Multi-turn encoders avoid homing on axes driven through screws or gears.
Which interface should an absolute encoder use?
Use the interface supported by the drive or controller. SSI is simple and widely supported, BiSS-C is an open bidirectional protocol, and several manufacturer-specific protocols are common on machine tools and servo drives. Fieldbus encoders suit PLC networks. Check cable lengths and update rates for the control loop.
Further reading: Absolute vs incremental encoders · How to select an encoder · Encoders and feedback
Other optical absolute encoder series
Spec builder
Specify what you need instead of EHCT59
Select every part you need, answer the questions an applications engineer would ask, and see your summary before we ask for any details.
- 1Products
- 2Performance
- 3Environment
- 4Volumes
- 5Your spec
Engineer support
Our engineers are ready to help with your project
Tell us about your project and how you use the Lika Electronic EHCT59: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
- Reviewed by an engineer, not an autoresponder
- Like-for-like and better-fit alternatives
- Standard, modified and custom options
Prefer to configure it? Use the spec builder.