MAGNESCALE HA705 LK905 22189 Replacement for LK Series

Product Overview

MAGNESCALE HA705 LK905 22189 Replacement for LK Series: Smooth Transition & Legacy System Compatibility

The MAGNESCALE HA705 / LK905 / 22189 is a high-precision magnetic linear scale sensor engineered for demanding industrial environments including rolling mills, CNC machining centers, grinding machines, and heavy-duty press lines. As legacy MAGNESCALE LK Series installations age or reach end-of-life, sourcing a verified replacement becomes critical to maintaining production continuity. This unit is a direct-fit replacement and upgrade solution for existing LK Series magnetic linear scale systems, offering full dimensional compatibility, identical signal output specifications, and drop-in mechanical mounting — minimizing retrofit engineering time and eliminating the need for custom adapter brackets or signal converters in most standard installations.

Whether your facility is migrating from an older MAGNESCALE LK700 or LK800 series scale head, or replacing a failed HA705 reader head on an existing LK905 scale body, this replacement unit maintains the same 5 µm or 10 µm resolution output (TTL/RS-422 differential line driver) that your existing motion controller, CNC interpolator, or PLC position feedback card is already configured to receive. Engineers managing multi-axis systems will appreciate that the HA705 reader head retains the same cable pinout and connector type as earlier LK Series variants, meaning your existing MAGNESCALE signal cables, junction boxes, and interpolation units — such as the MAGNESCALE MJ series or SI series signal processors — can be reused without rewiring.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful LK Series migration rarely involves a single component. In practice, field engineers replacing the HA705 reader head or LK905 scale body will often simultaneously audit adjacent components to prevent secondary failures. The MAGNESCALE MJ-series interpolation unit is the most common companion component — it converts the raw magnetic scale signal into the quadrature pulse train consumed by your CNC controller or servo drive feedback input. If the MJ unit shows signs of signal degradation or connector corrosion, replacing it alongside the HA705 eliminates a common source of position drift and encoder fault alarms.

For systems where the existing MAGNESCALE signal cable runs exceed 10 meters, or where the cable jacket has been compromised by coolant or mechanical abrasion, a replacement MAGNESCALE LK Series signal cable with the correct 8-pin or 10-pin connector should be sourced at the same time. Attempting to reuse a damaged cable with a new reader head is a leading cause of intermittent position errors post-retrofit.

In rolling mill and heavy press applications, the LK905 scale body is often mounted alongside MAGNESCALE SR Series or SL Series rotary encoders on the main drive shaft or feed roll axis. If your modernization project extends to the rotary feedback loop, the MAGNESCALE SR75 or SR85 rotary encoder series offers the same signal interface and is compatible with the same Fanuc, Mitsubishi, or Siemens CNC interpolator cards already installed in your control cabinet.

Control cabinet integration is another key consideration. Many older rolling mill control systems use a dedicated MAGNESCALE display unit — such as the MAGNESCALE DK series digital readout — to provide local position indication independent of the CNC. These DK series readouts accept the same TTL/RS-422 signal from the HA705 and require no reconfiguration when the reader head is replaced. If your DK unit is also end-of-life, it can be replaced in parallel without disrupting the scale body installation.

For facilities upgrading from a fully analog legacy system to a digital feedback architecture, a MAGNESCALE SI-series signal interface module may be required to bridge the HA705 output to a modern EtherCAT or PROFINET-based motion controller. This is particularly relevant in greenfield modernization projects where the CNC backbone is being upgraded to a Siemens SINUMERIK 840D sl or Fanuc 30i/31i/32i platform while retaining the existing mechanical scale installation.

Finally, if your retrofit scope includes replacing the entire linear axis feedback system — scale body, reader head, signal processor, and display — sourcing all components from the same MAGNESCALE LK Series platform ensures signal chain consistency and simplifies commissioning. Mixed-brand or mixed-generation feedback chains are a frequent source of resolution mismatch, reference mark incompatibility, and homing cycle errors that extend machine downtime during startup.

Retrofit Guidance FAQ

Q: Can I replace only the HA705 reader head without replacing the LK905 scale body?
A: Yes. The HA705 reader head and LK905 scale body are mechanically and electrically independent. If the scale body is undamaged and the magnetic tape is intact, replacing only the reader head is the standard repair approach and restores full system accuracy.

Q: Will my existing CNC or PLC position feedback card need reconfiguration after installing the HA705?
A: In most cases, no. The HA705 outputs the same TTL/RS-422 differential quadrature signal as earlier LK Series reader heads. Your CNC interpolator or PLC high-speed counter module should recognize the signal without parameter changes. Verify your encoder resolution setting (pulses per mm) matches the HA705 specification before powering up.

Q: Is the HA705 compatible with Fanuc, Mitsubishi, and Siemens CNC systems?
A: Yes. The TTL/RS-422 output is a universal industrial standard accepted by Fanuc 0i/16i/18i/21i/30i, Mitsubishi M70/M80, Siemens SINUMERIK 808D/828D/840D, and most third-party motion controllers with a standard encoder feedback input.

Q: What is the physical installation clearance requirement?
A: The HA705 reader head maintains the same form factor as the LK Series standard. Mounting hole pattern, read gap, and cable exit direction are identical to previous LK Series variants, allowing direct installation without machining or bracket modification in standard applications.

Q: How do I verify the replacement is working correctly after installation?
A: Power up the system and monitor the position feedback in your CNC or PLC diagnostic screen. Move the axis manually and confirm the position count increments and decrements correctly. Perform a reference mark search (homing cycle) to verify the reference pulse is detected. Check for encoder fault alarms — absence of alarms and stable position readout confirm correct installation.

Q: Can this unit be used in coolant-rich or high-vibration environments?
A: Yes. The MAGNESCALE LK Series is specifically designed for machine tool environments with coolant mist, metal chips, and mechanical vibration. The HA705 reader head is sealed to the same IP protection class as the original LK Series specification.

Warranty Assurance

Every MAGNESCALE HA705 LK905 22189 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of shipment. Prior to dispatch, each unit undergoes functional verification including signal output check, connector integrity inspection, and mechanical clearance confirmation. Units are packed in anti-static, shock-absorbing packaging suitable for international air and sea freight.

In the event of a confirmed defect within the warranty period, TOPNLMS provides replacement support with priority processing. Our technical team is available to assist with installation questions, signal compatibility verification, and commissioning guidance via email and phone. We maintain stock of the HA705 LK905 22189 and related LK Series components to support urgent replacement orders with fast dispatch from Xiamen, China.

For B2B procurement teams managing planned maintenance schedules or emergency breakdown replacements, TOPNLMS offers consolidated invoicing, packing list documentation, and export compliance support for cross-border shipments. Lead time, stock availability, and volume pricing can be confirmed directly with our sales team before order placement.