MAGNESCALE HA705 LK905 22189 Retrofit-Ready Linear Scale for LK Series Control Systems
The MAGNESCALE HA705 LK905 22189 is a high-precision magnetic linear scale sensor engineered for seamless compatibility with legacy LK Series measurement and control systems. As original MAGNESCALE LK Series components approach end-of-life or become increasingly difficult to source, the HA705 LK905 22189 provides a verified retrofit path that preserves measurement accuracy, minimizes rewiring effort, and protects existing machine programs from costly re-engineering. Whether you are upgrading a rolling mill, a CNC grinding machine, a coordinate measuring system, or a precision press line, this unit delivers the dimensional feedback performance your process demands — without forcing a full platform replacement.
MAGNESCALE’s LK Series linear scales have been deployed across decades of precision manufacturing infrastructure. When an LK-series scale fails or becomes unavailable, the downstream impact is immediate: production halts, dimensional tolerances drift, and quality records become unreliable. The HA705 LK905 22189 addresses this directly by maintaining the signal interface, mounting geometry, and resolution characteristics that LK Series controllers — including the MAGNESCALE LH10, LH11, and LH70 display units — are already configured to receive. This means your existing wiring harness, terminal block layout, and controller parameter settings can remain largely intact during the swap.
Before committing to a retrofit, engineers should verify several critical compatibility parameters. First, confirm the power supply voltage at the scale connector: LK Series installations typically operate at 5 VDC or 12 VDC depending on the controller generation, and the HA705 LK905 22189 must be matched to the correct supply rail. Second, review the terminal wiring diagram against the existing cable assembly — particularly the SIN+, SIN−, COS+, COS−, and reference mark signal lines — to ensure pin assignments align without adapter boards. Third, check the mounting rail and end-block configuration: the LK905 read head bracket dimensions should be compared against the existing carriage slot to confirm a direct mechanical fit or identify whether a transition bracket is required.
Signal resolution and interpolation settings stored in the MAGNESCALE display or controller must also be reviewed. If the replacement system is connected to a MAGNESCALE LH70A or a third-party DRO that previously read a different resolution variant, the interpolation factor may need adjustment to maintain accurate positional readout. Similarly, if the machine uses a FANUC or Mitsubishi CNC with a serial encoder interface, the scale’s analog output must be confirmed compatible with the servo amplifier’s feedback input specification before installation.
Upgrade Compatibility Table
| Parameter | Detail |
|---|---|
| Compatible Series | MAGNESCALE LK Series (LK10, LK11, LK21, LK31) |
| Read Head Model | LK905 (HA705 assembly, part ref. 22189) |
| Signal Output | Analog sinusoidal (1 Vpp), compatible with standard interpolation units |
| Supply Voltage | 5 VDC / 12 VDC (verify against existing controller supply rail) |
| Mounting Interface | LK Series standard rail; end-block and carriage bracket compatible |
| Communication Compatibility | Compatible with MAGNESCALE LH10, LH11, LH70A display units; analog DRO inputs |
| Replacement Recommendation | Direct retrofit for discontinued LK Series scales; verify resolution setting in controller |
| Commissioning Focus | Terminal polarity, interpolation factor, reference mark position, zero-point calibration |
| Origin | Japan |
| Warranty | 12-Month Warranty — covers manufacturing defects and signal integrity |
Retrofit Planning for Existing Automation Systems
A successful LK Series retrofit begins well before the replacement unit arrives on-site. Start by documenting the full measurement loop: identify the scale, the read head cable routing, the junction box or terminal strip, and the display or controller input card. In many installations, the MAGNESCALE LH70A or LH11 display unit is mounted on the control cabinet door, with the scale cable routed through cable drag chains to the machine carriage. Photograph the existing terminal connections before disconnecting anything.
If the machine also uses a MAGNESCALE SR75 or SR128 rotary encoder for spindle feedback, note that the linear and rotary feedback channels are typically handled by separate input cards in the controller. Replacing the linear scale does not affect the rotary encoder channel, but both should be verified for signal integrity during the commissioning phase. Similarly, if the control cabinet includes a MAGNESCALE DK10 or DK20 interpolation unit between the scale and the controller, confirm that the interpolation unit’s input sensitivity is matched to the HA705 LK905 22189 output amplitude.
For machines integrated into a broader CNC environment — for example, a grinding center using a FANUC 0i-MD or a Mitsubishi M70 controller — the linear scale signal may feed into a separate measurement axis card rather than the main servo feedback loop. In these cases, the axis parameter file must be reviewed to confirm that the scale pitch, resolution, and direction settings are consistent with the replacement unit. If the machine also uses a MAGNESCALE LM10 or LM15 linear motor scale for a direct-drive axis, that axis should be treated as a separate system and is not affected by the LK Series replacement.
Wiring adapters are occasionally required when the replacement cable connector does not match the existing harness termination. In such cases, a short adapter pigtail using shielded twisted-pair cable — with the shield grounded at one end only — is the recommended approach. Avoid extending the scale cable beyond the manufacturer’s specified maximum length, as signal attenuation at the interpolation input can introduce positional errors that are difficult to diagnose during acceptance testing.
Before final installation, bench-test the HA705 LK905 22189 against a known-good MAGNESCALE display unit to confirm signal output amplitude and reference mark function. This pre-shipment verification step, combined with our outgoing inspection process, ensures that every unit leaves our facility in confirmed working condition. All units are supplied with a 12-month warranty covering manufacturing defects and signal performance.
Downtime Control During System Migration
Minimizing production downtime during a linear scale replacement requires a structured changeover plan. Begin by scheduling the swap during a planned maintenance window rather than responding reactively to a failure. If the existing LK Series scale is still partially functional, use the remaining operational time to complete all preparatory steps: obtain the replacement HA705 LK905 22189, prepare the wiring documentation, and stage all tools and adapter hardware at the machine.
During the physical swap, work systematically from the display unit back to the scale. Disconnect the display first, then the cable at the junction box, then the read head from the carriage. Install the replacement read head, reconnect the cable in reverse order, and power up the display before reconnecting to the controller. This sequence allows you to verify scale signal output independently before reintroducing the measurement data to the CNC or DRO system.
After reconnection, perform a full-stroke reference mark search to re-establish the machine’s absolute position reference. If the machine uses incremental positioning only, jog the axis to a known mechanical reference point and reset the display zero. Verify dimensional accuracy against a calibrated reference artifact before releasing the machine to production. Document the as-found and as-left measurements for your maintenance records. With proper preparation, a skilled technician can complete the full swap and verification in under four hours, keeping unplanned downtime to a minimum.
Retrofit Support FAQ
Q: Is the MAGNESCALE HA705 LK905 22189 a direct drop-in replacement for all LK Series scales?
A: The HA705 LK905 22189 is compatible with the LK10, LK11, LK21, and LK31 series scales in most standard configurations. Verify the mounting rail length, read head bracket dimensions, and cable connector type before ordering. Contact our technical team with your existing scale’s nameplate data for a confirmed compatibility assessment.
Q: Do I need to reconfigure my controller after replacing the scale?
A: In most cases, if the replacement unit matches the original scale’s resolution and signal type, no controller parameter changes are required. However, if the interpolation factor or axis resolution setting was customized for the original unit, those parameters should be reviewed and adjusted as needed during commissioning.
Q: What wiring checks should I perform before powering up the replacement scale?
A: Verify supply voltage polarity, confirm SIN/COS signal line assignments against the wiring diagram, check cable shield grounding, and ensure the connector is fully seated. Use a multimeter to confirm supply voltage at the scale connector before connecting the read head.
Q: What does the 12-month warranty cover?
A: The 12-month warranty covers manufacturing defects, signal output integrity, and mechanical assembly quality. Units that fail under normal operating conditions within the warranty period will be repaired or replaced at no charge. Warranty does not cover damage resulting from incorrect installation, overvoltage, or physical impact.
© 2026 SMARTNEXMSK. All rights reserved.
Original Source: https://smartnexmsk.com
Contact: sales@smartnexmsk.com | +86 18259474341
