Copley Controls ARM98AC-N25 Retrofit-Compatible Servo Drive

Copley Controls ARM98AC-N25 Retrofit-Compatible Servo Drive for Legacy Systems

The Copley Controls ARM98AC-N25 — cross-referenced as 1080-01385 and 800-1843, with the European part designation 907.00.67 — is a high-performance analog servo drive from the ARM98AC series, purpose-built for brush and brushless AC servo motor control in demanding industrial automation environments. As original production of this model has been discontinued, maintenance engineers and procurement teams managing legacy motion control systems increasingly rely on service-ready stock to sustain uptime without committing to a full platform migration. NINERMAS maintains verified inventory of the ARM98AC-N25, pre-shipment tested and backed by a 12-month warranty, to support exactly these retrofit and continuity scenarios.

Whether you are managing a CNC machining center, a semiconductor handling system, a precision assembly line, or a packaging machine that was originally commissioned with Copley Controls servo technology, the ARM98AC-N25 provides a direct-fit replacement path that preserves your existing motor wiring, encoder feedback loop, and analog command interface — eliminating the need for costly re-engineering of the motion axis.

Upgrade Compatibility Table

Retrofit Planning for Existing Automation Systems

A successful ARM98AC-N25 retrofit begins well before the drive is physically installed. Maintenance engineers should start by auditing the full servo axis assembly: confirm that the AC servo motor paired with this drive — whether a Kollmorgen, Parker, or Copley-matched motor — is still within its rated service life and that the encoder cable and feedback connector pinout match the ARM98AC-N25’s input specification. In many legacy installations, the encoder cable shield grounding and the analog command cable routing are sources of noise that can destabilize the velocity loop after a drive swap; these should be inspected and corrected during the replacement window.

On the power side, verify that the DC bus capacitor bank or the AC line filter upstream of the drive is still serviceable. Aging bus capacitors in the power cabinet can cause overvoltage faults on the replacement drive even when the original unit masked the problem through degraded performance. If the system uses a shared DC bus architecture, check that the regenerative braking resistor and the bus voltage clamp are rated for the ARM98AC-N25’s peak current output.

For the control interface, the ARM98AC-N25 typically receives its velocity or torque command from a CNC controller, a motion controller such as a Galil DMC series card, or a PLC analog output module. Confirm that the ±10V command signal level, the enable relay logic, and the fault output wiring are correctly mapped before powering up. In systems where the original drive communicated drive status back to a Siemens S7 or Allen-Bradley ControlLogix PLC via discrete I/O, verify that the fault and ready signals are correctly wired to the replacement unit’s terminal block.

If the machine uses an HMI panel — such as a Proface GP series or a Siemens TP700 — that displays axis status or drive fault codes, confirm that the fault code mapping in the HMI project still aligns with the ARM98AC-N25’s fault output behavior. In some legacy installations, the HMI reads drive status through a serial link or a fieldbus gateway; ensure the gateway configuration is preserved during the swap. Additionally, inspect the 24VDC control power supply feeding the drive’s logic board, as well as any signal isolators or optocoupler modules in the enable and fault circuit — these components age independently and can introduce intermittent faults that are incorrectly attributed to the replacement drive.

Terminal blocks, DIN rail sections, and cable duct within the control cabinet should be inspected during the retrofit window. Loose terminations on the motor power leads or the encoder connector are a common root cause of nuisance faults after a drive replacement. If the cabinet also houses a Copley Controls Xenus or Accelnet module on an adjacent axis, use this opportunity to verify those drives’ firmware versions and tuning files are backed up — a single-axis retrofit is an efficient time to audit the full motion system.

Downtime Control During System Migration

Minimizing production downtime during an ARM98AC-N25 replacement requires a structured pre-swap preparation protocol. Before the maintenance window opens, retrieve the original drive’s tuning parameters — proportional gain, integral gain, derivative gain, current limits, velocity feedforward, and fault thresholds — from the commissioning documentation or from the drive’s non-volatile memory using Copley’s CME 2 software if the original unit is still partially functional. Store these parameters in a backup file and have them ready for upload to the replacement drive before the first test run.

During the swap, label all connectors before disconnection and photograph the wiring layout. The ARM98AC-N25’s motor power connector, encoder feedback connector, analog command input, and I/O terminal block should be reconnected in sequence and verified against the original wiring diagram. After reconnection, perform a static check — confirm bus voltage, logic power, and enable signal — before enabling the drive. Run the axis at reduced speed and current limits for the first test cycle to confirm stable velocity loop behavior before restoring full production parameters.

For systems where the ARM98AC-N25 is part of a multi-axis gantry or coordinated motion system, coordinate the test sequence with the machine’s motion controller to avoid axis collision during the commissioning phase. If the machine uses a safety relay or a safety PLC for axis enable, verify that the safety circuit is correctly re-engaged after the drive swap and that the safety function test is documented per your site’s maintenance protocol.

NINERMAS ships the ARM98AC-N25 with pre-shipment functional testing completed, reducing the risk of receiving a non-functional unit during a planned maintenance window. Standard lead time is confirmed at order; expedited shipping is available for emergency breakdown scenarios. Long-term supply agreements are available for customers managing fleets of machines with ARM98AC-series drives.

Retrofit Support FAQ

Q: Is the ARM98AC-N25 a direct drop-in replacement for the original Copley Controls unit with the same part number?
A: Yes, the ARM98AC-N25 supplied by NINERMAS is an original Copley Controls unit cross-referenced as 1080-01385, 800-1843, and 907.00.67. It is a direct hardware replacement. You will need to re-upload your original tuning parameters using CME 2 software and verify the enable and fault wiring before returning the axis to production.

Q: What compatibility checks should I perform before installing the replacement drive?
A: Confirm the motor type (brush or brushless AC), encoder feedback connector pinout, analog command signal level (±10V), AC input voltage, and the enable/fault I/O logic levels. Also verify that the mounting footprint and connector positions match your existing cabinet layout. If your system uses a resolver instead of an incremental encoder, confirm the ARM98AC-N25 variant supports resolver feedback.

Q: Does NINERMAS test the ARM98AC-N25 before shipment?
A: Yes. All units undergo pre-shipment functional testing to verify power stage integrity, control board operation, and I/O functionality. Each unit ships with a 12-month warranty from the shipment date. Test reports are available upon request for quality-critical applications.

Q: Can NINERMAS support long-term supply of ARM98AC-N25 units for a fleet of machines?
A: Yes. NINERMAS maintains service-ready inventory and can support reserved stock agreements for customers managing multiple machines with ARM98AC-series drives. Contact our team to discuss lead times, minimum order quantities, and long-term supply terms.