SANYO DENKI R720-012E18 E681000C30 Replacement for R Series

Product Overview

SANYO DENKI R720-012E18 E681000C30 Replacement for R Series: Smooth Transition & Legacy System Compatibility

When your SANYO DENKI R720-012E18 E681000C30 AC Servo Motor reaches end-of-life or fails unexpectedly on the production floor, every hour of unplanned downtime translates directly into lost output and escalating maintenance costs. This replacement unit is sourced, tested, and stocked specifically to support engineers and procurement teams executing a controlled migration from aging R Series servo systems — whether you are replacing a single failed axis or modernizing an entire multi-axis servo drive cabinet.

The R720-012E18 E681000C30 is a 200 W class AC servo motor from SANYO DENKI’s R Series platform, designed for high-response positioning applications in CNC machining centers, semiconductor handling equipment, packaging lines, and precision assembly systems. Its 18-bit absolute encoder (E681000C30 encoder suffix) delivers high-resolution feedback compatible with SANYO DENKI’s SANMOTION R ADVANCED MODEL servo amplifiers, including the RS2A series and legacy RS1 series drives. When migrating from an older R Series installation, the encoder interface, resolver wiring pinout, and motor power connector layout remain consistent across the R720 frame size, significantly reducing rewiring effort during field replacement.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful R Series servo migration rarely involves replacing the motor in isolation. In most retrofit projects, the R720-012E18 E681000C30 is installed alongside a SANMOTION R RS2A servo amplifier — the current-generation drive that accepts the 18-bit absolute encoder signal natively and supports both MECHATROLINK-II and pulse/direction command interfaces. If your existing cabinet uses an older RS1 series amplifier, the amplifier itself may also require replacement to maintain encoder compatibility with the E681000C30 encoder specification.

For multi-axis systems, the servo amplifier rack typically shares a common DC bus or a shared power supply module. When replacing one axis in a multi-axis SANMOTION R installation, it is advisable to inspect the regenerative resistor unit and the shared power supply capacity to confirm they remain within rated load after the motor swap. In installations where the control architecture uses a SANYO DENKI SANMOTION C or SANMOTION F motion controller, the axis parameter file stored in the controller must be updated to reflect the new encoder resolution (18-bit vs. legacy 17-bit) before the first powered test run.

Wiring between the servo amplifier and the R720-012E18 E681000C30 follows the standard R Series motor cable harness. If the existing motor cable is worn or the connector is damaged, a replacement motor power cable and encoder cable set compatible with the R720 frame should be ordered at the same time to avoid a second service visit. Terminal block modules mounted in the control cabinet — such as those used for brake control wiring (the R720-012E18 includes a built-in holding brake) — should be verified for 24 VDC brake release compatibility before commissioning.

In applications where the servo system interfaces with a third-party PLC — such as a Mitsubishi MELSEC Q Series or iQ-R Series controller, or a Siemens S7-300/S7-1500 — the pulse output module or motion control module on the PLC side does not require modification, as the command interface is handled entirely by the servo amplifier. Signal isolation modules between the PLC I/O and the amplifier enable input terminals are recommended in high-noise environments typical of large servo drive cabinets. For installations using MECHATROLINK-II network topology, the network terminator resistor and station address DIP switch settings on the RS2A amplifier must be reconfigured after physical motor replacement to restore correct network communication.

Where the retrofit involves replacing multiple axes simultaneously, a structured commissioning sequence — powering each axis individually, verifying encoder origin return (homing), and running a low-speed jog before enabling full-speed operation — minimizes the risk of mechanical collision during the first powered cycle. TOPNLMS can supply the R720-012E18 E681000C30 in single-unit or multi-unit quantities to support phased or full-line retrofit schedules.

Retrofit Guidance FAQ

Q: Can I reuse the existing motor cable from the old R720 variant?
A: In most cases, yes. The R720 frame motor power connector (U/V/W/PE) and encoder connector pinout are consistent across R Series production runs. Inspect the cable for insulation damage and connector wear before reuse. If the encoder cable is a 15-pin D-sub type from an older incremental encoder motor, a new encoder cable compatible with the E681000C30 absolute encoder is required.

Q: Do I need to modify the servo amplifier parameters after replacement?
A: Yes. If upgrading from a 17-bit to an 18-bit absolute encoder, the encoder resolution parameter in the RS2A amplifier must be updated. The motor ID and inertia ratio parameters should also be re-entered from the R720-012E18 datasheet. Failure to update these parameters will result in incorrect torque limiting and position loop gain behavior.

Q: Is the 60 mm flange bolt pattern identical to older R720 variants?
A: Yes. The R720 frame flange dimensions and bolt circle are standardized across the R Series. The motor can be bolted directly to the existing machine mounting bracket without machining or adapter plates.

Q: What communication protocols does this motor support?
A: The R720-012E18 E681000C30 motor itself is protocol-agnostic — communication protocol (MECHATROLINK-II, pulse/direction, analog ±10 V) is determined by the paired servo amplifier. The RS2A amplifier supports MECHATROLINK-II and pulse/direction natively. Confirm your amplifier model before ordering if protocol compatibility is a concern.

Q: How do I handle the holding brake wiring during replacement?
A: The R720-012E18 includes a 24 VDC holding brake. The brake release circuit must be wired to a 24 VDC power supply with sufficient current capacity (typically 0.2–0.5 A). Verify the existing brake relay or brake control output on the amplifier is rated for the brake coil current before reconnecting.

Q: Can this unit replace motors from other brands in the same power class?
A: Cross-brand replacement requires careful verification of flange dimensions, shaft diameter, encoder interface, and amplifier compatibility. TOPNLMS recommends using this unit as a direct SANYO DENKI R Series replacement. For cross-brand migration inquiries, contact our technical team at [email protected].

Warranty Assurance

Every R720-012E18 E681000C30 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to shipment, each unit undergoes a pre-delivery inspection that includes visual examination, encoder signal verification, and insulation resistance testing to confirm the unit meets original SANYO DENKI R Series specifications.

In the event of a confirmed defect within the warranty period, TOPNLMS will arrange a replacement unit or issue a credit at our discretion, subject to inspection of the returned item. Our after-sales response target is within 24 business hours of a warranty claim submission. Replacement units for in-warranty claims are prioritized from available stock to minimize your production downtime.

For procurement teams requiring documentation, we can provide a test report, packing list, and commercial invoice with each shipment. Export packaging is designed for international air and sea freight, with anti-static protection and foam cushioning appropriate for precision servo motor components.

Stock availability is updated regularly. For urgent requirements or multi-unit orders, contact us directly to confirm lead time and reserve allocation.