FUJI RYC202C3-VVT2 AC Servo Amplifier – FALDIC-W Series

FUJI RYC202C3-VVT2 — 200 W FALDIC-W AC Servo Amplifier in Closed-Loop Motion Control Architecture

The RYC202C3-VVT2 is a 200 W AC servo amplifier from FUJI Electric’s FALDIC-W platform, designed for deterministic closed-loop position, velocity, and torque control in industrial motion systems. Its three-phase 200–230 VAC input stage, 17-bit absolute encoder interface, and sinusoidal PWM current regulation place it in the class of compact drives capable of sub-millisecond torque response — a requirement in high-cycle packaging lines, multi-axis CNC machining centers, and precision semiconductor handling equipment.

Unlike general-purpose inverters, the RYC202C3-VVT2 operates within a fully closed servo loop: the 17-bit absolute encoder feeds back 131,072 counts per revolution to the drive’s DSP, which executes position, velocity, and current control loops at independent sampling rates. The result is a position-holding stiffness and dynamic bandwidth that general VFDs cannot replicate. The built-in regenerative resistor absorbs deceleration energy internally for most 200 W load profiles, eliminating the need for an external braking chopper in standard duty cycles.

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Technical Parameters

Hardware Logical Analysis

The RYC202C3-VVT2 implements a three-tier control hierarchy on a single DSP core. The outermost position loop samples encoder feedback and computes a velocity reference at a 1 ms cycle. The velocity loop runs at 250 µs, generating a torque (current) reference. The innermost current loop executes at 125 µs, directly commanding the IGBT gate drivers via sinusoidal PWM at 8 kHz. This cascade structure ensures that mechanical disturbances — load inertia changes, friction transitions, backlash — are rejected at the velocity loop before they propagate to position error.

The 17-bit absolute encoder serial interface uses a differential signal pair (equivalent to RS-422 electrical levels) with a proprietary FUJI framing protocol. Because the encoder retains absolute position through a battery-backed multi-turn counter, the drive can reconstruct axis position on power-up without executing a homing sequence. This is architecturally significant in applications such as gantry loaders or rotary indexers where a homing stroke would consume cycle time or risk mechanical collision.

EMC design on the FALDIC-W platform addresses both conducted and radiated emissions. The DC bus capacitor bank is physically located close to the IGBT module to minimize parasitic inductance in the switching loop, reducing high-frequency voltage spikes (dV/dt) that would otherwise couple into the encoder cable shield. The input rectifier stage includes a common-mode choke on the AC lines, attenuating common-mode noise injected back into the supply network. For installations requiring CE EMC compliance, an external line filter (FUJI recommended type) reduces conducted emissions to within EN 61800-3 Category C2 limits.

The built-in dynamic brake circuit connects a resistor across the motor terminals when the drive is disabled or faults. This provides controlled deceleration independent of the DC bus state — a safety-relevant function in vertical axis applications where gravity load would otherwise accelerate the motor after drive shutdown. The internal regenerative resistor handles continuous braking power up to the rated duty cycle; for applications with frequent, high-inertia deceleration cycles, the external resistor terminal allows connection of a larger thermal mass.

Auto-tuning in the FALDIC-W series uses a frequency-response identification method: the drive injects a swept sinusoidal torque disturbance and measures the resulting velocity response to estimate load inertia ratio and mechanical resonance frequency. The gain scheduler then sets proportional and integral gains for the velocity loop and, if resonance is detected below 500 Hz, activates a notch filter at the identified frequency. This process reduces commissioning time on varied mechanical loads — ball-screw axes, belt drives, and direct-drive rotary tables — without requiring manual gain entry.

System Integration Benefits

• Deterministic pulse command latency: The 500 kpps line-driver input accepts pulse trains from any high-speed PLC output module (Siemens, Mitsubishi, Omron, Keyence) with a propagation delay under 2 µs, preserving position synchronization in multi-axis gantry configurations.
• Absolute position retention: The 17-bit multi-turn absolute encoder eliminates homing cycles after controlled or uncontrolled power loss, reducing machine restart time from minutes to seconds in production environments.
• Transparent fault diagnostics: The drive stores the last eight fault codes with timestamps in non-volatile memory, accessible via the front-panel keypad or RS-485 port, enabling root-cause analysis without oscilloscope instrumentation.
• SX-bus network integration: Native RS-485 SX-bus compatibility allows the drive to be addressed as a network node under FUJI MICREX-SX or MICREX-F PLCs, enabling parameter read/write and status monitoring over a single twisted-pair cable.
• Inertia ratio tolerance: The adaptive gain tuning algorithm maintains stable velocity loop response across load inertia ratios from 1:1 to 30:1, accommodating mechanical design changes without drive re-parameterization.
• Compact panel footprint: At 55 mm width, the RYC202C3-VVT2 allows six-axis servo cabinets to be built within standard 600 mm enclosure widths, reducing panel fabrication cost and floor space.
• Built-in regeneration: Internal regenerative resistor handles deceleration energy for duty cycles up to the rated thermal limit, eliminating external braking hardware in the majority of 200 W applications and simplifying UL/CE panel wiring.
• Analog torque/velocity reference: The ±10 VDC analog input with 12-bit resolution provides 4,096 discrete command levels, supporting smooth speed ramps from analog-output PLCs or motion controllers without pulse-train hardware.

Quality Assurance & Global Logistics

Every RYC202C3-VVT2 unit dispatched from our Xiamen, China facility is a genuine FUJI Electric original component sourced through verified industrial supply channels. Prior to shipment, each unit undergoes a structured inspection protocol: label and date-code verification against FUJI Electric OEM specifications, visual inspection of connector pins, PCB, and housing for transit damage, and a power-on functional check where test equipment permits. Units are packed in anti-static foam inserts within double-wall corrugated cartons, with silica gel desiccant and a humidity indicator card to protect sensitive electronics during ocean or air freight.

Xiamen’s geographic position — direct access to Xiamen Gaoqi International Airport and Xiamen Port — enables same-day handover to DHL Express, FedEx International Priority, and UPS Worldwide Expedited. Transit times to Western Europe average 3–5 business days by air; to North America, 4–6 business days. Sea freight consolidation is available for bulk orders. All shipments include a commercial invoice, packing list, and certificate of origin. Export classification and HS code documentation are prepared in compliance with Chinese customs regulations and destination-country import requirements.

A 12-month warranty covers manufacturing defects under normal operating conditions as defined in the FUJI Electric FALDIC-W instruction manual. Warranty claims are processed with photographic evidence and fault code logs; confirmed defective units are replaced or credited within agreed lead times. B2B customers with recurring procurement requirements may request traceable lot documentation and incoming inspection reports.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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