YASKAWA SRDA Series Servo Drive & Reducer Modules: HW9381442-DEPX2900L SRDA-SDB95A01A-EDX100MPL800 HW0380024-FEPX2900U

Technical Dossier

Product Details And Specifications

YASKAWA SRDA Series: Comprehensive Module Range and Technical Overview

The YASKAWA SRDA (Servo Drive) series, together with the DEPX and FEPX reducer assemblies, constitutes the core motion-control and power-transmission backbone of the YASKAWA Motoman industrial robot platform. Deployed across petrochemical refineries, nuclear facility material-handling cells, automotive body-in-white welding lines, and heavy-fabrication plants globally, these components are engineered to IEC 61800 servo drive standards and are rated for continuous-duty operation in Class F insulation environments. The SRDA servo amplifier family provides closed-loop torque, velocity, and position control for each robot axis, while the DEPX and FEPX harmonic-drive reducer units deliver the high reduction ratios (typically 1:80 to 1:160) required for precise, backlash-free joint articulation in 6-axis and 7-axis Motoman manipulators. The installed base of SRDA-series hardware spans multiple robot generations—UP, ES, HP, MA, MS, and MH series—making lifecycle parts management a critical operational requirement for maintenance engineers worldwide.

The Evolution of SRDA / DEPX / FEPX Architecture

YASKAWA's robot servo drive architecture has progressed through three distinct generations since the mid-1990s. The first generation, represented by the SRDA-COA□□A and early CACR-SR amplifier families, used analog current-loop control and discrete IGBT modules, requiring periodic capacitor and IGBT replacement at 5–7 year intervals. The second generation introduced the SRDA-SDB and SRDA-SDA families with digital DSP-based current control, integrated regenerative braking circuits, and the NX100 / DX100 controller bus interface. The third and current generation, represented by the SRDA-SDB95A01A and related variants, integrates FPGA-based real-time current regulation, EtherCAT-compatible encoder feedback, and enhanced thermal management for high-cycle-rate applications. The DEPX and FEPX reducer series (e.g., HW9381442-DEPX2900L, HW0380024-FEPX2900U) are mechanically matched to specific axis torque ratings and are not interchangeable across generations without verifying the output flange interface, reduction ratio, and oil-seal specification. Compatibility mapping between controller generation (NX100, DX100, YRC1000) and the corresponding SRDA amplifier variant is mandatory before substitution.

SRDA / DEPX / FEPX Full Catalog & Functionalities (SKU List)

Servo Drive Amplifier Modules (SRDA Series)

• SRDA-SDB95A01A-EDX100MPL800: DSP servo amplifier, DX100 bus interface, 95A peak output, axis U/L/R/B/T compatible
• SRDA-SDB01A: Standard servo amplifier module, NX100 controller, single-axis, 1.0 kW rated
• SRDA-SDB03A: Servo amplifier, NX100 / DX100, 3.0 kW, S/L/U axis duty
• SRDA-SDB06A: Servo amplifier, 6.0 kW, high-inertia axis application, DX100
• SRDA-SDB15A: 15 kW servo amplifier, heavy-payload robot axes, DX100 / YRC1000
• SRDA-SDA01A: Earlier-generation DSP amplifier, NX100 only, 1.0 kW, single axis
• SRDA-SDA03A: NX100 servo amplifier, 3.0 kW, S/L axis, predecessor to SDB03A
• SRDA-COA01A: Analog-control servo amplifier, UP/ES series robots, 1.0 kW, legacy
• SRDA-COA03A: Analog servo amplifier, 3.0 kW, UP/HP series, capacitor-refresh required
• SRDA-SDB95A02A: Dual-axis servo amplifier variant, DX100, 95A, wrist-axis grouping
• SRDA-SDB95A03A: Triple-axis servo amplifier, DX100 / YRC1000 transition, 95A

Reducer / Gearbox Assemblies (DEPX / FEPX Series)

• HW9381442-DEPX2900L: U-axis harmonic reducer, 2900 Nm rated torque, left-hand configuration, Motoman MA/MS series
• HW0380024-FEPX2900U: U-axis front-end reducer, 2900 Nm, upper-arm assembly, Motoman HP/MA series
• HW9381442-DEPX1500L: S/L-axis reducer, 1500 Nm, left-hand, standard 6-axis Motoman
• HW9381442-DEPX4500L: Heavy-payload L-axis reducer, 4500 Nm, Motoman MH series
• HW0380024-FEPX1500U: Front-end reducer, 1500 Nm, wrist/upper-arm, HP/ES series
• HW0380024-FEPX4500U: Heavy-duty front-end reducer, 4500 Nm, MH/MA large-frame robots

Sourcing Hard-to-Find & Obsolete SRDA / DEPX / FEPX Parts

The SRDA-COA and SRDA-SDA sub-families have been formally discontinued by YASKAWA, with OEM support terminated for NX100-generation hardware in most regions. DriveKNMS maintains a dedicated inventory of tested surplus and refurbished SRDA amplifiers and DEPX/FEPX reducer assemblies to support plants operating legacy Motoman robots beyond the OEM service window. Our sourcing network covers manufacturer-surplus stock, decommissioned robot cells, and certified repair-exchange units. For each obsolete part number, DriveKNMS provides a cross-reference to the nearest compatible current-generation substitute, including any required parameter file or wiring harness modification. Lead times for hard-to-find SRDA variants are typically 3–10 business days from confirmed order.

Quality Control for the SRDA / DEPX / FEPX Range

All SRDA servo amplifiers processed by DriveKNMS undergo a structured bench-test protocol: incoming inspection verifies bus connector integrity and capacitor ESR values; functional testing applies rated load current across the full speed range using a motor simulator; thermal imaging confirms IGBT junction temperatures remain within specification at 100% duty cycle; and final verification checks encoder feedback signal integrity at 2,500 PPR and 20,000 PPR resolutions. DEPX and FEPX reducer assemblies are inspected for oil-seal condition, output flange runout (tolerance: ≤0.02 mm TIR), and backlash measurement against OEM specification. Units exhibiting backlash exceeding 1 arc-minute are rejected or routed to rebuild. All tested units ship with a functional test report and a 12-month warranty against defects in materials and workmanship.