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Phone: +86 16626708626Description
- Key Technical Specifications
| Parameter | Specification |
| Model Code Breakdown | SJDE: Junma Drive | 04: 400 W Power | A: 200 V AC Input | N: Pulse Train Command | A: Standard Revision |
| Rated Output Power | 400 W (0.4 kW) |
| Main Circuit Input Power | Single-Phase 200 V AC to 230 V AC (+10% / -15%), 50/60 Hz |
| Control Power | Derived internally from main circuit input |
| Rated Output Current | 2.8 A RMS |
| Command Interface | Pulse Train Input (CW/CCW, Pulse/Direction, or 2-phase Quadrature) |
| Control Method | All-in-one digital PWM control (Auto-tuning / Parameter-less design) |
| Compatible Servo Motor | Yaskawa Junma SJME-04AM41 / SJME-04A141 (400W AC Servo Motors) |
| Feedback Mechanism | 1000 P/R incremental encoder feedback signal processing |
| Cooling Method | Natural Convection Cooling |
| Protection Functions | Overcurrent, Overvoltage, Undervoltage, Overload, Encoder Error |
- Product Introduction
The Yaskawa SJDE-04ANA is a 400 W compact AC servo amplifier from Yaskawa’s plug-and-play Junma Series. Designed specifically to replace traditional stepper motor drives and basic AC drives, the Junma architecture eliminates complex gain tuning by incorporating a self-adjusting control algorithm that automatically adapts to varying load inertias without requiring manual parameter adjustment.
Operating on a standard single-phase 200 V AC supply, the SJDE-04ANA takes step-and-direction or CW/CCW pulse train inputs directly from motion controllers or PLCs. Automation engineers specify the SJDE-04ANA for high-throughput packaging machinery, semiconductor handling systems, electronic component insertion equipment, and small CNC axis positioning where simple setup, small footprint, and low total system cost are essential.
SJDE-04ANA
SJDE-04ANA
- Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
| LED Display shows “A.b0” (Overcurrent) | Motor power lead shorted, or servo amplifier internal IGBT damaged | ✅ High | Disconnect motor UVW cables from drive; power cycle drive and run self-test | If alarm clears with motor cable disconnected, check motor windings and cables. If alarm persists without motor connected, replace the servo drive. |
| LED Display shows “A.30” (Regenerative / Overvoltage) | Rapid deceleration causing voltage bus spike; no external braking resistor connection | ✅ High | Check bus voltage across + and – terminals during high-speed deceleration moves | Lower the acceleration/deceleration ramp rates in the PLC, or reduce load inertia. Note: Junma drives do not support external regen resistors. |
| Motor moves in wrong direction | Pulse/Direction polarity inverted in software or phase U-V-W miswired | ❌ Low | Check parameter switches / DIR signal polarity from host PLC controller | Swap software DIR signal polarity or modify pulse command mode parameters on controller. Never swap U-V-W motor phases to change direction. |
| Motor fails to respond to pulse train | Enable signal (RUN) inactive or pulse input line driver mismatch | ✅ High | Measure logic voltage across RUN/STOP control inputs and pulse input pins | Ensure +24 V DC command enable signal is active. Verify pulse line driver signal levels meet differential/open-collector input thresholds. |
- Frequently Asked Questions (FAQ)
Q: Does the Yaskawa Junma SJDE-04ANA require parameter tuning using software?
A: No. The primary innovation of the Junma series is its parameter-less, auto-tuning design. The drive automatically calculates load inertia and optimizes gain levels in real time, eliminating the need for manual gain adjustments or tuning software like SigmaWin+.
Q: Can I pair the SJDE-04ANA with a standard Sigma-II or Sigma-5 servo motor?
A: No. Junma drives are strictly matched to Junma series servo motors (specifically the SJME-04 series 400W motors). They use specialized encoder feedback interfaces that are not compatible with standard Sigma-II (SGMGH/SGMPH) or Sigma-5 (SGMGV) motor encoders.
Q: What is the maximum pulse input frequency supported by the drive?
A: The pulse train input interface supports maximum pulse frequencies up to 500 kpps when driven via a differential line driver, or up to 200 kpps when using open-collector wiring.
Q: Can an external regenerative braking resistor be added to the SJDE-04ANA?
A: No. Junma SJDE series drives rely solely on internal capacitors for braking energy absorption and do not have terminal connections for external regenerative resistors. If your application involves high-inertia vertical loads or high-duty cycle stopping, lower the deceleration rate to avoid overvoltage alarms.
Q: How do you verify performance on surplus or refurbished Yaskawa SJDE servo drives before dispatch?
A: Every unit passes a strict 5-step SOP quality inspection. We clean internal heatsinks, inspect power bridge components, connect the unit to a matching SJME-04 400W test motor and PLC pulse generator, run full-speed bidirectional positioning cycles under dynamic load, and perform a 500V insulation breakdown test prior to ESD packaging.
