SGDH-04AE - Yaskawa SGDH-04AE 400 W Sigma-II servo drive

Evidence-backed servo drive role for SGDH-04AE, with explicit installation boundaries.

Documented function

Rebuilt from individual evidence

System position

Unknown: Evidence boundary

The Sigma-II data sheet identifies SGDH-04AE as a 400 W servo drive for single-phase 200 to 230 VAC input.

The data sheet specifies serial encoder feedback and a three-phase output stage for the SGDH servo drive family.

Yaskawa identifies SGDH-04AE as a Sigma-II amplifier product line item.

The drive sits between the upstream controller and the matched servo motor in the documented axis.

The drive converts controller references into controlled electrical output for the matched servo motor.

Unknown: The installed motor pairing, command mode, parameter values, and machine load are not established by the captured sources.

Exact reference: SGDH-04AE
Category: Drives / VFD
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Controls a matched Sigma-II servomotor from the SGDH command and feedback loop.
System position: Sits between the controller and matched servomotor in a single-phase 230 V servo axis.
Upstream / inputs: Receives controller commands and serial encoder feedback through the SGDH interfaces.
Downstream / outputs: Supplies controlled three-phase electrical output to the matched servomotor.
Limitations: Unknown: The installed motor pairing, command mode, parameter values, and machine load are not established by the captured sources.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The Sigma-II data sheet identifies SGDH-04AE as a 400 W servo drive for single-phase 200 to 230 VAC input.
Confidence: high
- files.omron.eu — retrieved 2026-09-12; high confidence
The data sheet specifies serial encoder feedback and a three-phase output stage for the SGDH servo drive family.
Confidence: high
- files.omron.eu — retrieved 2026-09-12; high confidence
Yaskawa identifies SGDH-04AE as a Sigma-II amplifier product line item.
Confidence: high
- www.yaskawa.com — retrieved 2026-09-12; high confidence

Inferences

The drive sits between the upstream controller and the matched servo motor in the documented axis.
Confidence: medium
Rationale: The documented product type, interfaces, and motor or controller relationships support this system position.
- files.omron.eu — retrieved 2026-09-12; high confidence
The drive converts controller references into controlled electrical output for the matched servo motor.
Confidence: medium
Rationale: The documented control interfaces and motor or feedback connections support this signal and power path.
- files.omron.eu — retrieved 2026-09-12; high confidence
- www.yaskawa.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: The installed motor pairing, command mode, parameter values, and machine load are not established by the captured sources.
Confidence: low
Missing evidence: The installed motor pairing, command mode, parameter values, and machine load are not established by the captured sources.

System position diagram

Diagram showing SGDH-04AE between a motion controller and a matched servo motor. — System position of SGDH-04AE from the captured evidence.

View Mermaid source

flowchart LR
  controller[Motion controller] --> unit[SGDH-04AE]
  unit --> motor[Matched servo motor]

View diagram labels

Nodes: Motion controller; SGDH-04AE; Matched servo motor
Edges: Upstream control reaches the product; The product provides the documented downstream function

Next action

Decision: The captured evidence supports the documented servo drive role for SGDH-04AE; verify the installed system before replacement.

Next action: Match the exact reference, compatible controller or amplifier, feedback arrangement, and site conditions against the cited documents before sourcing.

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