Moog G403-552A

Product Introduction: The Moog G403 family comprises single- or dual-channel servo amplifiers / electronics packages for driving Moog two-stage electrohydraulic servo valves (e.g., D633, D634, D661, D791 series). The G403-552A variant is a rack or DIN-mount analog amplifier providing command summing, ramp generation, deadband compensation, and current drive for valve torque motor coils. Exact I/O configuration should be verified against the shipped datasheet as G403 sub-models vary in enable logic and feedback provision.

Category: MOOG

Description

Key Features (typical for G403 series):
- Accepts ±10 V command reference and ±10 V (or 4–20 mA) LVDT/position feedback for closed-loop if so equipped
- Adjustable gain, bias (null offset), and ramp rate
- Enable / Inhibit input; watchdog fault monitoring
- Dither oscillator to reduce valve hysteresis
- Output stage: controlled current source for valve coil (typical ±40 mA to ±200 mA depending on jumper setting)
Performance Parameters (representative):
- Supply: 24 VDC nominal (range 18–32 VDC), internal regulation for ±15 V logic
- Command Input Impedance: ≥ 100 kΩ (voltage mode)
- Output Current: jumper-selectable, commonly 0–±100 mA peak (verify per valve coil R and Iₙ)
- Bandwidth: > 500 Hz small-signal
- Operating Temp: -20 °C to +60 °C (typical industrial rating)
- Mounting: DIN rail or panel; metal enclosure
Installation & Notes:
- Match output current range to servo valve torque motor nameplate (e.g., Moog 761 series often 15–40 mA; D661 ~ 40–80 mA)
- Perform null/bias adjustment with valve installed but hydraulic pressure off initially
- Use twisted-pair shielded cable for valve coil connections; shield drained to amplifier ground only

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