Measurement control system ROTAS-L

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Overview
Kawasaki developed the ROTAS tilting-angle control technology in 1967 and applied ROTAS-equipped electro-hydraulic servo pumps to high-accuracy position and speed control in forming presses. Since 1978 ROTAS has been incorporated into in-house L-series pumps for forging and other heavy applications. The electric control pump K3VG/K7VG combined with the ILIS electrohydraulic servo regulator delivers flow precisely according to a pilot voltage input. ILIS inherits ROTAS reliability and enhances controllability and responsiveness with a built-in microprocessor and advanced control techniques.

Features of the ROTAS

• Good linearity and low hysteresis for accurate flow control.
• Accepts various electrical signals to enable remote control and feedback loop integration.
• Internal feedback mechanism simplifies system architecture (external feedback not required as with conventional servo valves).

Features of the ILIS

• Built-in microprocessor PID control delivers precise and stable controllability.
• Double feedback (sensed tilting angle plus mechanical minor-feedback) ensures stable, highly responsive control.
• Utilizes a powerful proportional valve designed for high reliability under contamination.
• Horsepower is electrically limited by sensed pressure; multi-step linear approximation (up to 6 steps) enables accurate control from low to high power.
• Pressure sensing compensates pump volumetric efficiency so delivered flow remains proportional to the input signal regardless of delivery pressure.

Specifications
ROTAS-L
response — step response: 0.3s (0° → 27°) / frequency response: 3Hz (±12.5°,-3dB)
hysteresis: 1%
linearity: <2%

ILIS
response — step response: ≤0.3s (0 → 100%) / frequency response: ≥3Hz (-3dB)
hysteresis: ≤1% / FS
linearity: ≤±0.5% / FS

Applications

• Plastic machinery & die casting
• Press machines
• Metal plants

Technical characteristics

• ROTAS-L step response: 0.3s (0°→27°); frequency response: 3Hz (±12.5°,-3dB); hysteresis 1%; linearity <2%.
• ILIS step response: ≤0.3s (0→100%); frequency response: ≥3Hz; hysteresis ≤1% FS; linearity ≤±0.5% FS.
• ILIS includes built-in PID microprocessor control, double feedback (tilting angle + mechanical) and pressure-compensated flow proportional to the input signal.
• Horsepower control via electrical limitation with multi-step linear approximation (up to 6 steps).