Edwards / Seiko Seiki SCU-301 Turbo Molecular Pump Controller

The Edwards / Seiko Seiki SCU-301 is a 5-axis active magnetic bearing (AMB) control unit engineered to drive and monitor middle-capacity STP-301 and STP-451 series turbomolecular vacuum pumps. Operating as a half-rack, solid-state frequency converter, the SCU-301 regulates magnetic levitation current to provide friction-free, oil-free rotor suspension with minimal operational vibration.

Designed with automatic vibration reduction (AVR), self-diagnostic logic, and emergency battery-free power levitation, the SCU-301 ensures complete rotor stabilization across acceleration, steady-state high-vacuum operation, and automatic dynamic braking cycles.

Technical Specifications

Compatible Turbo Pump Series

The SCU-301 serves as a dedicated drive unit for 300 L/s and 450 L/s maglev turbomolecular pumps:

• STP-301 Series: STP-301 (Standard), STP-301C (Corrosive-Spec)

• STP-451 Series: STP-451 (Standard), STP-451C (Corrosive-Spec)

Key Features & Lab Benefits

• Active Magnetic Suspension: Keeps the turbopump rotor levitated across 5 axes without mechanical contact, eliminating oil backstreaming risks and mechanical bearing wear.

• Auto Tuning & Self-Diagnostics: Integrated control circuitry continuously monitors rotor position and automatically diagnoses sensor or motor faults to trigger safe system shutdowns.

• Battery-Free Emergency Protection: Utilizes back-EMF energy generated by the spinning rotor to maintain magnetic levitation during unexpected mains power loss, safely decelerating the rotor.

• Compact Half-Rack Footprint: Standard 3U half-rack width allows easy integration into instrument cabinets or process tool chassis.