Product Short Description
Product Name: FRENIC-DC FRS Series High-Power DC Drive, 800 A
Product Overview: The FRS800B is a high-power thyristor-based DC motor speed controller from Fuji Electric’s FRENIC-DC / FRS series, designed for high-torque loads in heavy industry. It provides dual closed-loop (speed/current) control for separately-excited or shunt-wound DC motors.
Description
Technical Specifications:
- Rated Output Current: 800 A continuous (150% overload for 1 minute)
- Input Voltage: 3-phase 380–460 V AC (±10%)
- Control Method: Dual closed-loop (speed and current); analog command or digital communication
- Trigger Pulses: Wide-pulse firing for large inductive loads
- Communication: RS-485 / Modbus (some firmware revisions support only Fuji proprietary protocol)
- Cooling: Forced air (≥20 m³/min air flow; filter to be cleaned periodically)
- Protection Rating: IP20 (must be installed inside a control cabinet)
- Dimensions: approx. 450 × 600 × 280 mm (excluding heatsink protrusions)
- Weight: approx. 45 kg
- Operating Temperature: 0–40 °C (derate 2% per °C above 45 °C)
- Altitude: <1000 m (reinforce insulation or derate at higher altitudes)
- Compatible Motor: Separately-excited / shunt-wound DC motor (not for permanent-magnet DC motors)
Key Features: 800 A continuous output with 150%/1-min overload capacity; wide-pulse firing to prevent commutation failure; dual-loop regulation for tight speed and torque control; Modbus communication for integration into modern control systems; rugged construction for heavy-duty industrial service.
Working Principle: Three-phase AC is fed to a thyristor bridge whose firing angle is modulated by the inner current loop and outer speed loop. The resulting adjustable DC voltage drives the motor armature; the wide firing pulse ensures reliable commutation even under high inductance.
Application Scenarios: Legacy paper machines; cold-rolling mills; high-torque crane and hoist drives; any application requiring high-power DC motor control.
Installation Requirements: House in a ventilated control cabinet (IP20 requires enclosure); provide forced-air cooling of ≥20 m³/min with regular filter cleaning; allow space around the unit per dimensions; use two-person lift for the ~45 kg weight; ensure proper heat-sink clearance.
Usage Notes: Not suitable for permanent-magnet DC motors; confirm firmware communication protocol (Modbus vs. Fuji proprietary) before integration; derate above 45 °C and at altitudes over 1000 m; back up parameter settings before any module replacement.
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