Reliance 0-57C401-2

Manufacturer: Reliance Electric (now part of Rockwell Automation / Emerson)

Product Overview:
The Reliance 0-57C401-2 is a G-series AC variable frequency drive designed for general-purpose motor speed control. It provides precise speed and torque regulation for 3-phase AC induction motors.

Model Series: G-Series (Bulletin 57C)

Category:
Description

Technical Specifications:

  • Input Voltage: 480 V AC, 3-phase, 60 Hz
  • Output Voltage: 0–480 V AC (adjustable)
  • Power Rating: 5 HP (3.7 kW)
  • Output Current: 9.0 A (rated)
  • Control Method: V/Hz (Scalar)
  • Frequency Range: 0–400 Hz
  • Acceleration/Deceleration: Ramp up/down adjustable 0.1–3600 sec
  • Communication: RS-485 (Modbus RTU)
  • Enclosure Rating: NEMA 1 / IP20 (open frame)
  • Operating Temperature: -10 °C to +50 °C
  • Dimensions: Approx. 254 mm × 152 mm × 102 mm

Functional Features:

  • V/Hz control for constant torque applications
  • Built-in PID controller for process control
  • Multiple speed presets (up to 16 speeds)
  • Braking resistor connection available
  • Digital I/O for start/stop and fault signals
  • Analog input (0–10 V or 4–20 mA) for speed reference
  • Fault history logging

Structural Features:

  • Open-frame design (no enclosure)
  • Terminal block connections for power and I/O
  • LED status indicators (Run, Fault, Alarm)
  • Keypad interface (removable)

Applicable Industries:

  • Pumps and fans
  • Conveyors
  • Compressors
  • HVAC systems
  • General motor control

Installation Requirements:

  • Mount vertically on a flat surface
  • Provide adequate ventilation (minimum 100 mm clearance on all sides)
  • Use copper wire sized per NEC Table 430.250
  • Ground the drive chassis to equipment ground

Usage Notes:

  • Do not operate without proper grounding
  • Install input and output fuses per manual
  • Derate output current at altitudes above 1000 m
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