Fuji Electric SC-05 Contactor Instruction Manual

1. Introduction

This manual provides essential information for the safe and effective installation, operation, and maintenance of the Fuji Electric SC-05 Contactor. Please read this manual thoroughly before attempting any installation or operation to ensure proper use and to prevent potential hazards.

2. Safety Information

WARNING: Electrical shock hazard. Only qualified personnel should install, operate, or service this equipment.

• Always disconnect all power sources before working on the contactor or connected equipment.
• Ensure proper grounding and wiring in accordance with local and national electrical codes.
• Do not operate the contactor if it is damaged or if any parts are missing.
• Wear appropriate personal protective equipment (PPE) when working with electrical systems.

3. Product Overview

The Fuji Electric SC-05 is a compact and reliable magnetic contactor designed for controlling electric motors and other resistive loads. It features a robust design suitable for industrial applications, offering efficient switching capabilities and auxiliary contacts for control circuit integration.

Key Features:

• Coil Voltage: 200-220VAC 50Hz / 220-240VAC 60Hz
• Auxiliary Contacts: 1 Normally Open (N/O) + 1 Normally Closed (N/C)
• Rated Power: Up to 5.5KW AC3 at 380/440V
• Certifications: UL Listed, CE, VDE

This image displays the Fuji Electric SC-05 Contactor, showing its main power terminals (L1, L2, L3) and auxiliary contacts (13 NO, 23 NO). The coil terminals A1 and A2 are visible at the top. Various electrical ratings and certifications are printed on the side labels, including voltage, current, and power ratings for AC-3 and AC-1 applications, as well as UL, CE, and VDE markings.

4. Setup and Installation

4.1 Mounting

Mount the contactor vertically on a DIN rail or using screws through the designated mounting holes. Ensure sufficient clearance around the contactor for ventilation and wiring access.

4.2 Wiring Connections

Refer to the wiring diagram provided with the product and the labels on the contactor for correct connections. Use appropriate wire gauges for the rated current.

• Power Terminals (L1, L2, L3): Connect the incoming three-phase power supply to these terminals.
• Load Terminals (T1, T2, T3 - typically opposite L1, L2, L3): Connect the motor or load to these terminals.
• Coil Terminals (A1, A2): Connect the control voltage (200-220VAC 50Hz / 220-240VAC 60Hz) to energize the contactor coil.
• Auxiliary Contacts (13 NO, 23 NO, etc.): These contacts are used in the control circuit for interlocking, signaling, or other control functions. The SC-05 typically includes 1 Normally Open (NO) and 1 Normally Closed (NC) auxiliary contact.

Torque all terminal screws to the specified values to ensure secure electrical connections.

5. Operating Principles

The SC-05 contactor operates by energizing its electromagnetic coil. When the control voltage is applied to terminals A1 and A2, the coil generates a magnetic field, which pulls the armature, causing the main power contacts to close and the auxiliary contacts to change state. When the control voltage is removed, the magnetic field collapses, and springs return the contacts to their original positions, opening the main power circuit.

6. Maintenance

Regular maintenance helps ensure the longevity and reliable operation of the contactor.

• Inspection: Periodically inspect the contactor for signs of wear, damage, or overheating (discoloration). Check for loose connections.
• Cleaning: Keep the contactor free from dust, dirt, and foreign objects. Use a dry, lint-free cloth for cleaning. Do not use solvents.
• Contact Check: If possible and safe, inspect the main contacts for pitting or excessive wear. Replace the contactor if contacts are severely degraded.
• Terminal Tightness: Re-tighten terminal screws periodically, especially in environments with vibration.

7. Troubleshooting

If the contactor is not functioning as expected, consider the following common issues:

• Contactor does not energize:
  • Check control voltage at A1 and A2.
  • Verify control circuit wiring and fuses.
  • Ensure the coil is not damaged (e.g., open circuit).
• Contactor energizes but load does not receive power:
  • Check main power supply to L1, L2, L3.
  • Inspect main contacts for severe wear or welding.
  • Verify load wiring.
• Contactor hums excessively or overheats:
  • Check for incorrect coil voltage.
  • Ensure proper mounting and ventilation.
  • Inspect for mechanical obstruction or foreign material.

For complex issues, consult a qualified electrician or contact Fuji Electric technical support.

8. Specifications

9. Warranty and Support

For warranty information, technical support, or service inquiries, please contact Fuji Electric directly or refer to their official website. Keep your purchase receipt for warranty claims.