Product Description

Model Number Interpretation

• 29LA: Base series identifier for Reliance RPM III DC motors.

• 678262: Unique component and design revision code.

• T1: Enclosure/configuration suffix (TEFC, standard mounting, dual-speed winding).

Technical Specifications

• Rated Power: 10 HP (7.5 kW)

• Voltage: 240 VDC (armature), 240 VDC (field)

• Speed: 1150 RPM (low speed) / 3450 RPM (high speed)

• Frame: 29LA (square laminated frame)

• Enclosure: TEFC (Totally Enclosed Fan Cooled)

• Insulation: Class F (155°C)

• Duty Cycle: Continuous (S1)

• Torque: Constant torque at low speed; constant power at high speed

• Mounting: Foot-mounted (horizontal)

• Weight: Approx. 180 kg

• Ambient Temperature: -10°C to +40°C

Interface and Communication Configuration

• Electrical Connections: Armature (A1/A2), field (F1/F2), thermal overload (TH1/TH2) terminals; standard screw-type connections.

• Feedback: Compatible with external tachometer (analog) or encoder (digital) for closed-loop speed control.

• Communication: No onboard industrial communication port; relies on external DC drive (e.g., Reliance GV3000/SE) for control and networking via drive-level protocols.

Core Functions

• Dual-Speed Operation: Switchable low/high speed for versatile load matching.

• Precise Speed Regulation: Shunt-wound design maintains stable speed under varying loads.

• High Torque Density: Laminated frame and optimized commutation deliver reliable torque.

• Thermal Protection: Built-in thermostat prevents overheating during continuous operation.

• Durable Construction: TEFC enclosure protects against dust, moisture, and contaminants.

Application Scenarios

• Industrial Machinery: Conveyors, mixers, extruders, and machine tools requiring variable speed.

• Material Handling: Cranes, hoists, and elevators with high starting torque demands.

• Process Industries: Printing, packaging, textile, and paper machinery.

• Legacy Systems: Direct replacement for older Reliance DC motors in modernized automation lines.

Usage and Maintenance Instructions

• Installation: Mount horizontally on a rigid base; align shaft with driven equipment; allow 150 mm clearance around the motor for airflow.

• Wiring: Use 12–14 AWG stranded copper wire; tighten terminals to 2.2 N·m; verify insulation resistance before power-up.

• Operation: Start with no load; accelerate gradually; avoid frequent rapid speed changes.

• Maintenance:

  • Inspect brushes and commutator every 3 months; replace brushes when worn to 10 mm length.

  • Lubricate bearings annually with recommended grease.

  • Clean TEFC cooling fan and air passages every 6 months.

  • Check terminal tightness and insulation resistance quarterly.

• Safety: Disconnect all power and wait 5 minutes for capacitor discharge before maintenance; use insulated tools; avoid operation beyond rated voltage/temperature.