II. Model Interpretation

0-846181: Basic model (Reliance E660 high-torque DC servo frame)

1R: Configuration version (500 PPR encoder, standard winding, no brake, keyway shaft)

III. Core Technical Parameters (Original Factory Specifications)

Motor type: Permanent magnet brushed DC servo (Brush DC Servo)

Rated Voltage: 90 VDC (operating range 24–180 VDC)

Rated Torque: 3.2 Nm (continuous)

Peak Torque: 9.6 Nm (3 times overload)

Rated Speed: 2500 RPM

Maximum Speed: 4000 RPM

Rated Current: 4.8 A

Peak Current: 14.4 A

Armature Resistance: 1.2 Ω (25℃)

Armature Inductance: 8.5 mH

Reverse Potential Constant: 0.32 V/(rad/s)

Rotor Inertia: 0.0028 kg·m²

Encoder: Built-in incremental type, 500 PPR, differential A/B/Z, 5VDC power supply

Shaft Diameter / Keyway: 5/8" (15.88 mm), standard flat key

Installation Flange: NEMA 34 (86 mm square)

Length / Weight: 235 mm / 7.5 kg

Insulation Class: F grade (155℃)

Protection Class: IP44 (shaft end IP54)

Environmental Temperature: 0–40℃ (continuous)

IV. Interface and Wiring Definitions

1) Power Wiring (4-wire)

A+: Armature positive

A-: Armature negative

FG: Ground (frame)

2) Encoder Wiring (6-wire, differential)

+5V: Encoder power supply

GND: Power ground

A+ / A-: A phase differential

B+ / B-: B phase differential

Z+ / Z-: Z phase (origin) differential

V. User Manual (Installation + Debugging + Maintenance)

1) Installation Requirements

Flange Fixation: NEMA 34 through-hole installation, 4 M5 bolts, torque 2.5 Nm

Alignment: Load and motor shaft alignment ≤ 0.08 mm, avoid radial load

Environment: No strong dust, no corrosive gas, away from strong electromagnetic interference (frequency converter, large contactor)

Cables: Power cable ≥ 14AWG (2.0 mm²), encoder cable use double-shielded twisted wire, length ≤ 10 m

2) Electrical Debugging (compatible with Baldor DC1 / Reliance DC‑35 series drives)

Wiring Check: Power cable and encoder cable separate wiring (spacing ≥ 20 cm), shield layer single-ended grounding

Parameter Setting (drive)

Motor Type: DC Servo (brushed)

Rated Voltage: 90 VDC

Rated Current: 4.8 A

Current Limit: 14.4 A

Encoder Resolution: 500 PPR

Test Run: First, no-load jog (500 RPM), check direction, abnormal noise, encoder feedback; then gradually load to rated torque

3) Maintenance and Care (Industrial Standard)

Brush Inspection: Every 2000 hours inspection, replace when worn to 5 mm (original factory part: Carbon Brush 0846181-BR)

Bearings Maintenance: Add high-temperature lubricating grease every 4000 hours (model: Mobil XHP 222)

Encoder Calibration: Check Z phase origin signal every 6 months to ensure positioning accuracy

Insulation Test: Once a year, armature-to-ground insulation ≥ 1 MΩ (500VDC multimeter)

4) Common Fault Troubleshooting

Motor does not rotate: Check power cable wiring, drive enable signal, encoder power supply Low-speed jitter: Reduce gain, check encoder shielding, adjust driver dead zone (DB) potentiometer

Overheating alarm: Overloaded load, poor heat dissipation, severely worn brushes

Poor positioning: Incorrect encoder wiring, loss of Z phase, loose coupling

Six. Application scenarios

Industrial automation: CNC cutting machines, packaging machinery, auxiliary axes of injection molding machines

Precise positioning: Heavy-duty displacement tables, machine tool feed, robot joints

Replacement and upgrade: Replace old models such as Electro-Craft E643-04-029, E660-04-076 of DC servo motors