Overview
The Incom Boston Gear Ratiotrol 67486 RevB is an SCR-based DC motor speed control designed for non-regenerative, adjustable-speed armature control of shunt-wound and permanent-magnet DC motors. This static converter accepts single-phase AC line power and outputs regulated DC voltage, making it a reliable choice for retrofitting existing equipment or integrating into new OEM designs. The unit is commonly found in manufacturing, automotive, material handling, and general industrial applications where variable motor speed is required without complex external controls.
Key Features
- Static SCR-based power conversion from AC to regulated DC output
- Adjustable speed control via potentiometer with broad horsepower range settings
- Non-regenerative control suitable for constant-torque and variable-load applications
- Compact enclosed design for industrial panel mount or standalone installation
- Proven Boston Gear reliability with field-proven service manuals and spare parts availability
- Optional features: thermal overload protection, forward/reverse, dynamic braking, and tachometer feedback
Technical Specifications
Verify the following specifications against your equipment nameplate before installation:
- Control Type: SCR-based static DC speed controller
- Input Power: Single-phase AC (voltage and frequency per nameplate)
- Output: Regulated DC for motor armature
- Motor Type: Shunt-wound and permanent-magnet DC motors
- Operational Mode: Non-regenerative, adjustable speed
- Control Interface: Speed potentiometer, on/off switch, optional feedback and input options
- Optional Features: Forward/reverse selection, jog control, thermal overload, tachometer follower, dynamic braking, acceleration/deceleration ramping
- Enclosure: NEMA 1 standard (dimensions per service manual)
- Revision: RevB (60208 specification document number)
Typical Applications
The Incom Boston Gear Ratiotrol 67486 RevB excels in:
- Manufacturing and material handling equipment requiring variable-speed motor operation
- Automotive and machine tool applications with constant-torque load profiles
- Retrofit upgrades to existing constant-speed DC motor systems
- OEM equipment integration where compact, static speed control is required
- Process equipment and conveyors demanding adjustable speed without regenerative braking
- Industrial automation systems where motor speed synchronization and load control are critical
Compatibility & Replacements
Compatible With
- Shunt-wound DC motors (most common industrial type)
- Permanent-magnet DC motors
- Single-phase AC power supplies (115V, 230V per controller rating)
- NEMA 1 enclosure mounting systems
- Standard industrial thermal overload relays and contactors
- Tachometer feedback systems (with appropriate option board)
Replaces / Drop-In Replacement For
The Incom Boston Gear Ratiotrol 67486 RevB may replace earlier Ratiotrol model variants with identical voltage, frequency, and horsepower ratings. Verify part number compatibility with your equipment manual or system integrator—substitution of parts may void UL listing. Common related models include Ratiotrol P-3016 and P-3026 variants, though direct equivalence must be confirmed by comparing control board option codes and motor specifications.
Works With
- Standard industrial AC/DC power distribution and wiring practices
- Thermal overload protection devices and time-delay fuses
- Field-mounted potentiometers and operator controls for speed adjustment
- Optional tachometer feedback for closed-loop speed regulation
- Forward/reverse selector switch options (if equipped)
- Dynamic braking option boards and acceleration/deceleration modules
- Boston Gear service manuals (Doc. No. 60881, 84980 and related) for wiring, troubleshooting, and field repair
