Basler MOC2 199 Motor Operated Control
The Basler MOC2 199 is a motor‑operated control device equipped with a 1 kΩ, 10 W precision potentiometer. It is designed for remote adjustment of voltage, speed, or other parameters in industrial control systems. The unit operates from a 125 VAC/DC supply and provides bidirectional motor drive for accurate positioning of the potentiometer wiper.
Construction and Components
The MOC2 199 consists of a reversible synchronous motor, a gear train, a 1 kΩ linear‑tape potentiometer, and a limit switch assembly. All components are housed in a sturdy metal enclosure with terminal blocks for external connections. The motor drives the potentiometer wiper through the gear train, providing precise and repeatable positioning.
Key Features
Motor drive: 125 VAC/DC, 50/60 Hz, reversible.
Potentiometer: 1 kΩ ±5 %, 10 W, linear taper.
Rotation angle: 300° mechanical, 280° electrical.
Two independent limit switches for end‑of‑travel protection.
Manual override knob for local adjustment.
Indicating pointer with scale plate (optional).
Compact design for panel mounting.
Electrical Specifications
Motor power consumption: 6 W running, 15 W starting. Potentiometer resistance tolerance: ±5 %, power rating 10 W. Operating temperature: -10 °C to +50 °C. Insulation resistance: > 50 MΩ at 500 VDC. Dielectric strength: 1500 VAC for 1 minute.
Operation Principle
When control voltage is applied to the motor leads, the motor rotates in either direction, moving the potentiometer wiper via the gear train. The wiper position is directly proportional to the motor run time. The limit switches cut off power at the end positions to prevent over‑travel. The potentiometer output can be used as a feedback signal or as a control input to a regulator.
Installation and Wiring
Mount the MOC2 199 on a panel using the four mounting holes. Connect the AC/DC supply to the motor terminals (M1/M2). The direction of rotation is determined by the polarity of the applied voltage for DC, or the phase connection for AC. Wire the potentiometer as a three‑terminal variable resistor (wiper, CW, CCW). Connect the limit switches (NC) in series with the motor circuit to interrupt power at travel ends.
Adjustment and Calibration
Before operation, manually rotate the knob to check the mechanical limits. Adjust the limit switch actuators to fine‑tune the travel range. The potentiometer output can be calibrated with an ohmmeter to ensure linearity. For remote control, a DPDT switch or relay is used to reverse polarity or phase.
Applications
Commonly used as a motorised rheostat for excitation control of generators, voltage regulators, and speed controllers. It is also employed in process control loops where remote setpoint adjustment is required. The MOC2 199 is ideal for applications needing frequent adjustments without manual intervention.
Maintenance
Lubricate the gear train periodically with a light machine oil. Check the carbon brushes (if present) for wear. Clean the potentiometer track with a contact cleaner if noise or erratic output occurs. Verify limit switch operation every six months.
Safety Considerations
Ensure the motor supply is fused appropriately. The motor is not thermally protected; do not stall the motor for more than a few seconds. The potentiometer should not be loaded below 10 % of its rated power to avoid excessive heating.
Conclusion
The Basler MOC2 199 Motor Operated Control provides reliable, remote positioning capability for industrial controls. Its robust motor, precision potentiometer, and built‑in limit protection make it a versatile component for automation systems.
