17MDEP 3HP.3PH.DOL MOTOR STARTER Distribution Board

A 3-phase DOL (Direct On Line) starter is typically used for applications involving small to medium-sized three-phase motors, like small pumps, fans, conveyor belts, where a high starting current isn't a major concern due to its simple design and low cost, making it suitable for applications requiring basic motor start and stop functionality with overload protection • Small motors: Primarily used for low-power three-phase motors where the high inrush current during startup isn't a significant issue. • Simple applications: Ideal for applications requiring basic motor start and stop functionality without complex speed control needs. • Cost-effective: Considered a cost-efficient option due to its simple design. Examples of 3ph DOL starter applications: • Small water pumps: Starting small pumps in residential or commercial settings • Conveyor belts: Starting conveyor motors in light-duty applications • Small machinery: Operating small industrial machinery with basic motor control needs • Motor size: Ensure the motor horsepower falls within the rated capacity of the DOL starter. • Power supply quality: Check for sufficient voltage stability to handle the high starting current. • Starting Press the start button to energize the contactor coil and close the contacts. This allows the motor to receive the 3-phase supply. • Safety Ensure the installation meets the requirements of the IEE wiring regulations, the Machinery Directive, and current health and safety legislation. • Maintenance Switch off the starter and disconnect the main supply before doing any maintenance. Keep the interior dust free. • Relay setting Set the relay to the rated current mentioned on the motor name plate. • Terminals Check the terminals periodically to ensure they are correctly tightened. • Components Ensure the correct components are selected, and the cable sizing, protective devices, and Earth bonding are correct. • Overload protection: Prevents damage to the motor by interrupting power when the current exceeds the motor's rating. • Phase failure protection: Prevents the motor from running on two phases if one phase fails. • Phase interchange protection: Prevents the motor from rotating in reverse if a phase changes. • Voltage protection: Prevents damage to the motor by protecting against voltage differences between the three phases. • Dry run protection: Prevents damage to the motor by detecting when the motor is running without water. Other features. • Single phasing protection: Prevents single phasing, phase unbalance, and phase reversal failures.