Chapter 5 Main Circuit Terminals MS300 (High Speed Model) 5-2 DANGER Fasten the main circuit terminal screws to prevent sparking by loose screws due to vibration. When needed, only use an inductive filter at the motor output terminals U/T1, V/T2, W/T3 of the AC motor drive. DO NOT use phase-compensation capacitors or L-C (Inductance-Capacitance) or R-C (Resistance-Capacitance), unless approved by Delta. DO NOT connect brake resistor directly to +1/DC+ to DC-, +2/B1 to DC- to prevent damage to the drive. Ensure proper insulation of main circuit wiring in accordance with the relevant safety regulations.
Main power terminals R/L1, S/L2 and T/L3 have no phase-sequence requirement; they can be connected in any sequence. It is recommended adding a magnetic contactor (MC) at the power input to cut off power quickly and reduce malfunctioning when the protection function of the AC motor drive is activated. Both ends of the MC should have an R-C surge absorber. Please ensure voltages and currents are within specification. When using a general GFCI (Ground Fault Circuit Interrupter), select a sensitivity ≥ 200 mA and ≥ 0.1 s operation time to avoid nuisance tripping. Please use conduits or shielded cables for the power wiring and ground both ends of the conduit or shielded cables.
DO NOT run/stop the drive by turning the power ON/OFF. Run/stop the drive by RUN/STOP command. If you still need to run/stop the drive by turning power ON/OFF, it is strongly recommended to do so only ONCE per hour. To comply with UL standards, connect the drive to a 3WYE type of mains power system. Output terminals for main circuit Use a well-insulated motor, suitable for inverter operation. When the AC drive output terminals U/T1, V/T2, and W/T3 are connected to the motor terminals U/T1, V/T2, and W/T3 respectively, the motor will rotate counterclockwise (as viewed on the shaft end of the motor) when a forward operation command is received.
To permanently reverse the direction of rotation, switch over any two motor leads. Foward Running