Nidec Digistart D3 User Manual

Nidec Digistart D3 User Manual Manual pdf 48 page image

48 Digistart D3: User GuideIssue: G7 Operation7.1 Start, Stop and Reset CommandsThe soft starter can be controlled in three ways:• using the buttons on the keypad• via remote inputs• via a serial communication linkThe LCL/RMT button controls whether the Digistart D3 will respond to local control (via the keypad) or remote control(via the remote inputs).• The Local LED on the keypad is on when the soft starter is in local control mode and off when the softstarter is in remote control mode.• The Remote LED on the Digistart D3 is on when the soft starter is in Remote mode and off when in Localmode. The Remote LED is located on the main body of the starter (behind the keypad) and is only visible ifthe keypad is remotely mounted.Control via the fieldbus communication network is always enabled in local control mode, and can be enabled ordisabled in remote control mode (Pr 3O Comms in Remote). Control via the serial communication network requiresan optional communication module.The STOP button on the keypad is always enabled.To reset a trip on the soft starter, press the RESET button on the keypad or activate the Reset remote input.NOTEAdaptive Control, Jog, Brake and PowerThrough functions are not supported with inside delta (six-wire)operation. See Inside Delta Operation on page 55.7.2 Soft start methodsSoft starters offer a variety of methods to control motor starting. Each soft start method uses a different primarycontrol parameter.Soft Start Method ParameterControlledPerformance Parameters InfluencedTimed Voltage Ramp Voltage Start current, start torque, accelerationConstant Current Current Start torque, accelerationTorque Control Torque Start current, accelerationAdaptive Control Acceleration Start current, start torqueBest results are obtained by selecting the soft start method that directly controls the parameter of most importance forthe application. Typically soft starters are used to limit motor start current or control load acceleration and/ordeceleration.The Digistart D3 offers Constant Current or Adaptive Control. Use Pr 2A to select the soft start method.To Control UseMotor Start Current Constant CurrentMotor/Load Acceleration Adaptive ControlTo soft start the motor, press the START button on the keypad or activate the Start remote input. The motor will startusing the start mode selected in Pr 2A.