Emotron MSF 2.0 Softstarter

Torque boost current limit [316]In this menu torque boost is enabled and the current limitfor torque boost is configured.3 1 63Torque boost current limitDefault: oFFRange: oFF, 300-700% of I noFFTorque boost disabled300-700 Torque boost current limit.Torque boost active time [317]This menu is available if torque boost is enabled in menu[316]. In this menu the time for the torque boost to beactive is selected.3 1 7o00F FTorque boost active timeDefault: 1.0 sRange: 0.1-2.0 s0.1-2.0 Torque boost active time.SettingSettingStop method [320]In this menu the stop method is chosen. The menus necessaryfor configuring the stop will be available depending onthe chosen stop method.3 2 04Stop methodDefault: 4Range: 1, 2, 3, 4, 51 Linear torque control2 Square torque control3 Voltage control4 Coast5 BrakeSettingTorque controlWith torque control at stop, the torque to the motor will becontrolled from the nominal torque down to the chosen endtorque at stop (menu [321]). Examples for the torque rampsfor linear and square torque control are shown in Fig. 43.The default value for end torque at stop is 0; this value maybe increased if the motor is standing still before the stop isfinished to avoid unnecessary heat development in themotor. With the end torque at stop set properly, the motorspeed will decrease linearly down to standstill.NOTE: Check whether the motor can accelerate the loadwith “Torque boost” without any harmful mechanicalstress.Torque1 Linear2 SquareNOTE: Check that the nominal motor current isconfigured properly in menu [221].Nominal torque8.7.3 StopWith MSF 2.0, four stop methods are available: torque control,voltage control, coast and braking. Torque control isavailable for loads with linear or square torque characteristic.A torque or voltage-controlled stop is used for applicationswhere the motor stopping suddenly could harm the application,e.g. water hammer in pump applications. In general atorque-controlled stop is recommended for these applications.The voltage-controlled stop can be used if a linearvoltage ramp is desired. When coast is selected as a stopmethod, the voltage to the motor will be switched off andthe motor will be left freewheeling. Braking may be used inapplications where the motor needs to be stopped quickly,e.g for planers and bandsaws.End torqueFig. 43 Torque control at stopStop timeTimeAny start method except for direct on-line (DOL) can becombined with any stop method, e.g. torque control can beused at start and brake for stop. The DOL start method canonly be combined with coast or brake stop methods.60 Functional description Emotron AB 01-4135-01r2