Toshiba TOSVERT VFS15-2004PM-W1 Instruction Manual

Also see for TOSVERT VF-S15 series: Function manual Quick start manual Instruction manual Instruction manual Instruction manual

E6581611A-221Low loads and low inertia loadsThe motor may demonstrate instability such as abnormal vibrations or overcurrent trips at light loads of5% or under of the load percentage, or when the load's inertia moment is extremely small. If thathappens reduce the carrier frequency.Occurrence of instabilityUnstable phenomena may occur with the load and motor combinations shown below. Combined with a motor that exceeds applicable motor ratings for the inverter Combine with a much smaller motor according to the applicable motor rating of the inverter. Combined with special motorsTo deal with the above lower the settings of inverter carrier frequency. Combined with couplings between load devices and motors with high backlashWhen using the inverter in the above combination, use the S-pattern acceleration/deceleration function,or when vector control is selected, adjust the load inertia moment ratio or switch to V/f control mode. Combined with loads that have sharp fluctuations in rotation such as piston movementsIn this case, adjust the load inertia moment ratio during vector control or switch to V/f control.Braking a motor when cutting off power supplyA motor with its power cut off goes into free-run, and does not stop immediately. To stop the motorquickly as soon as the power is cut off install an auxiliary brake. There are different kinds of brakedevices, both electrical and mechanical. Select the brake that is best for the system.Load that produces regenerative torqueWhen combined with a load that produces regenerative torque, the overvoltage or overcurrentprotection function may be activated to trip the inverter.