Nissei VF-nC3M Instruction Manual
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Contents
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ＮＩＳＳＥＩ ＣＯＲＰＯＲＡＴＩＯＮ E6581815F-3166.11.5 Avoiding overvoltage tripping : Overvoltage limit operation (Slowdown stop mode selection) : Overvoltage stall protection level FunctionThese parameters are used to keep the output frequency constant or increase it to preventovervoltage tripping in case the voltage in the DC section rises during deceleration or varying speedoperation. The deceleration time during overvoltage limit operation may increase above thedesignated time.Overvoltage limit operation levelDC VoltageOutputFrequency : Over-voltage stall protection level[Parameter setting]Title Function Adjustment range Default settingOvervoltage limit operation(Slowdown stop modeselection)0: Enabled1: Disabled2: Enabled (Quick deceleration control)3: Enabled (Dynamic quick decelerationcontrol)2 Overvoltage stall protectionlevel 100-150% 136, If is set to 2 (quick deceleration control), the inverter will increase the voltage to the motor (over-excitation control) to increase the amount of energy consumed by the motor when the voltage reaches theovervoltage protection level, and therefore the motor can be decelerated more quickly than normaldeceleration., If is set to 3 (dynamic quick deceleration control), the inverter will increase the voltage to themotor (over-excitation control) to increase the amount of energy consumed by the motor as soon as themotor begins to slow down, and therefore the motor can be decelerated still more quickly than quickdeceleration., During overvoltage limit operation, the overvoltage pre-alarm ( blinks) is displayed., Parameter f626 serves also as a parameter for setting the regenerative braking level. |
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