Elevating machine control apparatus
AssigneeFujitec Co., Ltd.
InventorTakao Okada
Life of this patent
Estimating the term…
Abstract
An elevating machine control apparatus controls an inverter (4) to drive an AC motor (5) connected to the inverter (4) with AC power, and energizes a power generation braking resistor (13) to apply a brake during regenerative operation of the AC motor (5). The apparatus prohibits the elevating machine from starting operating and interrupts power supply to the power generation braking resistor (13) if the DC stage voltage of the inverter (4) has a ripple quantity of a set value or more when the elevating machine is being stopped. Alternatively, the apparatus commands the elevating machine to stop operating and interrupts power supply to the power generation braking resistor (13) if the DC stage voltage of the inverter (4) during regenerative operation is a reference value or less when the elevating machine is in operation.
Claims8
An elevating machine control apparatus comprising an inverter controlled according to a torque command provided from a difference signal between a predetermined speed command signal and a speed signal corresponding to an actual traveling speed, an AC motor connected to the inverter and driven by an AC power of variable voltage and variable frequency, and a power generation braking resistor energized to apply a brake by on/off control of a regenerating semiconductor device during regenerative operation of the AC motor, wherein the elevating machine control apparatus determines that the regenerating semiconductor device is in failure when it is detected that the DC stage voltage of the inverter has a ripple quantity of a set value or more while the elevating machine is being stopped, and prohibits the elevating machine from starting operating and interrupts power supply to the power generation braking resistor.
An elevating machine control apparatus comprising an inverter controlled according to a torque command provided from a difference signal between a predetermined speed command signal and a speed signal corresponding to an actual traveling speed, an AC motor connected to the inverter and driven by an AC power of variable voltage and variable frequency, and a power generation braking resistor energized to apply a brake by on/off control of a regenerating semiconductor device during regenerative operation of the AC motor, wherein the elevating machine control apparatus determines that the regenerating semiconductor device is in failure when it is detected that the DC stage voltage of the inverter during regenerative operation is a reference value or less while the elevating machine is in operation, and commands the elevating machine to stop operating and interrupts power supply to the power generation braking resistor.
An elevating machine control apparatus comprising an inverter controlled according to a torque command provided from a difference signal between a predetermined speed command signal and a speed signal corresponding to an actual traveling speed, an AC motor connected to the inverter and driven by an AC power of variable voltage and variable frequency, and a power generation braking resistor energized to apply a brake by on/off control of a regenerating semiconductor device during regenerative operation of the AC motor, wherein the elevating machine control apparatus determines that the regenerating semiconductor device is in failure when it is detected that the DC stage voltage of the inverter has a ripple quantity of a set value or more while the elevating machine is being stopped, and prohibits the elevating machine from starting operating and interrupts power supply to the power generation braking resistor, and determines that the regenerating semiconductor device is in failure when it is detected that the DC stage voltage of the inverter during regenerative operation is a reference value or less while the elevating machine is in operation, and commands the elevating machine to stop operating and interrupts power supply to the power generation braking resistor.
Dependencies are inferred from the claim text.