Abstract: A solar power generation system includes a string, an inverter a first shut-off device, and a second shut-off device. The string includes a plurality of solar cell module groups connected in series. The first shut-off device is connected to a first electric path connecting between the plurality of solar cell module groups. The second shut-off device is connected to a second electric path connecting between the plurality of solar cell module groups. The first shut-off device cuts off a connection between the plurality of solar cell module groups connected to the first electric path in response to a first control signal from the inverter. The second shut-off device is driven by an electrical power supplied from the first shut-off device and cuts off a connection between the solar cell module groups connected to the second electric path in response to a second control signal from the first shut-off device.

Abstract: A solar power generation system includes a string, an inverter a first shut-off device, and a second shut-off device. The string includes a plurality of solar cell module groups connected in series with each other. The first shut-off device cuts off a connection between the plurality of solar cell module groups connected to a first electric path connecting between the plurality of solar cell module groups in response to a first control signal from the inverter. The second shut-off device is connected to the first shut-off device in a two-way communicable manner by a communication system different from power line communication and cuts off a connection between the solar cell module groups connected to a second electric path connecting between the plurality of solar cell module groups in response to a second control signal output from the first shut-off device by a communication system different from power line communication.

Abstract: A solar power generation system includes a string, an inverter a first shut-off device, and a second shut-off device. The string includes a plurality of solar cell module groups connected in series with each other. Each of the solar cell module groups includes one or a plurality of solar cell modules connected in series. The first shut-off device cuts off a connection between the plurality of solar cell module groups connected to a first electric path in response to a first control signal from the inverter. The second shut-off device is connected to the first shut-off device in a two-way communicable manner, is driven by an electrical power supplied from the first shut-off device, and cuts off a connection between the plurality of solar cell module groups connected to a second electric path in response to a second control signal from the first shut-off device.

Abstract: A control apparatus for a working vehicle includes a travel circuit HC1 formed through a closed circuit connection of a variable displacement hydraulic pump driven by an engine and a variable displacement hydraulic motor, a work circuit HC2 that includes a work hydraulic pump driven by the engine and a work hydraulic actuator that operates by pressure oil from the work hydraulic pump, a relief valve that relieves high pressure oil of the travel circuit HC1, a rotation speed control unit that controls the engine rotation speed in correspondence to an accelerator pedal operation amount, a state detection unit that detects a vehicle state of high load travel and high load work, and a speed limitation unit that reduces an engine rotation speed upper limit when the vehicle state of high load travel and high load work is detected.

Abstract: There are provided: an HST hydraulic circuit that is formed through a closed circuit connection of a variable displacement hydraulic pump 2 and first and second variable displacement hydraulic motors 3 and 4; a charge pump 6 that replenishes the HST hydraulic circuit with hydraulic oil; a cooling circuit through which an excess of the hydraulic oil that has been replenished from the charge pump 6 to the HST hydraulic circuit is returned to a reservoir through the hydraulic pump 2, the first hydraulic motor 3, and the second hydraulic motor 4; a hydraulic source 7 that supplies hydraulic oil to an hydraulic device other than the first and second hydraulic motors; and a merge circuit through which a portion of hydraulic oil from the hydraulic source 7 is merged into an intermediate oil line 22 that lies downstream of the first hydraulic motor 3 and upstream of the second hydraulic motor 4 in the cooling circuit.

Abstract: There are provided: an HST hydraulic circuit that is formed through a closed circuit connection of a variable displacement hydraulic pump 2 and first and second variable displacement hydraulic motors 3 and 4; a charge pump 6 that replenishes the HST hydraulic circuit with hydraulic oil; a cooling circuit through which an excess of the hydraulic oil that has been replenished from the charge pump 6 to the HST hydraulic circuit is returned to a reservoir through the hydraulic pump 2, the first hydraulic motor 3, and the second hydraulic motor 4; a hydraulic source 7 that supplies hydraulic oil to an hydraulic device other than the first and second hydraulic motors; and a merge circuit through which a portion of hydraulic oil from the hydraulic source 7 is merged into an intermediate oil line 22 that lies downstream of the first hydraulic motor 3 and upstream of the second hydraulic motor 4 in the cooling circuit.

Abstract: There are provided: a travel circuit HC1 that is formed through a closed circuit connection of a variable displacement hydraulic pump 2 driven by an engine 1 and a variable displacement hydraulic motor 3; a work circuit HC2 that includes a work hydraulic pump 4 that is driven by the engine 1 and a work hydraulic actuator 114, 115 that operates by pressure oil from the work hydraulic pump 4; a relief valve 14 that relieves high pressure oil of the travel circuit HC1; a rotation speed control unit 10, 18 that controls the engine rotation speed in correspondence to an operation amount of an accelerator pedal 9; a state detection unit 21, 22 that detects a vehicle state of high load travel and high load work; and a speed limitation unit 10 that reduces an upper limit of engine rotation speed when the vehicle state of high load travel and high load work is detected by the state detection unit 21, 22.