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Topic: carmax 行車紀錄器 說明書你好朋友！请帮助我，我正在寻找 carmax 行車紀錄器 說明書. 我在哪里可以找到并免费下载？ 89 Adams SMI 12.06.2020 21:53
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Re: carmax 行車紀錄器 說明書Messages: 6Pages 0
Type 3AH35-MA magnetic-actuator operator The type SDV7 distribution circuit breaker is available with a magnetic-actuator operator. The basic configuration of the circuit breaker is the same as for the stored-energy version, including the high-voltage elements and the vacuum interrupters, with only the operating mechanism replaced. The type 3AH35-MA magnetic-actuator operator employs rare-earth magnets (neodymium-iron-boron) to maintain a stable CLOSED position, in combination with an electromagnetic coil structure to change from the OPEN position to the CLOSED position. The magnetic actuator uses a single coil design, providing a stable OPEN and a stable CLOSED position without supplemental energy input. The electronic controller provides a substantial current to the electromagnetic coil for closing operation, so that the electromagnetic force adds to the magnetic force provided by the rare-earth magnets. For opening, only a modest electromagnetic force is needed, in the reverse direction, to offset the magnetic force provided by the rare-earth magnets. In effect, the electromagnetic force cancels the magnetic force during opening operations. The force for opening primarily is provided by the contact pressure springs on each phase (not shown) with an assist from the opening spring. The opening spring is the same as used on the stored-energy version, and its primary function is to provide the force to oppose the force of atmospheric pressure on the vacuum interrupter bellows, which would otherwise cause the contacts of the open circuit breaker to close. The field diagrams of the magnetic actuator illustrate the combined magnetic and electromagnetic field conditions in the various circuit breaker positions. Magnetic-actuator electronic controller The operation of the magnetic actuator is controlled by an electronic module. The electronic module receives power from a 24 Vdc power supply, stores energy in capacitors on several printed circuit boards, and provides a variety of functions, including:
The electronic controller allows for circuit breaker reclosing according to the standard reclosing duty sequence in ANSI/ IEEE C37.04, O – 0.3 s – CO – 15 s – CO. The capacitors used to power circuit breaker opening and closing actions recharge following operations as follows:
When first energized, the capacitors require approximately 35 s to obtain full charge. The electronic controller is designed for harsh environments and long life. The estimated life of the electronic controller is approximately 20 years with an ambient environment outside the circuit breaker enclosure of 50 °C or less. In an environment less harsh than this, the expected life is well in excess of 20 years. The capacitors used have a life expectancy of 45 years with an ambient environment at the capacitors of 70 °C (3% of total hours), 50 °C (40% of total hours), with the remaining 57% of total hours in an ambient of 40 °C or less. In an environment less harsh than this, the expected life is well in excess of 45 years. The capacitor boards are generously sized, with energy storage above the level needed to operate the circuit breaker. In fact, the system can open and close the circuit breaker if as much as 20% of the capacitors are disabled. The capacitors have reserve energy such that the circuit breaker can be electrically opened using the pushbuttons on the operator for at least 300 seconds after control power is lost. The power supply for the electronics circuits accommodates a wide range of input voltages. The high-range power supply accepts any voltage in the range of 110 Vac to 240 Vac or 110 Vdc to 250 Vdc. The low-range power supply accepts voltage in the range of 28 Vdc to 56 Vdc. Electrical close and open commands operate through binary inputs, with the high-range command input version requiring input of at least 68 Vac or 68 Vdc for operation, while the low-range command input version requires input of at least 17 Vac or 17 Vdc for operation. Automatic monitoring The electronic controller includes monitoring and self-test functions, among which are these:
The electronic controller also maintains a log, which includes details of the last 32 operations and results of capacitor capability tests. Built-in fast-discharge circuit for capacitors The controller system design includes built-in means to discharge the capacitors if maintenance is to be performed. There is no need for the user to provide jumper wires or loading resistors to discharge the capacitors – simply disconnect the plug between the electronic controller board and the capacitor boards, and the discharge circuit is automatically enabled, discharging the capacitors to a low level to enable maintenance. The NEC (NFPA 70) requires discharge to below 50 Vdc within five minutes, but the system incorporated in the type SDV7-MA magnetic actuator design discharges to less than 5 Vdc in approximately 90 seconds. When control power is initially energized, the controller executes a start-up routine, after which charging of the capacitors will begin. When control power is first applied, a green LED on the power supply is illuminated. The controller includes LEDs to indicate the energy status of the capacitor bank. From complete discharge, approximately 25 seconds after control power is applied, a yellow LED lights up, and approximately 5 to 10 seconds later, the yellow LED goes off and a green LED will illuminate. The LEDs indicate status as follows:
External manual trip handle An external manual trip handle is provided as standard on the type SDV7-MA and type SDV7-MA-AR with magnetic-actuator operator. The external manual trip handle requires only a modest force to operate it, and once the circuit breaker is opened, the handle can be padlocked to provide a lockout function and prevent closing of the circuit breaker either by electrical means or by manual means. |
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