Md anderson project No. XX-XXXX md anderson project name



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+5% unbalanced. The parallel load-sharing function shall be resident and redundant within each MMU, and shall not require master oscillators or controls located in the System Control cabinet to provide this function.

  • Battery Protection. The inverter shall be provided with monitoring and control circuits to protect the battery system from damage due to excessive discharge. Inverter shutdown shall be initiated when the battery voltage has reached the end of discharge voltage. The battery end-of-discharge voltage shall be calculated and automatically adjusted for partial load conditions to allow extended operation without damaging the battery. Automatic shutdown based on discharge time is not acceptable.

            1. System Control Console. The System Control Console shall denote the monitoring and controlling circuitry for the system level functions. The system control logic shall be physically berried and separated from the power section and high voltage hazards. The control panel shall be located on the control section door.

            2. System Power Section. The system power section shall be installed adjacent to the system control console section. It shall contain the static bypass switch, the system bypass breaker and the UPS output circuit breaker. The static bypass switch is the solid-state device that automatically transfers the critical load to bypass without interruption if the UPS Modules cannot supply continuous, regulated power to the critical bus. The static bypass switch shall be of the energy-saving type. Once the load is transferred to the bypass line by the static bypass switch, the motor-operated system bypass circuit breaker shall automatically close, removing the static bypass switch from the power flow. The static bypass switch shall be rated as either Momentary Duty, or Continuous Duty.

              1. Momentary Duty Static Switch. The static bypass switch shall be rated to provide up to 1000% of rated capacity subcycle and up to 500% of rated load for three cycles. In addition, the static bypass switch shall be capable of transferring full rated load from the UPS module output to the bypass power source.

              2. Continuous Duty Static Switch. The static bypass switch shall be rated to provide up to 1000% of rated capacity subcycle and up to 500% of rated load for three cycles. The static switch shall be capable of transferring the full rated load from the UPS module output to the bypass power source. In addition, should a bypass circuit breaker fail, the static switch shall be capable of continuously carrying the full rated load as long as necessary without sustaining damage to itself. The static bypass switch shall be draw-out mounted.

              3. System Bypass and UPS Output Circuit Breakers. The system power section devices shall include motor-operated circuit breakers, self protecting in case of a fault in the distribution system. Series-rated devices shall not be used for this purpose unless specifically approved by the Engineer.

            1. System Bypass Operation. For times when maintenance is required or the inverter cannot maintain voltage to the load due to sustained overload or malfunction, a bypass circuit shall be provided isolating the inverter outputs from the critical bus and providing a path for power directly from an alternate AC (bypass) source. The UPS control system shall constantly monitor the availability of the system bypass circuit to perform a transfer. The system bypass circuit shall consist of a static bypass switch, a UPS output circ

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