1995-08-11_REVISION - M1977493 (12)

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Pump #2 - Primary level control for this pump is provided by a discrete set point relay with an adjustable deadband. This relay will provide Hi-level water control in the shaft. The pump will start when the water level raises to the discrete set point and stop when the water level falls below the deadband value. A secondary level control for this pump is provided by a General Electric resistance sensitive relay. The level relay is hardwired to the #2 pump and provides back-up Hi-level control. These level control devices will be used to control a high level condition in the shaft and will be set at elevation 11,058 feet, a position 87.5 feet below the platform. Pump #3 - Primary level control for this pump is provided by a discrete set point relay with an adjustable deadband. This relay will provide Hi-Hi level water control in the shaft. The pump will start when the water level raises to the discrete set point and stop when the water level falls below the deadband value. A secondary level control for this pump is provided by a General Electric resistance sensitive relay. The level relay is hardwired to the #3 pump and provides back-up Hi-Hi level control. These level control devices will be used to control a HI-HI level condition in the shaft and will be set at elevation 11,072 feet, a position 73.5 feet below the platform. INDICATION Motor Running - Pump motor running indication is provided on the door of the VSD. A red motor running indication light is located beside each full voltage motor starter. Individual motor running signals are transmitted to the mill control room for remote indication. VSD Mode - The VSD indication light located on the door of the bypass cabinet is lighted to indicate that the motor will run as a variable speed motor when started. Bypass Mode - The Bypass indication light located on the door of the bypass cabinet is lighted to indicate that the motor is running full speed across the line through the bypass cabinet. Auto Mode - The Auto indication light located on the door of the bypass cabinet is lighted to indicate that the motor will run as a variable speed motor when started and revert to across the line when a VSD fault occurs. Motor Amps - Motor running amps is shown on a meter on the door of the VSD. Motor Hertz - A frequency meter is located on the door of the VSD. Water Level - Local water level indication is provided on the face of the Miltronics Airanger located at the pump platform. An analog water level signal is transmitted to the mill control room for remote indication via the PLC.