Assessments - 2, GPA: 5 ( )

Fabricante : Bosch Arquivo Tamanho: 1.17 mb Arquivo Nome : Língua de Ensino:

This should be done both phase-to-phase and phase-to-ground. 7. MOTOR OVERLOAD PROTECTION: The pump motor is protected from locked rotor and running overloads by a thermal overload integrally mounted to the motor. No adjustments are required. Check to determine that all grounding connections are made properly 8. If a panel is used, remove all debris, scrap wire, etc., from the control panel interior before closing the doors. Install covers, close doors making certain that no wires are pinched and that all enclosure parts are properly aligned and tightened. ENERGIZING THE CONTROL PANEL OR BREAKER FOR THE FIRST TIME IS POTENTIALLY DANGEROUS. LICENSED ELECTRICAL PERSONNEL SHOULD BE PRESENT WHEN THE PANEL OR BREAKER IS ENERGIZED FOR THE FIRST TIME. IF FAULTS CAUSED BY DAMAGE OR POOR INSTALLATION PRACTICES HAVE NOT BEEN DETECTED, SERIOUS DAMAGE CAN RESULT WHEN POWER IS APPLIED (REFER TO SECTION 5). 4-4 FLOAT SWITCHES 1. The pump's on and off cycles are normally controlled by a "piggy back" float switch attached to the side of the pump, or by hanging switches in the wet well. Refer to panel or switch instructions for proper electrical connection 4-4.1 FLOAT SEQUENCE- PIGGY BACK (AUTOMATIC MODELS LSG202A & LSGX202A) 1. As the liquid level in the wet well rises, the float tilts, closing the switch. This starts the pump. 2. The pump runs until the liquid level falls below the “PUMP OFF” level of the float (Factory set at 7" minimum), emptying the wet well. 4-4.2 FLOAT SEQUENCE- SIMPLEX (MANUAL MODELS) 1. As the liquid level in the wet well rises, the “PUMP OFF” float tilts, closing the switch (This level must be set at a minimum of 7"). As the liquid level continues to rise, the “PUMP ON” float tilts. This switch closes, starting the pump. 2. The pump runs until the liquid level falls below the “PUMP OFF” float, emptying the wet well. 3. In the event of a malfunctioning float switch, control relay or pump, the liquid level rises and tilts the “HIGH LEVEL ALARM” float. The alarm system will activate. 4-4.3 FLOAT SEQUENCE-DUPLEX (MANUAL MODELS) 1. As the liquid level in the wet well rises, the “PUMP OFF” tilts, closing the switch. As the liquid level continues to rise, the “LEAD PUMP ON” float tilts. This switch closes, starting the lead pump. The pump runs until the liquid level falls below the “PUMP OFF” float, emptying the wet well. 2. On the next rise of the liquid level, the other pump will start on the “LEAD PUMP ON” signal. The pumps will continue to alternate their cycles. NOTE: No ON/OFF float switch differential should be set that will exceed 12 starts per hour. 3. If the liquid level rises to the “LAG PUMP ON" float, the second pump will start. Both pumps will run until the liquid falls below the “PUMP OFF” float, emptying the wet well. 4. In the event of a malfunctioning float switch, control relay or pump, the liquid level rises and tilts the “HIGH LEVEL ALARM” float. The alarm system will activate. 4-4.4 FLOAT SWITCH INSTALLATION The engineeri...

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