Performance/Operating Specifications Stancor’s Oil Minder Duplex control is intended to control two submersible pumps for the purpose of maintaining sump pit liquid levels. The unique features offered by the Oil Minder System are the ability to sense oil floating on the top of the water, and preventing the pumps from ejecting this oil into sewers, rivers, and waterways. In addition, the system provides for separate alarms in the event of an oil spill, high liquid level condition, or overcurrent condition due to a pump fault.The duplex system provides additional advantages which include equalized wear on each of the pumps, stanby protection if one pump fails, and added pumping capability(two pumps running) for peak inflow conditions. The main float (lead pump on float) will rise (close) when the liquid level increases in the sump pit. Pump #1 contactor should close to allow the pump to discharge the liquid as long as the oil sensor has a resistance to ground lower than the set point (i.e., the oil sensor is in conductive water and normal operation is allowed). The pump relay will open when the liquid level drops below the oil sensor probe tip (pump off). There is a one (1) second time delay after the liquid level drops below the oil sensor probe tip. At this point, the oil sensor probe voltage drops from 5VDC to 15 millivolts DC until the “pump-on” float rises again, at which point the oil sensor input voltage returns to 5VDC. The 15 millivolt input greatly reduces the potential field and subsequent metal ion exchange, thus preventing build up of foreign matter on the probe surface. When the pump on float rises again the alternator will activate Pump #2. The alternator allows for equal wear on each of the pumps. If water level continues to rise and raises float #2 (high level alarm float / lag pump start float), the lag pump contactor will be energized until water level drops below the oil-minder probe (pump's stop sensor).. If float number #2 rises both pumps are activated. If the water condtion continues and the two pumps cannot bring down the water level below float #2 The alarm/RMS will activate after the time set point is reached (The point timer, RMS alarm delay is adjustable between .1 to 10 minutes). If the main float is closed, and the oil sensor measures a higher resistance than its set point; the pump is disabled and the oil LED, audible alarm, and remote alarm relay are energized. This failure condition is latching, and may only be cleared by returning the oil sensor to a conductive fluid, and pushing the reset button; or removing and reap- plying power. Other system features include overload protection and high level liquid alarming. The overload feature measures the motor current to determine if a locked rotor or other high-current condition exists. The maximum acceptable normal running amperage is set by pot on the thermal overload relay faceplate. The NEMA trip class 10 overload curve is followed for tripping in the event that the motor amperage exceeds its trip point. In the event of an overload; the motor is disabled, while the overload LED is energized. Systems configured in automatic mode will reset after 10 minutes. The 10 minute restart may be bypassed by depressing the reset button. Automatic mode or manual mode is visually indicated by a solid overload LED. The high level liquid alarm is enabled by an additional float (high level alarm float / lag pump start float) placed at a level in the pit above normal acceptable liquid levels. The rising of this float (closing) will cause the controller to energize the audible alarm, remote alarm relay, and the high level LED.The buzzer will follow the RMS delay when high level fault occurs. If an Oil Fault occurs, the buzzer will still alarm immediately, however, “high level” faults should not alarm until thee RMS delay has expired. The high level alarm will only be de-energized after the high level float drops to its normal state (open). The high level liquid alarm will not disable the pump motor from normal operation. In a high level alarm condition, the remote alarm relay will cycle on and off with 0.5 seconds on, and 0.5 seconds off. An additional silence alarm button is provided to de-energize the audible alarm for the convenience of maintenance personnel. Depressing this button will not clear any fault, but merely silence the alarm. If a fault is removed and returns, the audible alarm will reenergize as expected.