SJE-Rhombus SP6R-LSC
ENGINEERING SPECIFICATIONS
(07/20/2004)

I.	General
The set point level controller shall be a self-contained microprocessor controlled system capable of monitoring any 4-20 mA signal and automatically controlling two pumps.  The analog input channel shall have a 0.1% resolution and incorporate noise filtering and averaging.  An on board 24 VDC excitation voltage shall be available to power a 2 wire, 4-20 mA submersible pressure transducer.  Each relay output channel shall provide a normally open and a normally closed potential free contact and shall be capable of switching 10A at 250 VAC.
The controller shall be capable of displaying the measured level on a 8-character alphanumeric LED display and 20-segment bar graph.  The 8-character display shall be of avionics grade and shall remain sharp and clear when viewed from 10 feet away in all lighting conditions. The controller shall be capable of automatic alternation of two pumps and monitoring of low level, high level, pump run status, pump seal failure, and pump over-temperature.  The level controller shall also be capable of level simulation and logging run time and start cycles for each pump.

II.	Analog input
The controller shall come standard with a 4-20 mA input channel.  The input shall be scalable from 0.0 to 999.9 and the measurement unit shall be selectable in Feet (FT), Inches (In), Meters (M) or Centimeters (cm).  The bar graph shall also be scalable to indicate the level of the well in percentage (5% per bar). The controller shall detect invalid sensor readings and open loop circuit, display a fault message, and de-energize the pump control relay outputs.

III.	Digital inputs
The controller shall come standard with 6 dedicated input channels.
1.	Pump 1 running  (from motor starter auxiliary contact)
2.	Pump 2 running (from motor starter auxiliary contact)
3.	Pump 1 seal fail (from moisture detection module)
4.	Pump 2 seal fail (from moisture detection module)
5.	Pump 1 thermal cut off (from thermal switch in pump motor)
6.	Pump 2 thermal cut off (from thermal switch in pump motor)

All inputs shall be switched via potential free contacts.  There shall be an alarm reset button below the pump status indicator lights for clearing level and pump alarms when configured as latching faults.

IV.	Relay outputs
The controller shall come standard with 4 SPDT relay outputs and shall each have an energized state indicator.  Each output capable of switching 10A at 250 VAC.
7.	Low level alarm
8.	High level alarm
9.	Run pump 1 (to motor starter)
10.	Run pump 2 (to motor starter)

V.	Level set points

The pump operation and alarm status shall be dependent on the following level set point:
1.	Low level alarm
2.	Stop level (lead pump)
3.	Stop level (lag pump)
4.	Start level (lead pump)
5.	Start level (lag pump)
6.	High level alarm

Level adjustments shall be accomplished via the front keypad without the use of tools, a laptop computer or extensive configuration.  Pump operation shall be configurable for pump up or pump down (filling or emptying) applications relative to the level measurement. 

VI.	Display / Keypad
The controller shall allow the user to navigate through the configuration mode and adjust set point values via the front keypad.  The controller setup shall be simple and shall not require the use of a laptop computer. A simulation mode shall be available for users to manually increase or decrease the level value from the keypad as to test the relay output sequence operation.  The simulation mode shall end automatically when the user releases the keypad buttons and the actual level monitoring is resumed.

VII.	Power
The controller shall require a 22 – 26 VDC power source (.2A nominal/.4A maximum) for proper operation.  Optional power supply shall be made available from the manufacturer to convert 110VAC to 24VDC.  Such power supply shall be approved, registered and /or certified by Underwriters Laboratories (UL).
The controller shall internally provide 24 VDC (30 mA) for powering analog transducers.

VIII.	Enclosure and Environmental
The system shall be housed in a durable aluminum enclosure with provisions for door mounting.
Dimensions: 9.0” W x 5.0” H x 2.5” 
Environmental: The system shall function over an operating range of 0oF to 155oF at up to 0-90% RH non-condensing.  The system may be stored with the temperature range of 
–10oF to 160oF.

IX.	Manufacturer
The level controller shall be as manufactured by SJE-Rhombus, model SP6R-LSC.