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LSC12 Control Panel Specifications
Download LSC12 Control Panel Engineering Specs Document (rtf format) I. General
1.1 Scope Of Work
The contractor shall furnish and install a pump control system designed to operate two pumps in a sewage lift station as described herein. The control system shall be designed to utilize proven technology in control design for sewage lift stations. The control system shall be operator and maintenance friendly to ensure ease of system set up and to limit down time. The pump control system shall be capable of operating 2 pumps at ___HP, ___ Voltage, ___ full load amps (FLA), single phase. The control system shall use a submersible pressure transducer connected to an electronic liquid level indicator/controller mounted in a control panel.
The factory assembled system shall include:
-Submersible pressure transducer
-Liquid Level Indicator/Controller
-Enclosure
-Motor starters
-Alarms and sensors as specified herein
These specifications describe Model LSC12 as manufactured by SJE-Rhombus, Detroit Lakes, Minnesota, or approved equal.
II. Products
2.1 General
2.1.1 Codes
Electrical equipment, materials and workmanship shall comply with all applicable codes, safety and fire law regulations at the location of the work and shall conform to applicable codes and standards of the organizations listed below.
1. Institute of Electrical and Electronic Engineers (IEEE)
2. National Electric Code (NEC)
3. National Electrical Manufacturers Association (NEMA)
4. American National Standards Institute (ANSI)
5. Underwriters Laboratories (UL-508)
6. International Electrotechnical Commission (IEC)
2.1.2 Component Standards
All equipment and materials shall be new and shall bear the manufacturers name and trade name. In cases where the standard has been established for the particular material, the material shall be so labeled. The equipment to be furnished shall essentially be the standard product of a manufacturer regularly engaged in the production of the required type of equipment for this type of work and shall be the manufacturers latest approved design.
2.2 Construction
2.2.1 Enclosure
The described equipment shall be housed in a single NEMA 4X engineered thermal plastic enclosure. The enclosure size shall be approximately 18 high, 16 wide, 10 deep. Pilot and indicator devices shall be mounted on a hinged inner door.
2.2.2 Hinged Inner Door
The hinged inner door shall be fabricated from brushed aluminum. It shall be grounded and held closed by 2 hand operated fasteners. All Pilot and indicator devices shall be clearly labeled with engraved nameplates.
2.2.3 Control Circuit Wiring
Control circuit wiring inside the panel shall be 18 gauge (AWG) minimum, type MTW or THW, rated for 300 volts. All power wiring shall be rated for 600 volts. Conductors shall be color coded in the same colors throughout the entire panel. All components shall be identified with a numerical or alphabetical reference. The component identification labels shall match the ones shown on the electrical schematics.
III. Components
3.1 Liquid Level Indicator/Controller
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 or 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. The controller shall be capable of automatic alternation of two pumps and of monitoring 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 of logging run time and cycles for each pump.
3.1.1 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 from 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 outputs.
3.1.2 Digital Inputs
The controller shall come standard with 6 dedicated input channels.
- Pump 1 running (from motor starter auxiliary contact)
- Pump 2 running (from motor starter auxiliary contact)
- Pump 1 seal fail (from moisture detection module)
- Pump 2 seal fail (from moisture detection module)
- Pump 1 thermal cut off (from thermal switch in pump motor)
- 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.
3.1.3 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.
- Low level alarm
- High level alarm
- Run pump 1 (to motor starter)
- Run pump 2 (to motor starter)
3.1.4 Level Set Points
The pump operation and alarm status shall be dependent on the following level set point:
- Low level alarm
- Stop level (lead pump)
- Stop level (lag pump)
- Start level (lead pump)
- Start level (lag pump)
- High level alarm
Level adjustments shall be accomplished via the front keypad without the use of special equipment, laptop computer or extensive configuration. Pump operation shall be configurable for pump up or pump down applications relative to the level measurement.
3.1.5 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 special equipment or 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.
3.1.6 Power
The controller shall require 22 26 VDC (.2A nominal/.4A maximum) for proper operation. A power supply shall be made available from the manufacturer to convert 110 VAC to 24 VDC. Such power supply shall be approved, registered and /or certified by the Underwriter Laboratory (UL). The controller shall internally produce 24 VDC (30mA) for powering analog transducers.
3.1.7 Enclosure and Environmental
The controller shall be housed in a durable aluminum enclosure with mounting brackets for door mounting.
Environmental: The controller shall function over an operating range of 0 o F to 155 o F at up to 0-90% RH non-condensing. The controller may be stored with the temperature range of 10 o F to 160 o F.
3.1.8 Manufacturer
The level controller shall be as manufacturered by SJE-Rhombus, Model SP6R-LSC.
3.2 Standard Features
The following devices shall be included as standard features with each Model LSC32 control system:
-SP6R-LSC Indicator/Controller
-(1) Digital level display
-(1) Level bar graph
-(2) Green pump run LED's
-(2) Amber pump seal fail LED's
-(2) Red pump over temperature LED's
-(2) Run time meters
-(2) Cycle counters
-(1) Fault reset button
-(1) Pump alternation
-(1) Lead Pump selector switch (1,2-Alt-2,1)
-(1) Level simulation button with auto reset
-(2) Motor circuit breakers
-(2) Motor Starters (IEC)
-(2) Hand-Off-Auto selector switches
-(2) Moisture detection modules (seal fail)
-Alarm Test / Normal / Silence switch
-Alarm Beacon and horn
-Space heater to prevent condensation within the enclosure
-Serialized UL-508 Label
3.3 Circuit Breakers
All pump circuits shall be protected by molded case circuit breakers. Each pole of the breaker shall provide inverse time delay overload protection and instantaneous short circuit protection by means of a thermal magnetic element.
The breaker shall be operated by a toggle-type handle and shall have a quick make, quick break switching mechanism that is mechanically trip free from the handle. Tripping due to overload or short circuit shall be clearly indicated by the handle automatically assuming a position midway between the manual on and off position. Breakers shall be completely enclosed in a molded case and shall bear the UL label.
3.4 Motor Starters
All starters shall be full-voltage non-reversing IEC style and bear a UL label. The coil operating voltage shall be 120 Volts AC 60 Hz. All starters shall be complete with ambient compensated overload relays of the bi-metallic type. The overload relays shall be equipped with an electrical isolated normally open contact to annunciate a motor overload condition.
3.5 Relays
3.5.1 Relay Type
Relays shall be of the square base plug-in type with integral LED indicator lights. All relays shall have a transparent polycarbonate dust cover to protect the contact surfaces from airborne dust and other contaminants. All relays shall have DPDT or 4PDT contacts, as required. Relays shall be rated for continuous duty operation.
3.5.2 Relay Contacts
Relay contacts shall be rated for 10 amps at 250 VAC. Relay sockets shall have screw terminals with self-lifting clamps and terminal identification numbers located at each connection on the relay socket.
3.6 Lighting Arrestor/Surge Arrestor
A lighting/surge arrestor shall be provided at the incoming power terminals to the control panel. The unit shall be of the solid state type and be able to clamp in five (5) nanoseconds and absorb up to 10KA peak surge current during an occurrence.
3.7 Alarms
High level alarm beacon and a horn shall be included with a test/normal/silence switch. On decreasing levels, the alarm condition will automatically reset when the level falls below the high level alarm set point (may be configured for manual reset via controller).
3.8 Back Up Float Switches
Two back up float switches shall be provided with each control system. A high level float to activate the beacon and horn and a low level float to prevent the pumps from running dry. The high level alarm float shall be directly connected to the alarm circuitry and the low level float shall disengage the motor starters in the down position (open circuit). The floats switches shall be as manufactured by SJE-Rhombus model Sensor Float® control switch or approved equal.
3.9 Monitors
3.9.1 Seal Failure Relays
Seals Failure relays providing adjustable resistance sensing circuitry from 0 to 250,000 ohms for each pump shall be supplied. Upon activation, the seal failure relay shall not shut down the pump, but shall illuminate a red pilot light located on the SP6R-LSC controller mounted on the inner door. The controller shall also be configurable to shut down the pump or operate during a lag condition only upon a seal fail condition. The moisture sensing probes shall be supplied and installed in the pumps by the pump manufacturer.
3.9.2 Over Temperature Sensing Relays
Pump over temperature sensors located in the pump motor shall be supplied for each pump. A pump high temperature condition in a pump shall illuminate a red pilot light on the SPR6-LSC controller mounted on the inner door and activate the main alarm. This fault shall remain until the the motor cools sufficiently and the reset push button on the controller is pressed.
IV. Quality Assurance
4.1 Manufacturer Experience
4.1.1. UL Certification
The manufacturer of the control system shall be certified by Underwriters Laboratories (UL) as being a UL 508 Listed manufacturing facility and certified to install a serialized label for quality control and insurance liability considerations.
4.1.2 Experience
The manufacturer of the control system must be able to document ten years of experience in successfully designing and manufacturing similar control systems for wastewater pumping applications.
4.2 Manufacturer Quality Control
The complete control system shall be functionally tested at the manufacturing facility and certified as a complete system to assure proper operation per specification.
4.3 Manufacturer Approval
Manufacturers listed in this specification do not constitute approval. All controls must have the capabilities and functions as outlined in the specifications.
V. Submittal Requirements
5.1 Base Bid
The base bid control system shall be the Model LSC12 control system as manufactured by SJE-Rhombus, Detroit Lakes , Minnesota . Contract shall be awarded on the base bid control system. Alternative deductive systems will be considered only after contract award and must be specified with any applicable deducts at bid time in order to receive consideration. Bidders submitting alternate quotations shall submit appropriate cut sheets, circuit drawings and a detailed bill of materials with their alternate bid packages. Approval of an alternative system shall be at the sole discretion of the engineer. All equipment and materials shall be new and shall be specifically designed for the function herein.
5.2 Substitutions
The Engineer will consider proposals for substitution of materials, equipment, methods and services only when proposals are accompanied by full and technical data and all other information required by the Engineer for the proposed substitution. Substitution of materials, equipment, methods and/or services is not allowed unless such substitution has been specifically approved by the Engineer.
5.3 Shop Drawing Submittals
5.3.1 Drawing Requirements
All drawings are to be of the computer generated class.
5.3.2 Engineering Approval
The Engineer reserves the right to approve or disapprove any and all equipment during the evaluation process. Approval for fabrication and installation will be made only after submittal and review of all shop contract documents. The information required for approval shall include the following items and be provided in (8) sets as a minimum:
- Component cut sheets
- Complete electrical schematics detailing the system
- A complete bill of material
- Detailed drawings of the enclosure
- Exploded detail of every control face plate, light, switch or meter mounted on the exterior of the enclosure.
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