SECTION 16900 - CONTROLS AND ALARMS
PART 1 GENERAL
1.1 DESCRIPTION
1. Work Included: Work specified in this section shall include the furnishing and installation of all equipment required for controls and alarms. All systems shall be complete, assembled, tested, adjusted, and demonstrated to be ready for operation prior to acceptance.
2. Related Sections:
1) Section 16050 - Basic Electrical Materials and Methods
2) Section 16400 - Service and Distribution
1.2 REFERENCES
1. General: The work shall comply with the most recent standards or tentative standards as published at the date of the contract and as listed in this specification using the abbreviation shown.
2. National Electrical Manufacturers’ Association (NEMA):
1) 250-1979 Enclosure Description and Application
1.3 SUBMITTALS
1. General: Comply with the provisions of Section 01300.
2. Shop Drawings: A complete set of drawings shall be supplied to insure successful installation and operation of the control system. The shop drawings shall consist of all of the following:
1) Sufficient detail to evaluate compliance with these specifications.
2) A detailed component list including manufacturer and catalog number.
3) A custom wiring diagram for this specific application to facilitate and insure accurate field connections to the control panel by electrical installation personnel.
4) A description of operation for the control system.
5) An enclosure dimension print.
1.4 QUALITY ASSURANCE
1. General: The equipment provided shall be a completely integrated control systems consisting of the required power equipment (motor starters, circuit breakers, variable frequency drives, etc.), automation and monitoring equipment in a factory wired and tested assembly. All level transducers, control and monitoring equipment, and software furnished shall be standard catalogued products of the system supplier to assure single source responsibility. Non-manufacturers or companies who integrate components manufactured by others are not acceptable. Not less than eighty percent by dollar volume of all equipment furnished shall be standard catalogued products of the system supplier. The equipment shall be provided directly to the CONTRACTOR by the manufacturer or his contractually recognized and authorized representative who shall be responsible for the administration of the warranty. The manufacturer shall furnish a letter with submittals verifying the local representative and that the equipment is being supplied as described above.
2. U.L. Listing: The equipment specified in this Section shall be constructed in a UL 508 and UL 913 listed controls manufacturing facility. The manufacturer shall provide certification of both ratings with submittals. Manufacturers which are listed as only as a UL 508 shop shall not be acceptable. The equipment shall bear the appropriate UL serialized label indicating the equipment supplied for this project shall be constructed in accordance with the practices and requirements of UL.
PART 2 PRODUCTS
2.1 CONTROLS
1. General: The control system shall consist of a wet well level sensing submersible level transducer system, direct acting float switches, remote pump control panels, and a central pump control panel with integrated power and automation equipment. The transducer and direct acting float switch shall sense and transmit the wet well level signals to the central pump control and alarm/monitoring panel. The control/alarm/monitoring panel shall receive the wet well level signals and provide level responsive pump/variable speed drive control. The controls shall be housed within a NEMA 1A gasketted enclosure. The automatic pump/variable speed drive control system shall provide digital liquid level indication, alarm setpoint adjustments, control setpoint and variable speed drive ramp and timing adjustments, automatic pump/drive alternation and alarm/monitoring as herein specified. The pump controls shall be provided to operate three (3) pumps. The system shall be similar to a Bulletin A1000/D620/D800 as manufactured by US Filter Control Systems or preapproved equal.
2. Incoming Service and Lightning Arrestor: The incoming service for the control system shall be 480 volt, 3 phase, 4 wire, 60 Hertz. A three phase lightning arrestor shall be supplied in the control system and connected to each line of the incoming side of the power input terminals. The arrestor shall protect the control system against damage as the result of transient voltage surges caused by lightning interference, switching loads and power line interferences.
3. Wiring: All wiring shall be minimum 600 volt UL type MTW or AWM and have a current carrying capacity of not less than 125% of the full load current. The conductors shall be in complete conformity with the National Electric Code, state, local and NEMA electrical standards. For ease of servicing and maintenance, all wiring shall be color coded. The wire color code shall be clearly indicated on all submittal and as-built drawings, with color indicated.
All control wiring shall be contained within wiring duct with covers as manufactured by Panduit or equal. Where dimensional constraints prevent the use of wiring duct, wires shall be trained to panel components in groupings. The wire groupings shall be bundled and tied not less than every three inches with nylon self locking cable ties as manufactured by Panduit or equal. Every other cable tie shall be fastened to the enclosure door or inner device panel with a cable tie mounting plate with pressure tape. Where wiring crosses hinged areas such as when trained from the inner device panel to the enclosure door, spiral wrap shall be used.
4. Signal Transient Protection: Transient protection shall be integrally provided with all equipment to protect all instrumentation devices either receiving or sending signals. The transient protectors shall be a three stage surge suppression device which shall effectively arrest most transients encountered in an instrumentation environment. Transient protectors utilizing single or dual stage suppression devices shall not be acceptable.
1) The first stage of the transient protector shall consist of a gas tube arrestor connected across the signal wires and to ground. This stage shall be designed to suppress transients greater than 150 to 300 volts.
2) The second stage of the transient protector shall consist of two varistors each connected between a signal line and ground. This stage shall suppress any transients less than 150 to 300 volts and clamps them to 56 volts.
3) The third stage of the transient protector shall consist of two special purpose, high speed zener diodes which suppress any remaining transients to 51 volts. 50 ohm, 5 watt resistors shall be connected between the stages to dissipate the potential energy of the transients.
5. Transducer: The level of the basin shall be measured by a submersible level transducer with a minimum bottom diaphragm of 2-5/8" providing a 4-20 mA instrumentation signal. The transducer shall be of the solid state head pressure sensing type mounted using a removable cable suspension mounting kit utilizing all stainless steel hardware and cable attached to a 25# plastisol coated cast iron weight. The transducer housing shall be fabricated of type 316 stainless steel. A hydraulic fill liquid behind the diaphragm shall transmit the sensed pressure to a solid state variable capacitance transducer element to convert the sensed pressure to a corresponding electrical value. The sensed media shall exert its pressure against the diaphragm that flexes minutely so as to vary the proximity between an internal ceramic diaphragm and a ceramic substrate to vary the capacitance of an electrical signal created between the two surfaces. A stable, hybrid operational amplifier assembly shall be incorporated in the transducer to excite and demodulate the sensing mechanism. The internal pressure of the transducer assembly shall be relieved to atmospheric pressure through a urethane jacketed hose/cable assembly and a slack PVC bellows mounted in the upper assembly panel. The sealed breather system shall compensate for variations in barometric pressure and expansion and contraction of air due to temperature changes and altitude as well as prevent fouling from moisture and other corrosive elements. The transducer shall be a U.S. Filter/Consolidated Electric Company Model A1000 or preapproved equal.
6. Control System with Integrated Variable Frequency Drives:
1) Enclosure: The described equipment shall be housed in a NEMA 1A gasketted, freestanding enclosure properly sized to accommodate all control elements (approximately 90" high, ___" wide, 20" deep). The enclosure shall include the following features:
a) Oil-resistant door gasket attached with oil resistant adhesive.
b) Ventilation fans and intake vents as required for adequate ventilation, with grills and filters.
c) All major components and sub-assemblies shall be identified as to function with laminated, engraved bakelite nameplates, or similar approved means.
d) An incoming power terminal block shall be provided.
2) Phase Monitor: A phase-loss/unbalanced/reversal, under-voltage protection assembly with adjustable nominal voltage setting shall be furnished with three extractor type line voltage fuses. This device shall lock-out the pump motors if all phases drop below 90% or if one phase drops below 80-83% nominal voltage. This device shall have a 1/2 second dropout delay and adjustable restoration time delay of up to five minutes.
7. Variable Frequency Drives
1) The pump control system shall be supplied with variable frequency drives (VFD) to manually/automatically control the speed of sewage pumps. The VFDs shall be designed for continuous operation and must include the minimum functions, features and ratings.
2) The all VFD components will be mounted in a floor mounted, force ventilated NEMA-1 enclosure.
3) An input circuit breaker shall be supplied for each drive to provide branch circuit protection and a means of disconnecting power. The breaker shall have a through door handle with a padlockable mechanism. In addition fast acting fuses are in the VFD input.
4) The converter stage shall change fixed voltage, fixed frequency AC line power to a fixed DC voltage bus. A DC reactor will be included in all VFDs. Power up in-rush currents to the DC bus, will be controlled by input SCR s. Contactors/ resistors shall not be used for pre-charge circuits. The converter shall be insensitive to input phase rotation.
5) An inverter stage shall change fixed DC voltage to variable voltage, variable frequency 3 phase AC for application to a NEMA design B inverter duty rated motor. The output shall be sine coded pulse width modulation (PWM). The inverter shall use IGBT output devices. The VFD shall have a digital display/keypad. The VFD is to be fully digital with no adjustment potentiometers. The VFD shall be capable of accepting a remote digital display and fieldbus communications.
6) The controller shall be rated to operate in an ambient of 0 degrees to 40 degrees C
continuously at altitudes up to 3,300 feet above sea level.
6) The controller shall be capable of supplying 150% of rated full load current for 1 minute at maximum ambient temperature. The controller shall be designed to operate from a 380V - 10% to 480V + 10% three phase, 50/60Hz supply and control a motor with a corresponding voltage rating. Acceleration and deceleration time shall be independently adjustable from 0 to 3200 seconds per 100Hz.
7) Adjustable full-time current limiting shall limit output current to a preset value not to exceed 150% of the controller rating. The VFD shall have adjustments for motoring current, regenerating current and symmetrical current limits.
8) The controller shall be capable of producing an output frequency 0f 0-1000Hz. The Maximum and Minimum frequencies shall be fully adjustable throughout the range. The VFD shall be provided with an Over Frequency trip at 20% of full-scale frequency. Over/Under frequency detection with adjustable detection points shall also be provided.
9) The VFD shall be capable of restarting into a coasting motor in either the forward or
reverse direction without tripping.
10) Subjecting the VFD to any of the following conditions shall not result in component
failure or the need for fuse replacement:
a) Short circuit at the VFD output
b) Open circuit at the VFD output
c) Input overvoltage or undervoltage
d) Loss of input phase
e) Instantaneous overload
f) Overload of 150%
11) Solid state motor overload protection shall be included such that the current exceeding an adjustable threshold shall activate a timing circuit. Should current reach 150% for 1 minute, the VFD shall trip off and indicate an alarm on the drive display. The trip time will be increased for loads exceeding 105% but less than 150%.
The timing logic shall have a memory such that current exceeding the threshold for less than 60 seconds and dropping back below the threshold momentarily shall not cause the timer to reset to zero but shall cause the timing circuit to pick up at a point dependent on the length of time the current was below the threshold.
12) The VFD shall include slip compensation that is determined by motor nameplate ratings. The VFD shall be capable of operating in Open Loop V/Hz, Open Loop Vector and Closed Loop vector modes with motor auto tune. The following control logic functions shall be included as part of the standard VFD package:
a) 8 preset speeds with independently adjustable acceleration and deceleration rates for each speed.
b) 3 skip frequencies with adjustable bands to avoid speed related resonance.
c) 2 programmable comparator circuits with adjustable threshold and hysteresis
d) PID setpoint controller that operates in full control or trim mode.
e) Run time log and power meter parameters
f) Motorized Pot function
13) The controller shall include static reversing by means of a single contact closure.
14) The controller shall use a digital display to indicate all faults and parameters.
15) Controller logic supplies shall withstand short circuits without damage or fuse blowing.
16) 5 year warranty on the VFD module.
8. Selector Switches And Indicating Lights:
1) A door mounted 1-3/16" diameter "Hand-Off-Auto" 3 position, rotary, oil tight, heavy duty type selector switch shall be furnished for each pump.
2) A door mounted, 1-3/16" diameter oil tight, heavy duty type pilot light operated from a VFD auxiliary contact, shall be provided to indicate a "pump running" condition for each pump. The pilot light shall have a replaceable bulb.
3) A door mounted, 1-3/16" diameter oil tight, heavy duty type pilot light shall be provided to indicate a "pump failure" condition for each pump. The pilot light shall have a replaceable bulb.
9. Condensation Protective Heater: 100 watt, 120 VAC condensation protective heaters with a high temp cutout thermoswitch shall be supplied in the control panel.
10. Running Time Meter: A running time meter measuring hours and tenths of hours of operation up to 99,999.9 hours shall be furnished for each pump motor. This shall be a 120 volt AC device operating from the control voltage by an auxiliary contact of the pump motor starter/VFD.
9. Pump Protective Circuits:
1) Over-temperature protection shall be provided in the control panel to operate in conjunction with the overtemperature switch in each pump motor. The control shall provide pump lockout of operation upon occurrence of high temperature. The circuitry shall also include an overtemperature failure indicating light and manual reset pushbutton on the inner door for each pump for alarm indication and manual reset capability. Both the light and manual reset pushbutton shall be 1-3/16" diameter, oil tight, heavy duty type.
2) Seal failure indication shall be provided in the control panel to operate in conjunction with the seal leak/moisture sensing switch in each pump motor. A pump seal failure alarm condition of each sewage pump on door mounted pilot lights.
3) It is the CONTRACTOR's responsibility to coordinate the pump protection system requirements. The CONTRACTOR shall verify with the pump manufacturer and supplier what the pump motor's protection requirements are. This information shall be given to the pump control panel manufacturer to provide the required interface circuitry. If the pump motor protective systems include the use of special function modules, these shall be provided to the control panel manufacturer to mount, wire and test within the control panel.
10. Microprocessor-based Controller:
1) A Microprocessor-based Controller shall be provided for control of the pumps/VFDs based on the wet well level of the pump station. The controller shall provide up to sixteen-user programmable control stages which shall control the three (3) pumps with variable frequency drives. Variable speed drive ramp control capability shall be provided in the controller, with the ramp output characteristics re-definable for each control stage. Pump and abnormal level alarm setpoint operation shall be determined by an integral user keypad. The controller shall also be remotely linked with the grinder control panel.
2) The Microprocessor-based Controller shall be a standard, catalogued product of a water and wastewater pumping automation equipment manufacturer regularly engaged in the design and manufacture of such equipment. The pump/alarm controller shall be specifically designed for water and wastewater pumping automation utilizing standard hardware and software. "One of a kind" systems using custom software with a generic programmable controller will not be acceptable.
3) The controller shall provide ON/OFF operation and speed control of the pumps/VFDs based on the wet well level as sensed by the previously specified submersible level transducer in a pump-down mode of operation. In general, additional pumping capacity shall be called into operation with an increase in the wet well level. Decreasing pumping capacity shall be called for upon a lowering wet well level. Automatic first-on, first-off alternation shall be provided for the pumps/drives of the station, with integral timeclock alternation sequence advancement. Remote ON/OFF signals shall be sent to the grinder control panels to allow linked pump and grinder operation.
4) The level signal received from the submersible transducer shall be converted to a "feet and hundredths" digital display. Keyboard-configurable digital setpoints shall be provided for differential level-type automatic pump operation as well as automatic alternation and manual sequence selection or timing, variable speed pump/drive ramp control logic and alarm performance as herein described.
5) The Controller shall accept up to three (3) analog signals (1-5 VDC or 4-20 mADC) representing the process variables. It's operating program shall be resident in ROM and include full-scale ranging and pump-up/down determination. The controller shall have expansion capability to operate up to eight (8) pumps plus high and low alarms. The ON and OFF adjustments of each pump and alarm setpoint shall be full-range adjustable through use of an authorized operator access code and a keypad. The controller display shall show the operation of each control stage. Review of controller adjustments shall be possible by the operator without use of the access code.
6) Input signal conditioning shall provide keypad-selectable averaging of the input signals with one reading taken every second and from one to ninety-nine readings being selectable with the Controller displaying and providing control based on a moving average of the selected number of samples.
7) The digital controller shall include keypad adjustable on-delay timing logic to provide staggered pump starting following a power failure condition. The controller shall also provide keypad adjustable off delay timing for each pump control stage to provide smooth transition between control stages.
8) The digital controller shall be furnished with a multiple-ramp output capability implemented in hardware and software for the variable speed pumps/drives. The ramp shall be programmed to be re-configurable with the operation of each of the sixteen (16) control stages and the other independent ramp configurable with respect to the full-range conditioned signal of the controller without reference to control stage operations.
9) Each ramp output signal shall be selectable to be 1-5 VDC into 25K ohms or greater impedance or a 4-20 mADC into not less 600 ohms. Each ramp shall have the following five parameters configurable from the controller keyboard:
a) Whether it is a positive or negative-going ramp.
b) The level at which the maximum ramp signal is to be produced.
c) The level at which the minimum ramp signal is to be produced.
d) The percentage of full-scale ramp signal output desired at the selected high level.
e) The percentage of full-scale ramp signal output desired at the selected lower level.
10) Each control stage shall be capable of re-defining the ramp that is common to all (for purposes of load-sharing under differing conditions). The other ramp shall be independent of the first and configurable as described without reference to the operation of the control stages. In addition to keypad configurability of each ramp, they shall also be reviewable by the operator by use of a convenient keypad sequence.
11) In addition to the pump/drive control and abnormal level alarm setpoint capability, the controller shall provide alarm annunciation. The controller display shall show abnormal alarms, signal failure and system monitor/alarm outputs of a watchdog timer. Upon the occurrence of an alarm, an audible device shall operate and the controller display will flash with the alarm description, complete with the time and date of the alarm occurrence. An acknowledge pushbutton shall be provided to allow silencing of the audible device while the digital display will continue to show the alarm function, complete with time and date information, until the condition has cleared. The following alarms shall be provided for the pump station:
a) High Level alarm
b) Low Level alarm-
c) Transducer signal failure
d) Pump No. 1 VFD failure
e) Pump No. 2 VFD failure
f) Pump No. 3 VFD failure
g) Pump No. 1 Overtemperature/seal leak failure
h) Pump No. 2 Overtemperature/seal leak failure
i) Pump No. 3 Overtemperature/seal leak failure
12) The display shall operate in a manual scrolling menu mode with the various displays shown in sequence as selected by the keypad's up/down arrow keys. The display shall indicate the specific function entered on the keypad to confirm that selection of a particular output or other function from the keypad during adjustment or review routines. When operating a key of the controller the audible alarm shall chirp briefly to confirm that the selected key has operated.
13) The digital controller display/keypad shall be housed in a flush-mounted, environmentally protected assembly and mounted on the door of the control system.
14) The unit shall employ an operator interface having a 32-character alphanumeric backlit LCD display with character height not less than .3" and with a 16 position keypad operating in menu mode.
15) A watchdog function shall be provided in the controller which observes meaningful microprocessor activity. In the unlikely event of microprocessor stoppage the watchdog shall reset the processor. In addition, it shall transfer Form C contacts provided to job connection terminals.
16) An analog (level) simulation module shall be supplied to provide a normal/simulated signal to the controller. The simulated level signal shall be used to calibrate and test the control system.
17) The Controller shall have two (2) RS-232C serial communications ports. One serial port shall be available as a modem interface for future communications. The other serial port shall be available as an interface for a microcomputer or a serial alarm and event logging printer.
18) The pump controller shall accept a remote signal from each grinder controller indicating that the grinder has failed. In the event of this signal, the corresponding pump shall deactivate similar to a pump failure.
19) It is the specific intention of this specification that a standard Microprocessor-based pump controller be provided, with all of the control and communications features described as a fully-integrated assembly.
11. Speed Signal Isolator/transmitter:
1) A signal isolator/transmitter module shall be supplied to provide a means of interfacing the microprocessor-based controller and redundant control systems with the variable frequency drives. This module shall accept a 4-20 mA or 1-5 VDC input signal and provide an isolated, powered, 4-20 mADC output signal.
2) The module shall be capable of inverting the input signal, and provide an "in service" calibration function. A ramp feature shall provide a variable bandwidth output with a passband linear to the input signal. The module shall be suitable for panel mounting, and be powered by 12 VDC for optional battery backed operation.
3) The module shall include high and low limit inputs with potentiometers for adjustments. Upon activation of the high limit input from the redundant float control system, the 4-20 mADC output signal shall be limited to a preset value as set on the high speed potentiometer.
12. Redundant High Alarm/pump Control: An independent high level alarm and redundant control capability with features as described shall be provided in addition to the specified primary Level Responsive Controller/Submersible Level Transducer system. It shall be powered by a 120 VAC circuit other than the one powering the primary system.
A comprehensive redundant automatic control and alternation capability for the equally-sized pumps of this station shall be provided under this specification as hereinafter described.
It shall be furnished as a field- proven fully-integrated single-package standard product of the manufacturer and shall provide both first-on/first- off automatic and fixed manual sequences of pump operation of two or three pumps. In addition the Controller shall have the following features:
a) 8-Sensor switch circuit inputs (non-differential)
b) 6-Control relay or open-collector outputs
c) 2-Relays with SPDT contacts for high and low level alarm use
d) 3-SPST-NO load relays for automatic pump control
e) 1-Open-collector "monitor" output active under normal operating conditions
First-on/first-off automatic alternation is specified to minimize the starting frequency of each pump and to approximately-equalize usage. It shall assure that upon an increase in demand the pump with the longest rest since its previous operation will be the next one called into service. Conversely upon a decrease in demand the pump that has been running the longest is to be the first one shut down.
The selection of pump sequences shall be implemented by a front-panel switch and not require any tools or electrical re-connections. To facilitate the removal of any pump from service for maintenance and/or to allow station expansion the controller shall provide the following pump operating combinations both as fixed manual and auto FOFO sequences:
POSITION-1 AUTO 1-2
POSITION-2 AUTO 1-3
POSITION-3 AUTO 2-3
POSITION-4 AUTO 1-2-3
POSITION-5 FIXED 1-2-3
POSITION-6 FIXED 1-3-2
POSITION-7 FIXED 2-3-1
POSITION-8 FIXED 2-1-3
POSITION-9 FIXED 3-1-2
POSITION-10 FIXED 3-2-1
The Controller shall be configurable through the use of two internal DIP switches:
Switch No. 1 shall determine whether the high and low level alarms operate in a non-differential or latched mode. When switch 1 is in the off position, the high and low level alarms shall operate on/off directly from the operation of their respective control input. With switch 1 in the on position, both the high and low level alarms shall reset after actuation when the level reaches LS5.
Switch No. 2 shall determine whether the LS2, LS3 and LS4 sensors each require/accept a level sensor input or whether a single "common off level for all controlled pumps" is determined by connecting a level sensor to the LS2 input and the LS2, LS3 and LS4 LEDs and circuits operate simultaneously from the operation of this one level sensor.
With switch 2 in the off position, 3 independent level sensors shall be used. With switch 2 in the on position, a single "all pumps off" level sensor shall be connected and the 3 circuits operate in unison.
The controller shall have an input terminal which will advance the alternation sequence under auto FOFO operation.
The control shall operate on 120 VAC with a current draw of less than 12 VA or on 12 VDC power. All job connections shall be at screw/clamp plate type barriered terminals accessible from the front of the assembly and suitable for use with one or two AWG #12-22 wires. Input sensor circuits shall be powered by the controller with 12 VDC through a UL-recognized isolation transformer. The 120 VAC line input shall be protected against transients and fused. The controller shall qualify for UL508 panel use. It shall be compact in size with dimensions not exceeding 10" high, 3" wide by 4-1/2" deep.
The pump controller/alternator shall operate in a redundant control mode with direct acting float switch level switch level sensor inputs. The primary and redundant pump control output load relay contacts shall be wired to the motor starter/VFD pilot circuits. The abnormal level alarm outputs from the primary and redundant level control systems shall be unpowered contacts rated 10 amp @ 240 VAC wired to terminals.
13. Redundant High Alarm/pump Control Liquid Level Sensors: The level sensor shall have a molded polyethylene body, internal redundant polyurethane foam flotation, potted switch/cable connections and fine-stranded AWG #18 cable with heavy-duty synthetic rubber jacket in lengths as required to run unspliced to the control panel as shown on the drawings.
The CONTRACTOR shall furnish, install and wire the three float switches as shown on the drawings. The float switch shall be mounted to a 1" pipe utilizing all stainless steel float switch mounting hardware. The 1" pipe shall be attached to the wall of the well with two stainless steel pipe mounting clamps located near the top of the pipe.
2.2 AUTOMATIC DIALER
1. General: An automatic dialer shall be provided and installed in the electrical room. Automatic dialer shall be connected to the proposed telephone line.
2. Automatic Dialer: The dialer shall be a solid-state, microprocessor based system and shall communicate using electronically synthesized speech. Systems that use mechanical or magnetic tape loops shall not be considered. The dialer shall have an FCC approved telephone coupler. Transient protection on the telephone line and power input of the dialer shall be an integral part of the dialer.
3. Programming: The user shall be able to program the following on the dialer keypad: telephone numbers, delay or waiting period after acknowledgment of alarm and station I.D. (location). The dialer shall be able to accept four (4) alarm inputs (normally closed, dry contacts) and shall be able to dial up to four (4) different telephone numbers sequentially upon alarm condition occurring.
4. Power Supply: The dialer shall have a four (4) hour battery back-up allowing it to operate should AC power be lost. Standard power to the dialer shall be 120 VAC. Should AC power to the dialer be lost, the system shall dial its pre-programmed telephone numbers and speak the power outage condition.
5. Operation: Upon the occurrence of an alarm, the dialer shall dial a pre-programmed telephone number and communicate its location and alarm status. Acknowledgment of the receipt of the alarm shall be by DTMF tone signal, or a return telephone call into the dialer. If no acknowledgement occurs, the dialer shall continue to dial the four telephone numbers sequentially until acknowledgment occurs or the alarm condition ceases. Upon acknowledgment of the alarm, the dialer shall lapse into its pre-programmed (by the user) delay period and wait for corrective action to be taken. Should the delay period run out, and the alarm still exist, the dialer will resume dialing its telephone numbers. Also, should a new alarm occur during the delay period, the dialer
shall immediately abort the delay and begin dialing again. The automatic dialer shall be an Acurex ADAS IX Model #1144-101, RACO “Verbatim” or equal.
6. Alarm Conditions: The alarm conditions that are sent to the automatic dialer are as follows:
Power Outage
High Water Level Alarm in the Wetwell
Drywell Flood
Pump Failure
2.3 Additional Controls
1. Blower Controls: 24-Hour Timers shall be installed in the pump control panel to independently control the wetwell blowers. Timers shall operate at 120 VAC and shall have a 24 hour dial capable of intermittent programming at intervals of 15 minutes. Unit shall provide continuous ON operation when adjacent intervals are set in the ON position. Blowers shall be tied in with the pump controls, so that the blowers do not operate when any pump is operating.
2. Drywell Flood Alarm: A drywell float switch shall be furnished to automatically detect a high liquid level in the drywell. A liquid rise of 3/8” from the rest position shall operate the float switch, and shall reset when the liquid level drops 1/16”. The float switch junction box and mounting hardware shall meet NEMA 4X corrosion resistance requirements. Float switch shall require no adjustments or calibration and shall be reliable following long-term inactivity.
3. External Horn/Alarm Light: An audio/video alarm systems shall be installed at the pump station and shall have a light, a horn, and a horn silence switch as specified. The alarm shall be activated by a high level alarm in the wetwell. Alarm light and horn shall be mounted on the exterior of the building, as shown on the plans.
a) Alarm Light: Provide and install a vapor-proof 12-volts DC flashing light with a 100-watt lamp, red globe and guard.
b) Alarm Horn: Provide and install a 12 Volts DC vibratone type horn mounted on a weather-tight box which will be mounted as stated above. A silencing switch shall be provided and installed to turn off the horn.
c) Horn Silence Switch: Provide and install a pushbutton with control relay which, when pushed, will silence the alarm and automatically reset the alarm circuit to the ready condition after the fault is cleared. The pushbutton shall be installed in the station control panel
PART 3 EXECUTION
3.1 INSTALLATION
1. General: Equipment specified in this section shall be installed in accordance with the manufacturer’s recommendations at the locations as shown on the plans.
2. Field Service: The manufacturer shall provide the services of a factory trained service technician for a minimum of four(4) eight(8) hour days of field service to inspect the installed equipment, supervise start-up of the equipment and train the Owner’s personnel in the proper maintenance and operation of the equipment.
END OF SECTION