INSTALLATION AND OPERATION MANUAL ISM-4081 INTEGRATED SHUTDOWN MODULE

Transcription

1 INSTALLATION AND OPERATION MANUAL ISM-4081 INTEGRATED SHUTDOWN MODULE SYSTEM CONCEPT When not transferring fuel, the pressure in the underground piping system for gasoline distribution may fall due to thermal contraction of the fuel within the line. This condition may create problems during dispensing operations. The ensures line pressure by periodically starting the submersible pump (turbine) to repressurize the line. The ISM-4081 includes the following features: Automatic fuel line repressurization Line leak monitoring Sequence turbine control for manifold applications Pressure failure alarm detection Sump sensor monitoring (optional) Sump sensor alarm detection Full shutdown of pump activity when pressure alarm condition is detected Optional full shutdown of pump activity when sump alarm condition is detected Pump contactor control in response to an authorization signal Ability to disable the repressure cycle based on time-of-day to allow tank testing Ability to disable the repressure cycle based on an AC input signal Ability to disable the repressure cycle based on a DC input signal BASIC SYSTEM CHARACTERISTICS The microcomputer based ISM controls the sequencing of two timers. The first determines the pump running time. The second determines the delay time following the detection of low line pressure. The following statements outline the basic operation of the ISM The four push-button switches located on the ISM s front panel are used to program the time-of-day, the pump duration time, the delay time, the disable interval, and the shutdown response. Information regarding these functions is presented later in this manual. 2. A two-line by 16-charcter display is located on the ISM s front panel. Programming and system status information is presented on this display. Information regarding these messages is presented later in this manual. 3. The timers operate synchronously with respect to a dispensing authorization signal. This means that the repressure sequence will be interrupted by the initiation of a fuel dispensing request. When the authorization signal is turned off, the repressure cycle is reinitiated in the monitoring state. 4. Authorization signals will be ignored and pump operation will be terminated if a pressure alarm is detected. Full shutdown may also be enabled for sump alarm detection. Pump control will be restored when the alarm condition is corrected and the RESET push-button is cycled. 5. Operation of the pump may be disabled during periods of tank integrity testing. An active dispensing process will not be interrupted by the disable signal. 6. The monitoring of a mechanical leak detector provided by is required for operation of the ISM. The monitoring of a sump sensor is optional. 7. With power applied, the ISM is active. The pump timer is the first to operate following the application of power. The pump will remain active until proper line pressure is achieved. Following the completion of the repressure cycle, the ISM enters the monitoring state looking for loss of line pressure. 8. While the ISM-4080 can operate in a stand alone mode, it also can be connected in a serial mode to enable sequenced operation of staged turbines. This is particularly useful where the outputs of several turbines are fed into a common distribution manifold. After receiving an authorization signal and completing a leak test, the contacts of the READY relay are used to signal the next controller in the sequence. Installation and Operation Manual Rev

2 CONTROLLER LABELING The following information is provided on the ISM s label. The installer should be familiar with this information. Controller name, model and serial number Voltage, current and load specifications Notice of application information Manufacture s name and telephone number ENCLOSURE AND MOUNTING The ISM is packaged in a standard DIN-rail mountable enclosure. It is designed for operation in a non-hazardous environment such as an equipment room. It is recommended that the module be located in the vicinity of the pump contactor with which it is associated. A section of DIN-rail mounting strip is provided with the ISM. Secure this strip to a panel board using screws whose head does not project above the mounting surface of the rail. Following the secure mounting of the rail, snap the module onto the rail. ELECTRICAL CONNECTIONS Figure 1 illustrates the power connections for a 115 Vac mains circuit. Figure 2 illustrates the power connection for a 230 Vac mains circuits. AUTHORIZATION SIGNAL INPUT The operation of the submersible pump is under the control of the ISM This means that pump operation due to both the repressure cycle and authorization requests is controlled by the ISM. In retrofit situations, the authorization signal needs to be relocated from the contactor to the control module. Figure 3 illustrates a typical installation prior to incorporation of the module. Figure 4 illustrates a typical configuration for the authorization signal following the incorporation of the ISM. If the ISM-4081 is used in a stage sequence configuration, Figure 4 illustrates the wiring for the authorization signal to the first controller in the sequence. Figure Vac Mains Connection Figure 3 Typical Original Installation Figure Vac Mains Connection Figure 4 Authorize Circuit with ISM Installation and Operation Manual Rev

3 CONTACTOR OUTPUT The operation of the submersible pump is under the control of the ISM This means that pump operation due to both the repressure cycle and authorization requests is controlled from the ISM. In retrofit situations, the system wiring must be changed so that the contactor is driven by the module. Figure 3 illustrates a typical installation prior to incorporation of the ISM. Figure 5 illustrates a typical configuration for the contactor output following the incorporation of the ISM. When pump operation is interrupted or prevented due to alarm detection, normal operation of the pump may be restored by correcting the alarm condition followed by operation of the RESET push-button. Two connection configurations are available. Figure 6 illustrates the connection of the required leak detector piston monitor switch. Figure 7 illustrates the connection of the piston switch and the optional normally closed sump sensor. Note that the voltage and currents supplied from the ISM to these remote switches is intrinsically safe. While the controller is packaged for a nonhazardous environment, the monitoring switches may be located in a hazardous environment. Care should be taken to comply with local regulations regarding the transition of the barrier between non-hazardous and hazardous locations. Note that the sump sensor switch is closed when not activated, and open circuit when activated. The piston switch is a closed when the leak detector is fully open, and otherwise measures 10,000 ohms. Figure 5 Contactor Circuit with Module PRESSURE SWITCH AND SUMP SENSOR The ISM-4081 monitors the performance of the LD-2000 or LD-3000 mechanical leak detectors provided by. If adequate line pressure is not developed either during the repressure cycle or a dispensing operation, the pump operation is terminated and a pressure alarm is indicated To provide this capability, a proprietary switch assembly, which is provided with the control module, is screwed into the top of the leak detector. The connection of this feature is required for operation of the system. The ISM-4081 also features the ability to monitor a sump liquid level sensor. When the sump sensor is activated, pump operation may be terminated. In all cases a sump alarm is indicated. The connection of this feature is optional. Figure 6 Piston Switch Only Circuit Figure 7 Piston and Sump Switch Circuit Installation and Operation Manual Rev

4 ALARM OUTPUTS Two types of alarm conditions can be detected by the ISM; a low pressure alarm and a sump sensor alarm. A low pressure alarm can be detected in either a repressure or dispensing operation. In either case, if the piston monitor switch does not detect an open leak detector a pressure alarm is initiated. This condition signals that the line pressure did not build to a level exceeding the 3 gph leak detection threshold. When a low pressure condition is detected, the pump is shut off, an alarm message is presented on the display, and the alarm relay is energized. Refer to Figure 8 for an illustration of an annunciator connection. A sump sensor alarm can be generated at any time and is asynchronous to any other operation. If the sump sensor s switch opens, a sump alarm is initiated. When a sump alarm condition is detected, the pump is shut off, an alarm message is presented on the display, and the alarm relay is energized. Refer to Figure 8 for an illustration of an annunciator connection. Note that when the ISM is used in conjunction with a Tank Monitoring System such as the Veeder-Root TLS-350, both the piston switch and the sump sensor can be monitored by the ISM. This configuration allows the alarm relay contacts, terminals 15 and 16, to be connected to the Tank Monitoring System s sensor input and act as a general alarm signal. If contact configuration or intrinsic safety issues arise, an interposing relay may be added which is driven by the ISM s alarm output. Contact VMI if further installation assistance is required. STAGED TURBINE AUTHORIZATION Figure 8 illustrates the connection of the READY relay to generate the authorization signal for the next controller in a series of sequenced turbines. PROCESS DISABLE INPUTS In the event that low line pressure is detected, the ISM will start the pump to repressurize the distribution line. This event will agitate the fuel in the storage tank. This is undesirable when trying to perform tank integrity testing. The ISM-4080 has several methods by which its activity may be temporarily disabled. The first of these is provided strictly through the application software which is monitoring the time-of-day clock. This method is described later in this document. The remaining two methods initiate the disable function by means of an external signal. These signals may be generated by a toggle switch or by a contact closure in a tank monitoring system. Pump control will be restored when the disable signal is removed. Refer to Figures 9 and 10 for illustrations of the disable signal connections. Do not connect both types of signals to a single module. Doing so will certainly result in damage to the connected equipment. Note that dispensing operations will not be prevented by a disable signal, and an active dispensing operation will be allowed to finish before the disable request is processed. Normal operation will be reestablished following the removal of the disable signal. Figure 8 Alarm Annunciator Connection and Sequenced Authorzation Figure 9 Vac Disable Connection Installation and Operation Manual Rev

5 SPECIFICATION Figure 10 Vdc Disable Connection AUTHORIZATION BYPASS SWITCH Referring to the module when mounted vertically, the authorization signal bypass switch is located at the top left. When this slide switch is in the NORMAL position the unit operates as described. When the switch is in the BYPASS position the authorization input is shunted directly to terminal 18 and the unit will not respond to dispensing requests. This feature is particularly useful in sequenced turbine configurations. EMERGENCY SHUT-OFF When installing new equipment, it is important to maintain the integrity of the site s emergency shut-off system. It is the responsibility of the installer to develop an installation configuration which provides for proper emergency shut-off function. The following comments are provided to assist this process. If the shut-off system breaks mains power to the pump contactor, voltage will be removed from the pump when the shut-off system is activated. This configuration will not be affected by installation of the ISM. If the shut-off system breaks mains power to the ISM module, the drive signal to the coil of the pump contactor will be removed when the shut-off system is activated. This configuration is adequate if it meets local codes. If the shut-off only disables the authorization signal originating from the point-of-sale (POS) equipment or the dispenser, voltage will not be removed from either the pump or the ISM. In this case the repressure cycle will not be disabled and could result in unexpected pump operation. This would not meet the requirements for a shut-off system. Input Voltage Authorize Input Voltage Range Typical Authorize Input Voltage/Current Disable Input Voltage Range AC type DC type Typical Disable AC Input Typical Disable DC Input Output Relay Rating Sensor Input Piston Switch (Supplied by VMI) Sump Sensor Switch Selectable Delay Timer Values (min) Selectable Duration Timer Values (min) 115 Vac, 40 ma, 1 ph 230 Vac, 20 ma, 1 ph Vac 115 Vac at 10 ma Vac 5 24 Vdc 115 Vac at 10 ma 24 Vdc at 1 ma 8A, 125/250 Vac 5A, 30Vdc Intrinsically safe voltage and current supplied from internal circuitry. Switch contact is open when line pressure is low, that is, when the leak detector is closed. Switch contact is closed when sensor is not activated Installation and Operation Manual Rev

6 MEASURING SYSTEM BLEED-BACK When under pressure all closed piping systems exhibit an elastic response that will force fuel from the line if an opening is provided. The volume of fuel forced from the line is dependent on a number of factors and must be measured for each installation. The selection of a delay time from Table 1 is dependent upon this volume. The following statements outline a procedure for measuring the expelled volume which is referred to as bleed-back. This procedure assumes the use of the Vaporless Model LDT-890 Leak Detector Tester to perform this task. The following procedure assumes no knowledge of the operation of the LDT-890 and therefore details each step of the process. The operation manual supplied with the LDT-890 provides additional information and should be consulted by the technician. The following procedure measures the bleedback for a single product. If the site contains multiple products, this procedure must be repeated for each product. 1. Disable ISM Repressure Cycle With power applied to the ISM, cycle the DUR (duration) push-button located in the upper left corner of its front panel until the duration value reads 00 seconds. This will prevent the ISM from initiating a repressure cycle. 2. Power Off Turn off the circuit breaker providing power to the product under test. This is done to prevent the accidental starting of the pump while the line is open in the following steps. Power may remain on the ISM, however, it is acceptable if power is also disconnected from the module. 3. Install LDT-890 Test Unit Select the dispenser at the highest point of the delivery system for the selected product. If there is no elevation difference, select the dispenser farthest from the pump. Caution: Eye protection required during the calibration process. 4. Carefully remove the plug from the test port on the impact valve. Caution: There may be pressure in the line. 5. Install the 18 whip hose supplied with the test unit. The application of thread sealing compound is recommended. 6. Connect the quick disconnect coupler on the hose from the test unit to the whip hose. 7. Set the test unit selector to the PRESSURE STEP TEST position. 8. Power On Turn on the circuit breaker for the product under test. If power had been disconnected from the ISM, restore power to the module. 9. System Purge Authorize the dispenser. The pump should start running. On the right-hand pressure gauge of the LDT-890, watch for the pump to achieve operating pressure. 10. Check all connections for leaks. Correct any fault conditions. 11. With the large beaker (1000 ml) under the LDT-890 discharge port, set the selector to the DISPENSER NOZZLE position. Purge the tester of air by allowing 800 to 1000 ml of fuel to flow into the beaker. After purging the LDT-890, set the selector to the PRESSURE STEP TEST position. 12. Purge the dispenser line by running several gallons of fuel into an approved safety container. 13. Bleed-Back Measurement Remove the dispenser authorization. The pump should stop running. Unless there are fault conditions such as a leak or significant thermal contraction, the line pressure should stabilize at PSI for fractional horsepower pumps, or PSI for highcapacity or high-pressure pumps. 14. With the large beaker under the LDT-890 s discharge port, carefully move the selector counterclockwise until fuel begins to flow. Monitor the line pressure and when it falls to 14 PSI rapidly return the selector to the PRESSURE STEP TEST position. 15. With the flow of fuel stopped, empty the collection beaker. 16. With the large beaker under the LDT-890 discharge port, carefully move the selector to the DISPENSER NOZZLE position. Fuel will Installation and Operation Manual Rev

7 begin to flow into the beaker. When fuel stops flowing, return the selector to the PRESSURE STEP TEST position. 17. Note the volume of fuel collected. This volume is referred to as bleed-back. Repeat the collection process several times to confirm the bleed-back volume. Depending on the measured volume, the use of the small (150 ml) beaker may provide more accurate measurements. The averaging of several consecutive samples is necessary to accurately determine the bleed-back volume. 18. Delay Timer Programming Refer to Table 1. Select the volume in the left-hand column which first exceeds the measured bleed-back. The time value in the right-hand column indicates the desired delay following the detection of low pressure. 19. The Time Delays shown in Table 1 are the minimum values needed to allow the leak detector to reset to its leak sense position. Longer delay times are acceptable; however, these longer delay times may increase the frequency of false alarms due to thermal contraction. 20. Cycle the DLY (delay) push-button located in the lower left corner of the module s front panel until the delay value reads the desired number of minutes. 21. Duration Timer Programming Cycle the DUR (duration) push-button located in the upper left corner of the module s front panel until the desired duration value in minutes appears in the display. This will set the maximum repressure duration time to the indicated value. Under normal conditions the 01 minute setting should be selected. If the line exhibits excessive bleed-back or extreme thermal contraction, then a larger setting may be selected. 22. Perform Leak Detector 3 GPH Test This completes the bleed-back measurement procedure and set-up of the ISM repressure cycle. It is recommended that a 3 GPH leak test should be performed. LEAK DETECTOR TEST AT 3 GPH Whether the ISM is fitted to a new installation or retrofit to an existing site, a test of the leak detector should be performed. This is done to insure that the VMI Leak Detector is operating normally and that the selected ISM delay time is long enough for the VMI Leak Detector to return to its reset position. The following statements outline a procedure for testing the operation of the VMI Leak Detector. This procedure assumes the use of the Vaporless Model LDT-890 Leak Detector Tester to perform this task. The following procedure assumes no knowledge of the operation of the LDT-890 and therefore details each step of the process. The operation manual supplied with the LDT-890 provides additional information and should be consulted by the technician. 1. Install LDT-890 Test Unit If the LDT-890 has not been installed, follow steps 1 through 12 in the procedure outlined under Measuring System Bleed-Back. This procedure should result in the dispenser being authorized, the pump running, and the repressure cycle disabled by setting the repressure time to 00 seconds. 2. Leak Calibration With the large beaker (1000 ml) under the LDT-890 discharge port, set the selector to the CALIBRATE GPH position. Fuel will begin to flow into the beaker. 3. The object of the next step is to calibrate the fuel flow from the test unit to the rate of 3 gallons per hour at 10 psi pressure at the discharge. This specification meets the requirements of the EPA regarding leak rate testing. 4. The procedure is simply stated at follows: Adjust the fuel flow using the left-hand knob labeled CALIBRATE ORIFICE. Adjust the pressure on the left-hand pressure gauge to 10 psi using the right-hand knob labeled CALIBRATE PRESSURE. Turn the ORIFICE knob counterclockwise to increase flow and clockwise to decrease flow. Turn the PRESSURE knob counterclockwise to reduce pressure and clockwise to increase pressure. Installation and Operation Manual Rev

8 First adjust the flow using the ORIFICE knob and then adjust the gauge pressure using the PRESSURE knob. It is important to perform the procedure in this order. 5. Using the small beaker (150 ml) collect a sample of fuel over a 30 second interval. The flow is properly adjusted when 95 ml are collected in 30 seconds. This volume is equivalent to a rate of 3 gallons per hour at 10 PSI. Repeat the procedure outlined in step 4 until the correct volume of fuel is collected in the specified time. 6. Set the selector to the PRESSURE STEP TEST position and remove the dispenser authorization. 7. Reduce Line Pressure to Zero With the large beaker under the LDT-890 discharge port, set the selector to the DISPENSER NOZZLE position. Fuel will begin to flow into the beaker. After the reading on the right-hand pressure gauge falls to zero, set the selector to the PRESSURE STEP TEST position. 8. Read Operating Pressure Authorize the dispenser. The pump will start running. Watch for the pump to achieve operating pressure as seen on the right-hand pressure gauge. Note this pressure reading and then remove the authorization from the dispenser. 9. Reduce Line Pressure to Zero With the large beaker under the discharge port, set the test unit s selector to the DISPENSER NOZZLE position. Fuel will begin to flow into the beaker. After the reading on the right hand pressure gauge falls to zero, set the test unit s selector to the GPH TEST position and authorize the dispenser GPH Leak Test With the dispenser authorized, the pump will start running. With the selector in the GPH TEST position a 3 gph leak has been introduced to the system. On the right-hand pressure gauge watch for the pump to build pressure. If the mechanical leak detector is properly calibrated this pressure should not reach the normal operating pressure previously observed. Note this lower pressure value. Remove the authorization from the dispenser. 11. Reduce Line Pressure to Zero Set the test unit s selector to the DISPENSER NOZZLE position. Fuel will continue to flow into the beaker. After the reading on the right-hand pressure gauge falls to zero, set the selector to the GPH TEST position and again authorize the dispenser. 12. Leak Test Confirmation With the dispenser authorized, the pump will start running. Again, note that with the selector in the GPH TEST position a 3 gph leak has been introduced to the system. Watch the right-hand pressure gauge as the pump builds pressure. The pressure should build to the value noted in Step 10. TECHNICAL NOTE If the pressure indicated on the right-hand pressure gauge does not stabilize at the lower pressure, but rather steps through to the higher normal operating value, the leak detector has failed the leak test. Contact the factory for calibration information. Turn the selector to the PRESSURE STEP TEST position. Following a short delay the pressure should step up to the value noted in Step 8. This is the indication that the mechanical leak detector has properly transferred from its leak test position to its full flow position. 13. Auto-Repressure Test Remove the dispenser authorization. With the large beaker under the discharge port, set the selector to the DISPENSER NOZZLE position. Fuel will flow into the beaker. After the reading on the right-hand pressure gauge falls to zero, set the selector to the PRESSURE STEP TEST position. 14. Using the ISM s DUR (duration) pushbutton, set the duration time to 30 seconds. Cycle the ISM s RST (reset) push-button to initialize the repressure cycle. The pump will start running. Immediately return to the dispenser. On the right-hand pressure gauge of the LDT-890, verify that normal operating has been achieved. Set the selector on the LDT-890 to the GPH TEST position. This will introduce a 3 GPH leak to the system. Because the leak detector has already stepped through to its fully open position, Installation and Operation Manual Rev

9 nothing will change. This leak must be introduced to the system before the 30 second duration timer has completed its cycle. 15. At the end of the pump timing cycle, the ISM will automatically turn off the pump. On the right-hand pressure gauge of the LDT-890, verify that the pressure falls due to the 3 GPH leak. If the proper delay timer has been selected from Table 1, the pressure should fall to zero before the next automatic pump cycle is started. 16. At the end of the delay timing cycle, the ISM will automatically turn on the pump. Pressure will begin to build, but will stop at the value observed in Step 10 indicating that the leak detector has found the 3 GPH leak. This successfully completes the ISM test. 17. Disconnect LDT-890 Test Unit Turn off the pump s power breaker. Turn off power to the ISM or set the duration timer to 00 seconds to disable the repressure cycle. 18. With the large beaker under the LDT-890 discharge port, set the selector to the DISPENSER NOZZLE position and bleed off fuel until the reading on the right-hand pressure gauge is zero. 19. Disconnect the quick disconnect coupler attaching the test unit to the whip hose. 20. Remove the whip hose from the test port and install the original plug. The application of thread sealing compound to the plug is recommended. 21. Full System Operation Turn on the power breaker. If required, restore power to the ISM and reset the duration timer to the desired value and the cycle the reset push-button. This completes the test procedure. The system including the ISM Integrated Shutdown Module is now fully functional. AVAILABLE TIMER SELECTIONS Table 1 Table 2 Delay Timer Selections Bleed- Back (ml) Delay Time (minutes) > Duration Timer Selections Duration Time (minutes) * * Disables repressure cycle Installation and Operation Manual Rev

10 SYSTEM OPERATION Introduction In the following sub-sections a detailed description of the operation of the ISM is presented. TECHNICAL NOTE When multiple ISMs are used in a staged turbine application, set-up all units with the same values. Display A two-line by 16-character alphanumeric display is located in the center of the ISM s front panel. This display is used to present operating status and system programming information. In normal operation, the first line presents the name of the active operating state, while the second line presents system status information. Other display modes will be defined later in this section Push-Buttons Four push-button switches are located on the front panel, one in each corner of the panel. These are used for programming the repressure cycle characteristics, the time-of-day clock, the disable function, and to reset the module to a known state of operation. The function of these switches will be defined later in this section. Power-On Message When power is initially applied to the module, a welcome message will appear in the display. This message, shown below, indicates the module type and model number. Shut-down Module Model 4081 v07 Normal System Status Display The normal system status display has the following form: Status = REPRESS OK OK OK Operating States Table 3 presents brief definitions for the various system operating states. Table 3 States of Operation State Name Definition REPRESS Pump running to repressure distribution line. MONITOR Monitoring line for loss of pressure. DELAY Waiting for next repressure cycle. AUTHRIZ Authorization signal active, pump running to delivery fuel. DISABLE Repressure cycle and fuel delivery disabled. PRESALM Pressure fail alarm detected, system disabled. SUMPALM Sump level sensor alarm detected, system disabled. Setting the Duration Timer The duration timer determines the length of time that the pump runs during the repressure state. With any normal system status message in the display, cycling the DUR (duration) push-button will cause the timer value to advance to the next available selection. Refer to Table 2 for a listing of the available times. It is recommended that the RST (reset) push-button be cycled following this selection to synchronize the repressure process. The illustration below shows the duration value in bold type. In this example, the duration time has been set to 1 minute. Status = REPRESS OK OK OK TECHNICAL NOTE A duration time of 00 seconds disables the repressure function. All other functions operate in normal manner. Installation and Operation Manual Rev

11 Setting the Delay Timer The delay timer determines the elapsed time between the detection of low line pressure and the beginning of the repressure cycles. With any normal system status message in the display, cycling the DLY (delay) push-button will cause the timer value to advance to the next available selection. Refer to Table 1 for a listing of the available times. It is recommended that the RST (reset) push-button be cycled following this selection to synchronize the repressure process. The illustration below shows the delay value in bold type. In this example, the delay time has been set to 5 minutes. Status = REPRESS OK OK OK Setting the Time-of-Day Clock The ISM tracks the time-of-day for use by the internally activated disable function. To set the time-of-day clock: 1. Cycle the TIM (time) push-button to initiate the entry process. The illustration below shows an example of the message which is placed in the display. Time of Day 17:26 Programming the Internal Disable Function The normal operation of the ISM s repressure cycle can be disabled by either an external Vac or Vdc signal, or by a software function. The connection and operation of the external signal method has previously been defined. The internal software disable function uses the time-of-day clock to regularly disable the repressure cycle. For example, the repressure cycle can be disabled every day between 2 a.m. and 4 a.m. by performing the following programming operations. 1. Cycle the TIM (time) push-button to initiate the entry process. The illustration below shows an example of the message which is placed in the display. Time of Day 17:26 2. If the time-of-day clock requires adjustment, refer to the previous sub-section. 3. Cycle the TIM (time) push-button to advance the sequence to the disable function display. The illustration below shows an example of the message which is placed in the display. Sys Disable Time Off=00 On=00 2. Cycle the DUR push-button to increment the hour-of-day. The clock operates in 24-hour mode. The hour indicator advances in only one direction. If the desired selection is bypassed, simply cycle the DUR push-button until the desired selection reappears. 3. Cycle the DLY button to increment the minute-of-day. The minute indicator advances in only one direction. If the desired selection is bypassed, simply cycle the DLY push-button until the desired selection reappears. 4. With the desired time-of-day in the display, cycle the TIM push-button to advance the programming sequence to the Disable Time Function. (Refer to next sub-section.) 5. Cycle the TIM push-button twice to return to the normal display. This message indicates that the system will be disabled at 12 midnight and re-enabled at 12 midnight. In other words, the disable function is disabled. 4. Cycle the DUR push-button to increment the off-time selection. The clock operates in 24- hour mode. The hour indicator advances in only one direction. If the desired selection is bypassed, simply cycle the DUR push-button until the desired selection reappears. The illustration below shows the off-time value in bold type In this example, the off-time has been set to 2 a.m. Sys Disable Time Off=02 On=00 Installation and Operation Manual Rev

12 5. Cycle the DLY push-button to increment the on-time selection. The clock operates in 24- hour mode. The hour indicator advances in only one direction. If the desired selection is bypassed, simply cycle the DLY push-button until the desired selection reappears. The illustration below shows the on-time value in bold type. In this example, the off-time has been set to 4 a.m. Sys Disable Time Off=02 On=04 6. In the previous example, the ISM s disable function has been programmed to prevent repressure cycling every day between the hours of 2 a.m. and 4 a.m. 7. With the desired time values in the display, cycle the TIM push-button to advance the sequence to the Sump Alarm Response Function. (Refer to next sub-section.) 8. Cycle the TIM push-button again to return to the normal display. 9. When the ISM is disabled, by either an external signal or internal activation, the display presents an indicator as illustrated below in bold type. Status = DISABLE OK OK XX 10. Note that the repressure and alarm detection functions are disabled during the disable interval. Alarm sensing will immediately be restored at the end of the disable interval. 11. Note that fuel dispensing operations may be initiated during the disable interval. It is the responsibility of the station operator to ensure the lockout of authorization signals to allow for tank integrity testing. Sump Alarm Response Function The ISM-4081 provides for selection between two responses to detection of a sump alarm either full shutdown of all pump operations or alarm notification only. To select the mode: 1. Cycle the TIM (time) push-button to initiate the entry process. The illustration below shows an example of the message which is placed in the display. Time of Day 17:26 2. Cycle the TIM (time) push-button to advance the sequence to the disable function display. The illustration below shows an example of the message which is placed in the display. Sys Disable Time Off=00 On=00 3. Cycle the TIM (time) push-button to advance the sequence to the sump alarm response selection display. The illustration below shows an example of the message which is placed in the display. Smp Alm Shutdown Yes 4. Cycle the DLY push-button to disable the full shutdown mode and provide alarm notification only. Smp Alm Shutdown No 5. Cycle the DUR push-button to enable the full shutdown mode and provide for system shutdown and alarm notification. Smp Alm Shutdown Yes 6. With the desired response in the display, complete the programming process by cycling the TIM push-button. The display will present a normal system status message. Installation and Operation Manual Rev

13 Pressure Alarm Detection A pressure alarm can be detected in either a repressure cycle or a dispensing operation. During dispensing a pressure alarm is initiated if the piston switch does not detect a fully open leak detector within 15 seconds of the beginning of a cycle. During a repressure cycle a pressure alarm is initiated if full line pressure is not detected by the end of the cycle. This alarm condition signals that the line pressure did not build to a level exceeding the 3 gph leak detection threshold of the leak detector. When a pressure alarm condition is detected, the pump is shut off, an alarm message is presented on the display, and the alarm relay is energized. The illustration below shows the alarm indicator in bold type. Status = PRESALM AL OK OK Sump Alarm Detection A sump sensor alarm can be generated at any time and is asynchronous to any other operation. If the sump sensor s switch opens, a sump alarm is initiated. This alarm condition signals that the sump sensor has detected an inappropriate accumulation of water or fuel in the turbine containment sump. When a sump alarm condition is detected, the pump is shut off if the full shutdown mode has been selected (refer to Sump Alarm Response sub-section), an alarm message is presented on the display, and the alarm relay is energized. The illustration below shows the alarm indicator in bold type. Status = SUMPALM OK AL OK The pressure alarm indication can be cleared by cycling the RST (reset) push-button. The sequence will be forced to the repressure state. An authorization request will override the repressure cycle. In either event, the pump will be started and the dispensing cycle will be initiated. If the cause of the alarm has not been resolved, the alarm will reoccur until the cause of the alarm is corrected. The sump alarm indication can be cleared by cycling the RST (reset) push-button. However, if the cause of the alarm has not been resolved, the alarm will immediately be reasserted. This condition will remain until the cause of the alarm is corrected. Installation and Operation Manual Rev

14 Installation and Operation Manual Rev