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This alarm indicates a Low Pressure condition was detected
while dispensing. The low pressure threshold is programmable
from 0 - 25 psi (a low pressure threshold of 0 disables the low
pressure monitor).

Probable causes:

1.

Large line leak (inspect visible areas of piping, dispensers,
and STP)

2.

Tank is empty.

3.

Low or no STP pressure (bad STP, starting capacitor).

4.

Failed STP contactor relay.

5.

Power to the STP is switched Off.

LOW PRESSURE ALARM

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Содержание PLLD

Страница 1: ...Manual 577013 727 Revision B PLLD WPLLD Alarm Quick Help ...

Страница 2: ... or use of this publication Veeder Root reserves the right to change system options or features or the information contained in this publication This publication contains proprietary information which is protected by copyright All rights reserved No part of this publication may be photocopied reproduced or translated to another language without the prior written consent of Veeder Root For complete...

Страница 3: ...WPLLD only Page 6 Continuous Pump On Warning Alarm Pre 19 Continuous Handle Alarm Ver 19 and Higher Page 8 Fuel Out Alarm Page 9 Low Pressure Alarm Page 10 Open Alarm PLLD Only Page 11 Short Alarm PLLD Only Pre 19 Only Page 12 Periodic or Annual Test Warning Pre 19 Periodic or Annual Test Needed Warning Ver 19 Higher Page 13 Setup Data Warning Page 14 APPENDIX A TABLES Page 15 APPENDIX B THEORY OF...

Страница 4: ...bled and the relief venturi into the siphon pipe must be free from blockage IMPORTANT When measuring the pressure in the line for comparison with pressure transducer readings always install the pressure gauge DOWNSTREAM of the Check Valve such as at the emergency shut off valve DO NOT measure pressure at the STP INTRODUCTION WARNING This system operates near highly combustible fuel storage tanks F...

Страница 5: ...Jacket STP replace with the correct seal for your application 9 Dispenser is leaking External leaks connections filters etc or internal leaks solenoid valves in dispensers leaking into nozzle hose blender valve leaking etc 10 Air in the line Pre 19 11 Low or no STP pressure bad STP starting capacitor 12 Incorrect wiring of pump control transducer PLLD ONLY 13 No STP request signal from dispenser V...

Страница 6: ...ueezing each nozzle with STP On and dispenser switched Off c If dispensers are blenders check for blend valve leakage by looking for meter movement no dispensing and STP On d After making any necessary repairs to correct problems identified in steps a c retest line to confirm failure If it passes but no repairs were made the problem is intermit tent The most common intermittent causes are items 2 ...

Страница 7: ...witched On by another device not detected by the console e g Healy vapor recovery PLLD only 9 Bad PLLD Interface Module PLLD only 10 Cross wired transducers PLLD only 11 Transducer incorrectly wired to wrong side of STP capacitor WPLLD only Troubleshooting Guidelines Switch On the STP for 10 seconds to pressurize the line Shut the STP Off wait 5 seconds and measure the line side pump off pressure ...

Страница 8: ...below 2 Vent the product line to drop the line pressure to zero 3 Reconnect the product line 4 Restore STP power 5 In the PLLD WPLLD diagnostic menu run the pressure mea surement offset test WARNING WPLLD turns On the pump to make a pres sure measurement Make sure the line is reconnected before running the test 6 If the test result is greater than 5 psi check the transducer wir ing If the wiring i...

Страница 9: ...tly stuck On 3 Controller Module has blown fuse 4 Controller Module faulty 5 AC Interface Module faulty 6 Bad connection from the 220 Vac line to the AC Interface Module 7 Comm Module faulty 8 Bad connection between the AC Interface Module and Comm Module 9 WPLLD transducer faulty 10 Field wiring to STP faulty 11 STPs using different legs of 3 phase power Noise Interference 1 External device gener...

Страница 10: ... by Advanced Controls Technologies telephone 800 886 2281 Determining if the problem is transmission related Manually start a test on the line that has the Comm alarm The STP will be switched on for 10 seconds to pressurize the line Watch the lights on the AC Interface Module for a short burst of data 8 seconds after the pump switches On If no lights are lit the transmission is not being received ...

Страница 11: ...ll dis penser switches are Off 2 Excessive dispenser leakage voltage measure pump in voltage with all dispensers switched Off a reading 30 Vac indicates excessive leakage Install an isolation relay between the dispenser and the PLLD Controller Module reference Manual 577013 344 3 Dispenser internal board is faulty or possibly a bad dis penser switch switched Off but it is still On Continuous Pump ...

Страница 12: ...w 10 inches and a gross line test has failed The alarm will clear when the fuel level exceeds 10 inches NOTE The fuel level does not include the programmable tilt value and may therefore be different from the height reading dis played FUEL OUT ALARM ...

Страница 13: ...able from 0 25 psi a low pressure threshold of 0 disables the low pressure monitor Probable causes 1 Large line leak inspect visible areas of piping dispensers and STP 2 Tank is empty 3 Low or no STP pressure bad STP starting capacitor 4 Failed STP contactor relay 5 Power to the STP is switched Off LOW PRESSURE ALARM ...

Страница 14: ... PLLD Interface Module the pressure reading is negative Note Diag nostic screen will display 0 when pressures are negative Probable Causes 1 Open condition in the field wiring 2 Incorrect field wiring 3 Reversed wiring on transducer 4 Bad transducer 5 Bad PLLD Interface Module ...

Страница 15: ... On and pump Off pressures are reading the same value and are within the range of 5 to 15 psi Probable causes 1 STP did not switch On 2 Low STP pump pressure 3 Bad transducer 4 Bad PLLD Interface Module SHORT ALARM PLLD ONLY Pre 19 Only ...

Страница 16: ... 4 to correct the High Pressure condition Ver 19 and higher The line is not venting when the pump is shut Off There should be at least a 2 psi difference between Pon and Poff Print out the 0 2 or 0 1 diagnostic The No Vent test aborts message X out of 10 tests indicates how many tests have been aborted due to a non venting problem Check for stuck relay Functional Element not diabled Red Jacket inc...

Страница 17: ...he line length default is 501 feet and will cause a SETUP DATA WARNING if the Service Contrac tor does not enter the line length NOTE The default line type is set to FLEX A white Envirof lex PP1501 If the actual line type is not FLEX A and the Service Contractor does not select the correct line type the result may be a GROSS LINE FAIL SETUP DATA WARNING ...

Страница 18: ...ning 50 psi alarm shutdown 16 A B 40 psi warning 50 psi alarm shutdown 16 C 29 psi warning 30 psi alarm shutdown 17 18 30 psi warning 40 psi alarm shutdown 19 Not Applicable TABLE II Typical Line Pressure STP Status Pressure Range Gauge vs Console Off 17 25 psi 5 psi On 25 psi 5 psi APPENDIX A TABLES ...

Страница 19: ...with line length and line type 5 Take the first pump off pressure reading P1 If P1 is less than 12 psi a GROSS TEST FAIL alarm is posted and the test is complete 6 Wait a pre determined amount of time varies with line length and type from 5 seconds to several minutes to allow the line to lose pressure if a leak exists 7 Take the second pump off pressure reading P2 8 Compare the drop from P1 to P2 ...

Страница 20: ...Manual 577013 727 Revision B ...

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