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Summary of Contents for EsiWelma TW1-M
- Page 1 EsiWelma ® s.r.l. TW1-M and TW1nA-M Computer Head User Guide CNG Version (Methane) EsiWelma ® s.r.l. Via F.lli Canepa 134d-e 16010 Serra Riccò (Genoa) ITALY Tel: +39 010 754211 Fax: +39 010 7542178 email:info@esiwelma.it Rev. Date Page Total pages Type / N°...
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Page 2: Table Of Contents
EsiWelma ® s.r.l. CONTENTS TECHNICAL DESCRIPTION ----------------------------------------------------------------------------------------------- 4 1.1. Structural specifications ----------------------------------------------------------------------------------------------- 4 1.2. Technical data ------------------------------------------------------------------------------------------------------------- 4 FUNCTIONAL DESCRIPTION --------------------------------------------------------------------------------------------- 6 2.1. Data display ---------------------------------------------------------------------------------------------------------------- 6 2.2. Operating sequence description ------------------------------------------------------------------------------------ 6 2.2.1 Manual delivery ---------------------------------------------------------------------------------------------------- 8 2.2.2 Pre-set value delivery -------------------------------------------------------------------------------------------- 8 2.2.3... - Page 3 Photo 11: Computing Head TW1-M and TW1nA-M display front view ............43 Photo 12: Computing Head TW1-M and TW1nA-M display rear view ............43 Photo 13: Computing Head TW1-M and TW1nA-M display rear view . Neon tube back-lighting version . 43 Rev.
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Page 4: Technical Description
960g (*) Outputs device depending: Relays for TW1-M “Standard”, or Solid State relays for TW1nA-M “ATEX”. (**) The declared protection degree is referred to the metallic box. The devices enclosed by the dotted line in Figure 1 must be installed in a cabinet with at least protection degree IP54, compliant to standard EN60079-15 of ATEX directive. -
Page 5: Figure 1: Summary Electric Connections
EsiWelma ® s.r.l. Computer Head Lamp Power Supply Power Supply 230Vac o 24Vac 230Vac Optional 5 Low Flow 4 EV3 - 3 Level 3 EV2 - 2 Level 2 EV1 - 1 Level Electrovalves Power Supply 1 Electrovalves Common 230Vac o 24Vac... -
Page 6: Functional Description
EsiWelma ® s.r.l. 2. FUNCTIONAL DESCRIPTION 2.1. Data display TW1 computing head can be combined with one-nozzle fuel dispensers, data are always visualised on a 6-digit display for the amount to be paid, a 5-digit display for delivered fuel and a 4-digit display for unit price. -
Page 7: Figure 3: Refuelling Start Sequence; Cng Metric Counting Version
EsiWelma ® s.r.l. The refuelling operation begins by turning the switch to START If the dispenser is available and nozzle is connected to the refuelling receptacle on the vehicle, it’s possible to actuate the “START” switch, activating the delivering sequence of the... -
Page 8: Manual Delivery
EsiWelma ® s.r.l. Delivery ends because of: Opening of the “start” switch. Reaching of a pressure in the vehicle cylinder that makes the flow tend to zero. Reaching of the maximum allowed pressure value in the vehicle cylinder. Reaching of the maximum amount or of the maximum delivered quantity. -
Page 9: Programming By A 16-Key Keyboard
EsiWelma ® s.r.l. 2.2.4 Programming by a 16-key keyboard When computing head switches on, it makes a presence control of the keyboard. If this test is positive, the computing head manages the keyboard to pre-set a quantity or an amount to be delivered. -
Page 10: Supply Voltage Blackout Management
EsiWelma ® s.r.l. 2.2.6 Supply voltage blackout management If during normal operation a supply voltage black out or even a blackout occurs, both when nozzle is inserted and during delivery, the computing head enters a procedure called PWF which allows to memorise: amount, quantity delivered and absolute totalizer. The data display is maintained for about 30 minutes from the moment the network shortage occurred. -
Page 11: Electrical Devices Involved
EsiWelma ® s.r.l. The computing head can work in Self Service mode following the procedures required and described below: 2.5.1 Electrical devices involved In addition to the lights (red and green) the following devices will be installed on board of the Deadman's break (NO) dispenser: a “deadman’s break”... -
Page 12: Warning Light Management
EsiWelma ® s.r.l. Automatic mode (Self-Service) is almost the same but during the delivery the “deadman’s break” push button must be always pushed. If this push button is released before the refuelling finishes, delivery stops and has to be locally rehabilitated by operator using the key selector in reset position, then the user can re-start the delivery by pushing (and keeping) the “deadman’s break”... -
Page 13: Troubleshooting
EsiWelma ® s.r.l. 3. TROUBLESHOOTING During its normal working the computing head controls the internal data flow and the correspondence of data coming from outside. Possible anomalies are managed in different ways according to the damage they may cause to data. -
Page 14: Error Review Table
EsiWelma ® s.r.l. 3.3. Error review table Rev. Date Page Total pages Type / N° EW055.600D June 2018... - Page 15 EsiWelma ® s.r.l. Description of anomalies: LCD single bar presence control, with Display identification of the absent line Error Code: Erd1 o Erd2 The computing head verifies the existence Communication with Host of polling from Host every 5 seconds at least.
- Page 16 EsiWelma ® s.r.l. Data congruence Data correspondence control. The computing head checks, even during the delivery, both EPROM and RAM data. In case an error occurs, it finally stops the delivery. Error Code: FECd EPROM error When nozzle hangs on, the computing head checks the EPROM checksum.
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Page 17: Operating Modes
EsiWelma ® s.r.l. 3.4. Operating modes For fitting different field operating modes, the computing head can work in different ways, that can be subdivided in two principal categories: 1. system adaptation (to implant) 2. dispenser adaptation 3.4.1 System adaptation The management of the solenoid valves is adaptable to the type of system where the... -
Page 18: Procedures
EsiWelma ® s.r.l. 4. PROCEDURES Further the normal refuelling, there are three different possible procedures: Reading from the absolute total counter Computing head set-up (changing the configuration parameters), price change Metrical office (anomaly simulation) To start a procedure, operator has to push one of the push-buttons on the set-up board;... -
Page 19: Computing Head Set-Up
EsiWelma ® s.r.l. By pushing the black button «t», the computing head shows the first group of digits; to visualize the second, third and fourth group, advance by pushing the green button «U» once each time. p.u. p.u. p.u. p.u. - Page 20 EsiWelma ® s.r.l. The following table shows all the available parameters: Computing head set-up parameters Code Imprint Signification Range Step Default Units Functioning level ---- Functionality Electro valve 1 ---- Meter type ---- ModBus communication baud rate ---- Low flow rate 1 ...2...
- Page 21 EsiWelma ® s.r.l. Set-up parameters meaning: LF Functioning level - Allows to change the functioning mode: 1 single level computing head 2 cascade 2 levels computing head 3 cascade 3 levels computing head St Functionality Electro valve1 - Allows to change the intervention mode of the...
- Page 22 EsiWelma ® s.r.l. - It’s the address that the computing head assumes AL LAN IP when connected to a Host Computer. - It’s the value over which the computing head HF High flow rate blocks the refuelling procedure charging the exceeded flow rate to a possible mechanical fault.
- Page 23 EsiWelma ® s.r.l. tF duration of the first puff - To measure the CNG pressure at the beginning of the delivery, it is necessary to fill the gas pipeline. tF is the time assigned to this activity. (the parameter is visible only when AC=1)
- Page 24 EsiWelma ® s.r.l. cM Hose compensation - It shows how many dag are inside the hose @ normalized pressure of 220bar, in preset mode. cM=0 disable this compensation. tP Nozzle acquisition time - Determines how many seconds the head has to...
- Page 25 EsiWelma ® s.r.l. MC Meter zero setting - This procedure allows to set the mass flow meter to zero. By placing the MC parameter to 1, the computing head automatically provides, at the end of the set-up, to perform the zero setting of the mass flow meter.
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Page 26: Simple Parameters
EsiWelma ® s.r.l. 4.2.1 Simple parameters Choose the parameter to be modified (push the green button «U» to change the parameter). Push the black «t» button to increase the current parameter value. Push the red «S» button to annul or p.u. -
Page 27: Complex Parameters
EsiWelma ® s.r.l. 4.2.3 Complex parameters Some parameters are characterized by a higher number of digits; to modify this number it’s necessary to use a different procedure and visualization: PS parameter: specific weight of the delivered product, used to convert the visualization of the delivered from Kg to Smc. -
Page 28: Figure 21: Changing Password
EsiWelma ® s.r.l. In case of affirmative answer, it’s possible to modify the password with a similar procedure as already described before. Password is structured as follows: Manager password value: 1XXXX It exclusively allows to change price. The first value is always 1 and identifies the codes reserved to the manager plant. -
Page 29: Price Change
EsiWelma ® s.r.l. 4.2.5 Price change After pressing red «S» button and entering the set-up, the computing head asks for password; if it has not been previously modified, its default value is 10000. To enter the exact code, follow the procedure below: Push black «t»... -
Page 30: Metrical Check Procedure
EsiWelma ® s.r.l. In case of affirmative answer, it’s possible to change the password with a similar procedure as already seen: Press black button until the desired value for the first digit is obtained. Press red button to pass to the next digit. -
Page 31: Hardware Personalization
EsiWelma ® s.r.l. 5. HARDWARE PERSONALIZATION On the CPU 3 selectors (JP) are available. They are placed in the case protected by the metrical seal and allow to modify the functionality of the computing head as follows:: Delivered quantity expressed in Kg or in Smc... - Page 32 EsiWelma ® s.r.l. The mass flow meter can be configured in function of the following operating parameters: Type of mass flow meter: – Modbus Krohne, MicroMotion, Endress+Hauser JP10, JP11 on the left – Impulsive Rheonik, MicroMotion, Endress+Hauser JP10, JP11 on the right...
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Page 33: Optionals
EsiWelma ® s.r.l. 6. OPTIONS 6.1. External 4x4 keyboard A 16-key keyboard could be necessary. Both language and functions of this keyboard can be adjusted on customer’s demand. With an external keyboard operator can choose Euro or litre pre-set. Photo 5: Pre-set keyboard adjustement on customer’s demand 6.2. -
Page 34: Anomaly Signalling Device
EsiWelma ® s.r.l. 6.3. Anomaly signalling device If a detected anomaly has to be shown in remote, a simple device can be used: it is connected to the same flat cable used for display and allows to activate a free voltage contact by whom a lamp or any other signalling device can be supplied. -
Page 35: Electrical Connections
EsiWelma ® s.r.l. 7. ELECTRICAL CONNECTIONS 7.1. Low voltage connections Usually all the performed controls with micro switches and buttons are normally open and must close on 0V when used. Particularly: Start contact open in stand-by, closed during delivering High pressure contact N.O. - Page 36 EsiWelma ® s.r.l. Terminal Board TB2 See Warning Power links Clear 10Litres or € preset value 1Litre or € Preset value Show amount in € currency 0V field Display links Terminal Board TB3 See Warning Max Pressure not used 0V Flowmeter...
- Page 37 EsiWelma ® s.r.l. Terminal Board TB4 See Warning Power Links Fluid Temperature (opzional) 6 0V Field 7756ac PT100 5 TR2- 4 TR2+ 3 0V Field Ambiente Temperature (dispenser ground) 2 TR1- 1 TR1+ 7756ac PT100 Display Link Terminal Board TB5...
- Page 38 EsiWelma ® s.r.l. Connector J1 Power Links Display Link to Display Connector SET - UP Keypad Display-2 Display-1 p.u. p.u. Self-Service Failure Output I/O Expansion Device board 4x4 Keyboard Keyboard Interface Self-Service N.U. Delete N.U. connections N.U. Enter Auto/Man (Auto=closed) N.O.
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Page 39: High Voltage Connections
EsiWelma ® s.r.l. 7.2. High voltage connections The computing head provides voltage free contacts, able to pilot resistive and/or inductive loads with the following characteristics: Voltage max 270Vca Depending on the output device used: → Current max 3A Relè (Standard) →... - Page 40 EsiWelma ® s.r.l. Terminal Board TB7 Green Lamp Red Lamp Lamp Common Lamp Power Supply 230Vac or 24Vac Power links Display links Terminal Board TB8 Neutral Phase Computer Head Power Supply Power links 230Vac Display link Rev. Date Page Total pages Type / N°...
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Page 41: Identification Of Computing Head Tw1
CLASS M2 Mechanical condition: CLASS M2 Electromagnetic condition: CLASS E2 Electromagnetic condition: CLASS E2 Figure 28: TW1-M; “Standard” Identification Figure 29: TW1nA-M; “Atex” Identification plate plate On the plate the following data are shown: - Device manufacturer. - Power supply tension (voltage) and Current - Address. -
Page 42: Mechanical Clamping
EsiWelma ® s.r.l. 9. MECHANICAL CLAMPING The CPU of the computing head is settled into a metallic box which can be clamped in a vertical as well as a horizontal position. Some tangs assure a correct clamping: N° 4 Eyelets for CPU clamping Figure 30: Clamping of the CPU box There are some clamping points also for displays. -
Page 43: Legalizing Procedure Of The Computing Head Tw1
Lead that prevents from access the display plate. Photo 11: Computing Head TW1-M and Photo 12: : Computing Head TW1-M TW1nA-M Display front view and TW1nA-M Display rear view It’s possible to use Lead that prevents from...
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