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D-TAC

D-TAC. Testing Batteries, Starters and Charging systems using the D- TAC. What is a D-TAC machine. The D-TAC machine is a combination of a hand held battery tester and a battery charger The tester and charger are electronically linked.

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D-TAC

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  1. D-TAC Testing Batteries, Starters and Charging systems using the D-TAC

  2. What is a D-TAC machine • The D-TAC machine is a combination of a hand held battery tester and a battery charger • The tester and charger are electronically linked. • This allows the tester to analyze current flow during charging which helps determine the true battery condition

  3. Conductance testing • The D-TAC is a ‘conductance’ type battery tester • The tester sends a small A/C current through the battery • The difference between the A/C signal applied to the battery and that same signal exiting the battery is directly related to the ability of the battery plates to produce electric current Signal sent into the battery Signal coming out of the battery

  4. Load testing vs. conductance testing • A load test places a very high current load on a battery which puts the battery under extreme stress and can cause damage to the battery • The D-TAC tester is able to test the battery condition using low current, which puts less strain on the battery and allows the tester to be lightweight and easily portable Load testing machine [VAT]

  5. Load testing machines • A load testing machine [VAT] draws several hundred amps from the battery while the technician monitors the voltage level between the terminals. • Normally a load test is run for 15 seconds

  6. D-TAC / charger interface • The D-TAC can also interface with a battery charger. This provides the D-TAC with data on the rate at which the battery plates can recharge. When the D-TAC is used with the battery charger a much more accurate picture of battery condition is available. LEDs indicate charger status

  7. Digital testing • The D-TAC uses digital technology to analyze the condition of the battery. It may perform several different types of test in a fraction of a second.

  8. D-TAC can test a partially charged battery • A dead or partially charged battery must be fast charged for 15 to 20 minutes before load testing with a VAT • The D-TAC can test partially charged batteries • This saves you the wasted time setting up a battery charger only to find out that the battery is no good.

  9. Basic battery test using the D-TACT • The basic battery test can be done with or without the D-TAC being connected to the charger unit. • Connect the low current battery clamps to the battery terminals.

  10. D-TAC controls Low current battery test cable Socket for adapter cables Printer Display screen Activity LED array Menu control buttons Select button On / Off button Infrared temperature sensor

  11. Select battery test from the menu Measured voltage at battery clamps • Scroll up or down the main menu to find the battery test • Press the ‘S’ select button to proceed D-TAC internal AA batteries SOC

  12. Diagnostic charge testing • If the SOC of the battery is low it is best to select “Diagnostic Charge’ from the main menu • This will require connecting the hand held D-TAC unit to the charging unit. • Since you need to charge the battery anyway why not do an advanced battery test that will insure the battery can be returned to service

  13. Identify the test vehicle - optional • If you plan to save the data from the test you will need to enter the repair order number , customer name or vehicle make and year

  14. Is battery in or out of vehicle • There may be more line ‘noise’ if the battery is connected to the vehicles electrical system

  15. Top post or side post • There is generally less resistance between the battery clamps and the terminals on a side post battery

  16. Application • Marine • Marine batteries may be deep cycle type batteries that have slightly different conductance properties • Lawn and garden • Usually deep cycle • Group 31 • One of the largest automotive batteries group size – often deep cycle • Commercial 4D/8D • Very large battery used in golf carts and marine applications – deep cycle type

  17. Battery type • AGM [Absorbed Glass Mat] batteries have slightly different conductance properties from conventional liquid electrolyte type batteries • Spiral wound batteries have a larger plate area than flat plate batteries

  18. AGM batteries are found in Toyota hybrids and motorcycles AGM battery for hybrids • The function of the 12 volt battery in Toyota hybrids is to provide current for the computer systems, lighting system and accessories • It does not provide current to start the engine when the ignition is off Positive terminal has a plastic cover

  19. Battery type • AGM Spiral are aftermarket batteries that look like a 6 pack of soda cans wrapped in shrink wrap

  20. Ratting units • The D-TAC can use other types of battery ratings but the CCA rating is the most common type found on batteries sold in the USA Japan Germany Other European countries

  21. CCA Rating • The CCA rating is usually found on the battery information placard on the top of the battery

  22. Enter the CCA rating • Use the up and down arrows to change the CCA rating

  23. Measure battery temperature • The temperature of the battery has a major effect on it’s conductance • Battery temperature must be entered to achieve accurate test results

  24. Measure battery temperature • Hold the D-TAC in a vertical position directly over the battery case • Bring the D-TAC to about 2 inches above the battery and press the right arrow button to record the temperature

  25. Battery test results • The battery test takes just a few seconds • If the battery passes the test the test result can be printed out or saved to a PC

  26. Printout • The internal printer uses thermal printing paper – no ink is required

  27. Battery needs to be recharged • This battery was essentially dead. • The test indicates that the battery is safe to be recharged • The battery should be recharged in diagnostic mode using the D-TAC and D-TAC charger

  28. Recharging required • In some cases the low SOC of the battery will require recharging before diagnosis can be completed

  29. Warning message • If the D-TAC is detached from the charging unit you will receive this warning message

  30. Mount the D-TAC to the charger unit • The D-TAC unit must be mounted to the charging unit.

  31. Connect the high current battery clamps • The charger unit has a set of high current battery clamps that need to be connected to the battery for advances diagnostic testing • The D-TAC low current clamps are not needed during the charging test Low current clamps High current clamps

  32. Charger on / off switch • The charger unit has an on/off switch located on the rear panel of the charger • When the charger is plugged in and the switch is turned on the bottom green LED on top of the charger unit will be illuminated

  33. Connect charger clamps to the battery Low current clamps do not need to be connected • The high current battery clamps should be attached to battery terminal • The D-TAC will measure battery voltage through the charger clamps during diagnostic mode charging

  34. Out of car charging • Charging can be done with the battery in or out of the car. • The low current battery clamps do not need to be connected to the battery

  35. Remove cell covers • The cell covers should be removed during charging • Any hydrogen gas that is generated during charging must be allowed to dissipate

  36. Charger unit LEDs • There are four LEDs on the top of the charger unit: • Power • Charging • Fault • Communication • The ‘Fault’ led illuminates if a shorted battery cell is detected • The ‘Comm’ light flashes when data is being transferred between the D-TAC and charger unit

  37. Select ‘Diagnostic Charge’ from the menu • If your starting from scratch you will need to select the diagnostic test from the main menu

  38. Select Diagnostic charging test • Select ‘diagnostic charge’ • Follow the menu prompts to identify the vehicle and battery parameters

  39. Diagnostic charging • During diagnostic charging the charging voltage is varied by the D-TAC while the charging current is monitored • Initial charging may be done at a relative high voltage level to see how easily the battery accepts a charge Number of charging hours multiplied by charging current Estimated time to complete charge

  40. Diagnostic charging • As charging continues the charging voltage will be reduced with a corresponding reduction of charging current • If an AGM type battery was specified the charging voltage would be limited to 14.4 volts

  41. Battery fault detected • If a shorted cell is detected the charging test will abort and the fault indicator LED will illuminate ‘Fault’ indicator

  42. Battery failed charging diagnostic test • The D-TAC measures how many amps pass through the battery at different charging voltage and the increase in voltage after charging for a short time. If the rates are too low the test will return a failure message • A heavily sulfated battery will not accept a charge

  43. Diagnostic charge test report • The report shows the SOC voltage and measured CCA after the recharge process was completed. • Additional information on charge time and the number of amp/hours accepted

  44. Battery, Starting and Charging system test • The ‘Complete System Test’ exams the battery, starting system and charging system in one test.

  45. Inductive Amp clamp • For this series of tests you will need to connect the inductive ‘Amp’ clamp to the accessory socket on the left side of the D-TAC AMP clamp

  46. Inductive clamp orientation arrow • The arrow on the inductive clamp normally faces in the direction of current flow • The inductive clamps measures the strength of the magnetic field surrounding a conductor • It is important that the clamp jaws are in firm contact with each other

  47. Setup for system test • The inductive clamps is installed surrounding the battery negative cable • The D-TAC will measure the current flowing between battery and starter motor during the cranking test and between the battery and alternator during the charging system test Inductive amp clamp

  48. System test – main menu • Begin the system test by scrolling down using the arrow buttons

  49. Zero inductive clamp before installing • Do not connect the amps clamp to the ground cable before the D-TAC completes calibration [zeroing] • Also, make sure the amp clamp is completely closed – so the ends of the clamp are in firm contact • As soon as you begin the system test the zeroing procedure will run

  50. Install inductive clamp • After this screen is displayed you can install the inductive clamp around the ground cable • The clamp should surround the cable and the ends should snap tightly together

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