User manual VDO SUMLOG

[. . . ] Disconnect the minus polarity at the battery before starting work to prevent the risk of short-circuiting. Short-circuiting can cause cable harness fires, battery explosions and damage to other electronic systems. Please note that all volatile electronic memories will lose their contents, and will have to be re-programmed if you disconnect the battery. Run the engine compartment blower for a certain time before starting work in a gasoline engine compartment. [. . . ] Example: Indication of the total distance (2312. 3 in this example) 23I2. 3 or of the trip distance (12. 96 in the example) The units of the indicated speed and distance depend on the selected calibration factor (see page 29). The total distance is displayed from 0. 0 to 99999. 9 and the trip distance from 0. 0 to 999. 99, thereafter the counter rolls over to zero again. The trip distance is reset to zero by keeping the pushbutton pressed for about 5 seconds when the trip distance is displayed. Calibration of the VDO Sumlog After installation of the system your VDO Sumlog must be calibrated to obtain speed and distance measurements with the maximum accuracy. The distance between these two points defines the measuring length (see page 29). During the trip from one point to the other, the VDO Sumlog measures the covered distance. In flowing waters it is necessary to make the measuring run in both directions to compensate for the influence of the current. For indicating units with a simple graduation (12, 30 or 50 without unit indication): Select the desired display unit (knots, mph or km/h) for your operation prior to the measuring run. Please note that it is not possible to switch to a different indicating unit after calibration; this requires a new calibration. For the indicating unit with twin graduations (50 kn/mph): Select nautical miles as the unit for the measuring length. 28 CALIBRATION Measuring length: Make a measuring run at a cruising speed, which remains as constant as possible. Check that the calibration factor is C=1. 00 (as supplied) at the beginning of the measuring run, and that the trip distance counter is set to zero. The following example refers to a measuring run in water without a current with a measuring length of 2 nautical miles (nm). Set the trip distance counter to zero (see page 28) when passing starting point A. Follow the measuring length on a straight line and note the indicated value (1. 74 nm in this example) when passing end point B. Calculate the calibration factor C with the following formula: Effectively covered distance (A-B) 2. 00 nm C = --------------------------------------------------- = -------------- = 1. 15 Indication of the display (A-B) 1. 74 nm Enter the calculated calibration factor C (1. 15 in the example) as follows: Keep pushbutton pressed and switch the indicating unit power supply on. The display shows , , CAL". 2 (3 , 0 , 7 nm km ) CAL Release the pushbutton. The current calibration factor is displayed (as supplied: 1. 00): c 1. 00 29 CALIBRATION Press the pushbutton to increment up to the calculated calibration value. Incrementing is automatic if you keep the pushbutton pressed. c 1. 15 The calibration factor setting range is from 0. 50 to 2. 50. On reaching 2. 50 the counter rolls over to the calibration factor 0. 50 again. The set calibration factor is stored if the pushbutton is not activated for a further 5 seconds. In the case of a measuring run in flowing water repeat the same distance measuring steps in the opposite direction (measuring length C-D). The calibration factor is calculated with the following formula: Effectively covered distance (A-B) + (C-D) -----------------------------------------------------------Indication of the display (A-B) + (C-D) Do not use the GPS navigator as a reference for VDO Sumlog calibration. The GPS Navigator indicates speed over ground (SOG), but the VDO Sumlog measures speed through water. C= 30 TROUBLESHOOTING / MAINTENANCE Troubleshooting Fault: - No Sumlog function Cause and correction: - Check electrical connections per wiring diagram. - Check supply voltage, Supply voltage 10. 8. . . 32 VDC, - Check fuses in fuse box. - Check free movement of paddle wheel, remove dirt deposits, replace paddle wheel if necessary. - Check paddle wheel shaft for wear, replace paddle wheel if necessary. [. . . ] Always insert the blind plug when the sending unit has been removed. 35 INSTALLATION Replacement of the paddle wheel The paddle wheel of the sending unit is rotated by the flow of water. The rotational speed of the paddle wheel is measured without contacts, and transmitted to the indicating instrument. Use a screwdriver to replace the paddle wheel and its shaft. Carefully lift the paddle wheel shaft upwards to remove it from the sending unit. Insert the new shaft into the new paddle wheel and install shaft and wheel, again using the screwdriver. [. . . ]