Related Manuals for Farringdon RCA5 Series
Summary of Contents for Farringdon RCA5 Series
- Page 1 The RCA50 Series of Tachometers Installation and Operating Instructions Revision 8...
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Page 2: Table Of Contents
Contents Introduction and Outline Specification Fitting Your Tacho Mounting the Tacho Connecting the Tacho The Push Button Shift Lights Setting Up Your Tacho Using the Push Button Number of Cylinders Tell-Tale and Other Modes Ignition Pulse Filter Shift Light Settings Resetting the tell-tale. -
Page 3: Fitting Your Tacho
1. Introduction The Farringdon RCA50 Series of tachometers are believed to be the first available with stepper motor driven main and tell-tale hands. The tell-tale hand is a very useful feature especially when used in its auto-reset mode and not just an extra hand to make it look more like historic chronometric types. -
Page 4: Connecting The Tacho
Connecting the Tachometer The latest tachos have a small M8 connector and the back surface and are supplied with a moulded mating connector with flying leads. These are connected as follows: White Ground or Earth Connect this to a good chassis ground 12 volt Supply Connect to a fused 12 volt supply from master switch (preferred) or ignition switch... -
Page 5: The Push Button
Connect these wires to the red wire of the shift light. Connect the black or blue wire of the shift light to ground. The shift light outputs are positive 5 volt, 50 mA signals that are designed to drive the LED shift lights supplied by Farringdon. Do not connect filament type lights to these outputs—it will not drive them! -
Page 6: Using The Push Button
Number of Cylinders (tell-tale at 1) In order to allow for uneven firing engines, Farringdon uses the number of trigger pulses in two full turns of the engine to calculate the rpm. Unless you have a special sensor, this is likely to be the number of cylinders connected to the coil you are using. - Page 7 Mode (tell-tale at 2) The following table shows the value to set for the mode: Mode Tell-Tale Trigger Pulse Chromometric Auto reset Negative Manual Negative Auto reset Positive Manual Positive Auto reset Negative Manual Negative Auto Positive Manual Positive Tell-Tale Modes The tell-tale needle on original chronometric tachometers was mechanically pushed to the highest reading reached by the main hand.
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Page 8: Shift Light Settings
Shift Light Settings (tell-tale at 4 and 5) The next two settings are for the shift lights. Use the push button to set the rpm at which you would like the first and second shift lights to illuminate. Remember to hold the push button pressed for 5 seconds after each adjustment to move on to the next. -
Page 9: Purpose
The Tacho Filter Unit is a simple filter contained in a small plastic box that may be required when using a Farringdon RCA5x Tacho with contact points ignition systems. It may be of use with some electronic systems as well. Essentially the unit filters the signals taken from the negative (on negative earth systems) side of the coil. -
Page 10: Troubleshooting
Make sure the shift lights are wired correctly incorrectly. Shift Black to black. Check RPM settings for Shift RPM setting wrong Lights. Farringdon Instruments Limited .The Old Stables, Manor Farm, West Worldham. ALTON . Hampshire GU34 3BD. Telephone 01420 541591. www.farringdoninstruments.com...