3 i5601E Digital Display calibration control handle from full speed forward to full speed reverse on a boat that has obtained full forward speed for an extended period of time. 1. The throttle is immediately placed at “Idle.” 2. The transmission immediately shifts to “Neutral.” 3. The boat rapidly decelerates. 4. After the time set in the programmable delay the boat goes into reverse and obeys the throttle setting. This has the following advantages during an emergency (or accidental) moving of the handle from any fast forward setting to any fast reverse setting. 1. The deceleration is not quite as rapid as would occur if it went immediately into reverse.
This improves the chances the people on board will be able to brace or catch themselves; at least it reduces the effect of an immediate full reverse stop. 2. It improves the chance that reverse will actually occur as the boat has lost both some momentum (size multiplied by speed) and the engine RPM has been reduced. 3. It improves the chances the operator will have a boat that still responds to the controls and not be left dead in the water. Under normal operation the delay would be a problem. The way the system eliminates that problem is throttle setting and time. The delay time that will occur before shifting into reverse is proportional to the throttle setting.
Thus if you are running at 50% throttle the delay is half the time that is set. Example: If the programmable delay is set for 10 seconds but the boat is going at half throttle the delay will be 5 seconds. Thus as you do a normal slow down the delay keeps reducing until it is at 0. The other item that affects how much momentum a boat has at a given instance is time. If high throttle is applied for a short period of time the boat does not gain much speed so a shift into reverse is ok. Thus the system monitors the amount of time at a given throttle setting. The system multiples the programmable time setting by 4 and uses this number as a reference time.
Thus in our example the reference time is 40 seconds (10 second programmable delay times 4). Now let’s assume the boat in our example has been going half throttle for only 8 seconds. That is 1/5 the time needed for the full delay to work. This factor is added to the throttle setting which again shortens the amount of the delay. In this example the system would apply a one second delay. 10 x 50/100 x 8/40 = 1 seconds Programmable Delay Setting x Throttle %/100% x Time at Throttle/Reference Time OR 10 sec x 50% x 20% = 1 second Programmable Delay Setting x % of WOT x % of Reference Time The setting of the programmable delay should be based on the size and top speed of the boat.
Bigger and faster boats take longer to stop so they need more time. The default settings use the size of the engine to make an estimate of the time but a final adjustment by the builder or owner is always recommended. People who believe immediate reverse is the best idea always have the option to set the programmable delay setting to 0. © 2011 Yanmar Marine International • Rev. 2.0 Yanmar Electronic Control Systems Technical Manual 3:31 Menu Item Display Choice Function Prog Shift Dly 0.0 Delay of 0 seconds Thru Increments at 1.2 second 2.0 Delay of 12.0 seconds