Current Limiter - Yanmar 3TNV Series Service Manual

11.2.3 Current limiter

In the cases listed below the warranty shall not be deemed to apply. Please be sure to read these
conditions carefully when planning to use it with other equipment. Also be certain to give appropriate
guidance on usage to the user.
(1) When an over-discharged battery is used
Use of booster starting with an over-discharged battery (when the voltage has dropped to 8V or less)
will destroy other electrical equipment by generating an abnormally high voltage. A specialized battery
charger should be used to recharge such an over-discharged battery (when the voltage has dropped to
8V or less).
(2) When checks for malfunctioning are not performed
When high voltage noise from other electrical equipment is impressed on the current limiter upon
turning off the key switch, the current limiter can be damaged and cause loss of control over the output
voltage. Other electrical equipment may also be damaged if this happens, so surge killers should be
fitted to the electrical equipment whenever necessary. Be sure to check prior to mass production
whether electrical noise might damage the current limiter by turning the key switch and other electrical
equipment on and off while the engine is running, using both the vehicle and the wire harness that will
be used in mass production.
(3) Removal of the battery cable during operation
The current limiter may malfunction if the battery cable and/or battery are removed during operation,
depending on the kind of electrical equipment being used, causing loss of control over the output
voltage. In such cases, the current limiter and other electrical equipment will be damaged by the
generation of a continuous high voltage of 24-43V (for 5,000rpm dynamo). All electrical equipment
falls outside the scope of the warranty under these circumstances. Be sure to warn the user not to
remove the battery cable and/or battery during operation.
(4) If the battery cable can be attached in reverse
The current limiter's SCR diode will be destroyed if the plus and minus ends of the battery cable are
connected the wrong way around. This causes charging malfunctioning and burns the harness. Give
the user a cable of such a length that it cannot be connected the wrong way and warn the user against
connecting the cable backwards.
(5) Non-use of the Yanmar wiring diagram
Use without prior consultation of any wiring diagram other than that provided by Yanmar removes any
breakdown of any electrical equipment from the warranty.
(6) Installation environment
Observe the following when installing the current limiter:
1) Do not install it on the engine.
2) Place it in a well-ventilated place with an ambient temperature of 65
3) Ensure that the cooling air flows in the right direction for the current limiter's cooling fins.
4) Do not use the earth wire of the current limiter to earth any other electrical equipment.
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11. Electric Wiring
or less.