Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 157
Varying the Rated speed and High Idle settings can alter the gradient of this
line and the resulting governor response.
Note: For more information regarding the interaction between the RS and HI
settings along with the HSG please refer to section 17.
Note: Under some circumstances the engine may not be able to reach
the desired HI setting under full throttle conditions due to machine
torque requirement at this speed.
11.11.2.2 Engine High Idle configuration
The desired engine High Idle Speed can be set using the service tool via the
configuration screen. The engine High Idle speed defaults to rated speed and
can be adjusted to a value between HILL and HIUL. As previously stated the
relationship between High Idle and Rated Speed is not mutually exclusive for
this reason HILL is set to RS and HIUL is RS + 12%. This means that the
max HI setting available for any engine is RS + 12%.
11.11.3 Engine Rated Speed
11.11.3.1 Engine Rated Speed Operation
The engine rated speed determines the point at which the High speed
governor cuts in. This speed setting is normally pre-defined as the point at
which the maximum engine power is obtained (normally set to 2200rpm). In
many cases this value is fixed due to the specific rating development.
However some ratings do offer the possibility of adjusting the engine rated
speed within the limits of the Rated Speed Lower Limit and the rated Speed
Upper limit. The values are set within the engine software and are non-
configurable.
It should be noted that for those ratings, which support the configuration of the
engine rated speed, the power and torque produced by the engine across the
adjustable speed range is not always constant. For this reason a thorough
investigation into the applications power and torque requirement compared to
that given by the engine at the new rated speed point must be made.
Consideration must also be made to the availability of Torque back-up when
reducing the engines rated speed.
11.11.3.2 Engine Rated speed Configuration
The configuration of the engine Rated Speed setting can be made using the
service tool (only for those engine ratings supporting this feature) via the
engine mode selection feature. Please refer to 16.0 Engine Governor for
more information on the configuration and use of the engine mode selection
feature.
The Engine rated speed for those engine ratings supporting the feature can
be configured to limits set by the RSLL (1800rpm) and RSUL (2200rpm).
These are fixed limits set within the engine software and cannot be altered.