Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 142
load may mean that the desired engine speed is not achieved (lug curve
operation). The example below describes the feature operation under load
conditions.
Example
The operator using the ‘raise/resume’ switch increases desired engine speed
to 2000rpm. Load is applied to the engine, which lugs the engine speed down
to 1500rpm. The operator tries to increase the speed of the engine (still under
load) back up to 2000rpm by pressing the ‘raise/resume’ switch. However as
the engine is lugging back under load, the engine speed cannot increase and
will remain at 1500rpm. Once the operator releases the ‘raise/resume’ switch,
because the actual engine speed is still at 1500rpm, the Throttle Lock set
speed will now be set to 1500rpm.
If the engine load now decreases, because the set speed has been lowered to
1500rpm the engine speed will not increase back up to 2000rpm but remain at
1500rpm. The operator can now increase engine speed back to 2000rpm
using the ‘raise/resume’ button. Figure 11.6 illustrates the Throttle Lock mode
operation.
Figure 11.6 Throttle Lock Mode Operation Under Engine Load
The Throttle Lock feature is configured to operate in this way to prevent the
engine from sudden increases in engine speed due to the raise Throttle Lock
speed button being pressed whilst the engine is under load and lugging back
along the torque curve. This operation also ensures that the engine ECM can
maintain safe engine operation under all conditions.
11.4 Multi Position Throttle Switch (MPTS)
11.4.1 MPTS Operation
The MPTS feature enables the user to select up to 16 pre-configured speed
settings as defined by four throttle switch inputs. These switch inputs can be
800RPM