Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 137
11.3 Throttle Lock (PTO mode)
11.3.1 Throttle Lock Mode Operation
Throttle Lock mode has also previously been referred to as “PTO Mode”,
“engine speed cruise control” or “set speed control”
Throttle Lock mode is a cost effective way to control engine speed as it only
requires switched inputs.
Another benefit is that it can be used in an application where it is necessary to
control the engine speed from several different points on the machine.
The disadvantage of controlling engine speed via Throttle Lock mode is that it
takes some time to ramp up or down to the required speed.
The feature is operated by 5 switches / pushbutton and an optional second
speed switch, which are shown below in table 11.3
Switch Description ECM Pin Number
Throttle Lock Mode Configuration
Raise / Lower mode
Set / Resum
e
mode
On / Off Switch 51 Enables and disables
the Throttle Lock
mode function
Enables and disables
the Throttle Lock
mode function
Raise / Resume 52 Raise only Function Raises the desired
engine speed and
functions as a
resume when set
speeds are stored
Lower / Set 43 Lower only Function Lowers the desired
engine speed and
functions as a set or
memorize current
speed demand.
Disengage 67 N/A Disengages the
current Throttle Lock
mode.
Speed Toggle 68 N/A Allows the operator
to select between
two Throttle Lock
mode set speeds if
programmed.
Table 11.3 Throttle Lock Mode Configuration
Table 11.3 also shows that the Throttle Lock mode can be configured to
operate in one of two ways and these are described below
• Ramp up / ramp down only mode. This mode uses three of the 5
available Throttle Lock functions, therefore providing a simpler Throttle
Lock operation. In this mode with the On / off switch set to On the
engine speed can be raised using the raised switched input. Applying
a signal to this input will force the engine speed to accelerate at a rate
defined by the Throttle Lock engine acceleration rate until it meets High