Installation Manual

Electrical & Electronic Application And Installation Manual
Production Release Version 1.0
Page 143
operated via individual or combined switching devices such as rotary
switches. Care should be taken however when selecting switches to ensure
that they are break before make.
This is a very powerful and flexible feature that may be used in a number of
ways. For example:
• Principal speed control method for hydrostatic machines where engine
speed is selected and then not required to be frequently changed by
the operator. It is in this respect a good alternative to a hand throttle as
the speeds selected on the switch. can be designed to correspond to
the optimum operating speeds of hydraulic pumps. A rotary encoded
10 position switch component is available for this function. Please
contact the electronic applications team for further details.
• Machine limp home speed feature. For example, if the normal throttle
fails the operator could remove a fuse or a link and the engine would
go to a speed that would allow the machine to be moved. In this
application only one of the available 4 switch inputs would be used.
• Elevated idle. For example the OEM could increase the idle speed
when work lights are switched on so that the alternator will provide
sufficient current to recharge the battery. In this application only one of
the available 4 switch inputs would be used.
If a switch combination is detected which has been configured as “Not Valid”
then a fault code will be raised (91-2 or 774-2) and the ECM will ignore the
MPTS for the rest of the key cycle.
11.4.1.1 Intermediate Speed Function
The MPTS function can be installed to provide an intermediate set speed
option via pin 43 of the ECM J1 connector. This function gives the option of a
single set speed that overrides all other speed requests including TSC1. This
function can be activated when required via the switching of input pin 43 to
ground.
This feature can be used in conjunction with the MPTS, however if both
functions are required pin 43 will be dedicated to the intermediate speed
function leaving the remaining three inputs for the MPTS function. This will
reduce the number of MPTS set speeds available for selection from 16 to 8.
11.4.2 MPTS Configuration
The MPTS option can be configured using the EST service tool by selecting
the following menu location Service / Throttle Settings.
The table below gives an example of how the four switchable inputs can be
configured to give a range of set engine speeds.