Komatsu 830E-AC Shop Manual page 421

Limp Home Mode
The purpose of limp home mode is to address the
situation where the truck has suffered a failure and is
not able to continue normal operation but is still
capable of "limping" (getting back to the maintenance
area or at least out of the way of other trucks). The
intent is that the limp home mode will be used by
maintenance personnel operating the truck at low
speeds with the truck unloaded. Maximum truck
speed will be limited to a reduced value while in limp
home mode.
If the TCI requests limp home mode, the state
machine will ignore the restrictions associated with
any fault for which limp home mode is possible.
The PSC will enter limp home mode if all of the
following conditions are true:
• The truck is not moving.
• The TCI is requesting limp home mode.
• The PSC is in Ready or Test state and there is no
initiated testing in progress.
• At least one inverter is functional.
• There are no events active for which limp home
mode is not possible.
• If there are any events active for which an
inverter must be turned off or cut out before limp
home mode is allowed, those actions have been
taken (inverter is turned off or cut out as
required).
NOTE: The DID panel can be used to cut out an
inverter. In some cases, certain DC link bus bars/
cables within the inverter also may need to be
removed. The DID will
personnel if any of the above actions need to be
accomplished.
E02020 10/06
prompt maintenance
Electrical Propulsion System Components
The PSC will exit limp home mode if either of the
following conditions occur:
• The TCI stops requesting limp home mode.
• An event occurs for which limp home mode is not
possible.
E2-37