Retard State; Transitions Between States; Transition To Startup/Shutdown State (Startup); Transition To Startup/Shutdown State (Shutdown) - Komatsu 930E-2 Shop Manual

Retard State:

This state provides the power system configuration
and overall environment for retard, where energy from
vehicle movement is dissipated in the retard grid resis-
tors in an effort to slow the truck. Retard state is strictly
a powered state.

Transitions Between States

Transitions between states under normal operational
conditions (no failures, etc.) are described as follows:

Transition to Startup/Shutdown State (Startup):

The system will transition to the Startup/Shutdown
state for the purpose of "startup" whenever execution
control is initially transferred to the application program
(e.g., after application of power, system reset, etc.).

Transition to Startup/Shutdown State (Shutdown):

The system will transition to the Startup/Shutdown
state for the purpose of "shutdown" from the Test,
Rest, Ready, or Startup/Shutdown (if previously en-
tered for the purpose of startup) state if all of the
following conditions are true:
1. System power is removed or the Control Power
Switch or Key Switch is turned off.
2. The truck is not moving.
3. There is essentially no voltage on the DC link.
4. Any testing in progress is complete.
NOTE: Testing in progress does not have to be suc-
cessful, but for the purpose of ensuring an orderly
shutdown it must be complete before the current state
is exited.
Transition from Startup/Shutdown State to Test
State:
This transition will occur automatically once initializa-
tion is complete (i.e., functions performed while in
Startup/Shutdown state for the purpose of startup have
been completed).
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Transition from Test State to Ready State:
This transition will occur upon completion of any re-
quired testing if all of the following conditions are true:
Transition to Rest State:
This transition will occur automatically from the Test or
Ready state if a request for Rest state is received from
the TCI and all of the following conditions are true:
Transition from Ready State to Test State:
This transition will occur if the truck is not moving, and
a request for testing is received.
Transition from Ready State to Propel State:
The system will transition from Ready state to Propel
state if all of the following conditions are true:
Electrical Propulsion System Components
1. The TCI rest request is not active.
2. There is sufficient voltage on the DC link.
1. Any testing in progress is complete.
2. The system temperatures are cool enough to
allow the Rest state (function of GTO Phase
Module, Chopper Module, and Motor tempera-
tures).
3. The AFSE is disconnected and there is essentially
no voltage on the DC link.
4. The truck is not moving.
1. The accel pedal is pressed.
2. A direction has been chosen, i.e., the truck is
either in FORWARD or REVERSE.
3. There is sufficient voltage on the DC link.
4. At least one of the following conditions is true:
a. The retard pedal or lever is not pressed or is
pressed such that an insignificant amount of
retarding effort is requested.
b. Truck speed is such that retard is not allowed.
5. Truck speed is less than the motor overspeed
limit.
6. The TCI accel inhibit is not active.
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