Komatsu 830E-AC Shop Manual page 411

Transitions between states under normal operational
conditions (no failures, etc.) are described as follows:
Transition to Startup/Shutdown State
(for 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 (after application of power,
system reset, etc).
Transition to Startup/Shutdown State
(for Shutdown): The system will transition to the
Startup/Shutdown state
"shutdown" from the Test, Rest, Ready, or Startup/
Shutdown (if previously entered for the purpose of
startup) state if all of the following conditions are true:
• System power is removed, or the control power
switch or key switch is turned off.
• The truck is not moving.
• There is essentially no voltage on the DC link.
• Any testing in progress is complete.
NOTE: Testing in progress does not have to be
successful, 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
initialization is complete (functions performed while in
Startup/Shutdown state for the purpose of startup
have been completed).
Transition from Test State to Ready State: This
transition will occur upon completion of any required
testing if the TCI Rest state request is not active and
there is sufficient voltage on the DC link.
E02020 10/06
for the purpose of
Electrical Propulsion System Components
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:
• Any testing in progress is complete.
• The system temperatures are cool enough to
allow the Rest state (function of IGBT phase
module, chopper
temperatures).
• The AFSE panel is disconnected and there is
essentially no voltage on the DC link.
• The truck is not moving.
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: This
transition will occur if all of the following conditions
are true:
• The accel pedal is pressed.
• A direction has been chosen (the truck is either in
FORWARD or REVERSE).
• There is sufficient voltage on the DC link.
• 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.
c. Truck speed is less than the motor
overspeed limit.
d. The TCI accel inhibit is not active.
module, and motor
E2-27