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Transition from Ready State to Retard State:
The system will transition from Ready state to Retard
state if truck speed is such that retard is allowed and
at least one of the following conditions exists:
1. The retard pedal or lever is pressed such that a
significant amount of retarding effort is requested.
2. All of the following conditions are true:
a. Retard speed control is selected.
b. Truck speed exceeds the set retard speed, or
the truck is accelerating such that the truck
speed will soon exceed the set retard speed if
no action is taken.
c. One or both of the following conditions are true:
1.) The accel pedal is not pressed, or
2.) The truck is configured such that accel pedal
signal does not override retard speed con-
trol.
3. Truck speed is greater than or equal to motor
overspeed limit. Overspeed will not be engaged
such that it prevents the truck from propelling at
40 mph (64 kph).
Transition from Rest State to Test State:
The system will transition from Rest state to Test state
upon release of the TCI rest request.
NOTE: A transition directly from Rest state to Ready
state is not allowed because the system is essentially
off and should be brought back on-line and checked
out before Ready state is entered.
Transition from Propel State to Ready State:
The system will transition from Propel state to Ready
state if all of the following conditions exist:
1. The accel pedal is not pressed.
2. The retard pedal or lever is not pressed or is
pressed such that an insignificant amount of re-
tarding effort is requested.
3. Truck speed is less than the motor overspeed
limit.
4. At least one of the following conditions is true:
a. Retard speed control is not selected.
b. Truck speed is below the set retard speed, and
acceleration is such that no retard effort is
(currently) required to maintain this condition.
E2-32
Transition from Propel State to Retard State:
The system will transition directly from Propel state to
Retard state if at least one of the following conditions
exists:
Transition from Retard State to Ready State:
The system will transition from Retard state to Ready
state if all of the following conditions exist:
Electrical Propulsion System Components
1. Truck speed is such that retard is allowed, and the
retard pedal or lever is pressed such that a sig-
nificant amount of retarding effort is requested.
2. Truck speed exceeds the motor speed limit.
Overspeed Will not be engaged such that it pre-
vents the truck from propelling at 40 mph (64 kph).
3. All of the following conditions are true:
a. Retard speed control is selected.
b. Truck speed exceeds the set retard speed, or
the truck is accelerating such that the truck
speed will soon exceed the set retard speed if
no action is taken.
c. The truck is configured such that accel pedal
signal does not override retard speed control.
1. Overspeed is not active.
2. 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.
3. At least one of the following conditions exists:
a. Retard speed control is not selected.
b. Truck speed is low enough such that retard
speed control is not active.
c. The accel pedal is pressed, and the truck is
configured such that the accel pedal overrides
retard speed control. This allows the configu-
ration constant to determine if pressing on the
accel pedal kicks the truck out of retard, even
if retard speed control is still active.
4. The retard torque control logic exit sequence is
complete.
E02014 3/01
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Table of Contents
Troubleshooting
