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3. Inverter Powerup Tests - The purpose of these
tests is to verify that each inverter sub-system is
functional:
a. Enabling Inverter Powerup Tests - The pow-
erup tests for a given inverter will be enabled if
all of the following conditions are true:
1.) The system is in Test state for the purpose
of powerup.
2.) The associated gate drive power converter
has been enabled.
3.) The engine is running.
4.) Battery voltage is at least 25 VDC.
5.) The inverter is requesting that the low volt-
age and/or high voltage powerup tests be
performed.
6.) The inverter has not been physically cut out
of the system.
7.) Active event restrictions do not preclude
powering the DC link or running the inverter.
b. Low Voltage Test - A given inverter will auto-
matically perform its low voltage test if needed
once inverter powerup testing is enabled per
the above requirements. The PSC will declare
the test failed and log an event if the test does
not successfully complete within an expected
time period.
c. High Voltage Test - If the low voltage testing
defined above is successful for a given in-
verter, the inverter will automatically perform its
high voltage test if needed once there is suffi-
cient power on the DC link. The PSC will
declare the test failed and log an event if the
test does not successfully complete within an
expected time after the DC link is sufficiently
powered.
4. DC Link Capacitance Test - Test will run once
every 24 hours when conditions allow, normally
after a VI-test during normal powerup sequence.
This test can also be run from the DID panel to
aid in troubleshooting. During test execution, en-
gine speed is set to 1500 rpm and the link is
charged to 1200VDC. The engine is then returned
to idle while the link is allowed to discharge to 100
volts.Total link capacitance is then calculated
using the time it took to discharge. If capacitance
is getting low, but still OK, event 70 logs. If ca-
pacitance is below the minimum allowable level,
event 71 logs and the truck is restricted to 10
MPH. If test is not able to complete after numer-
ous attempts, event 72 logs, indicating a problem
in the truck's ground detection circuit, and truck
speed is limited to 10 MPH.
E02014 3/01
Initiated Tests
These tests are performed when requested by main-
tenance personnel; the truck must be in test mode for
these tests to run:
Periodic Tests
These automatic tests are run continuously during the
operation of the truck to verify certain equipment.
Event Restrictions
The PSC software will not override an event restriction
as long as Limp Home mode is not active. Transitions
to restricted states will not be allowed. If the system is
in a state which becomes restricted, it will transition
down to the highest unrestricted state. The order from
lowest to highest state is Startup/Shutdown, Rest,
Test, Ready, Retard, Propel. Transitions to the Test
state or lower states in reaction to event restrictions
will not be allowed until the truck is not moving.
NOTE. Limp Home mode is a state which is entered
when the truck has suffered a failure and is not able to
continue normal operation but is still capable of "limp-
ing" (getting either back to the maintenance area or at
least out of the way of other trucks).
Event Restrictions associated with a given event are
defined below:
No Power
No retarding or propulsion effort allowed. No power
allowed on the DC link.
No Propel
No propulsion effort allowed. Retard effort and power
on DC link is allowed.
System Warning
An event has occurred which indicates that if corrective
action is not taken, a more restrictive event may soon
follow. No restrictions. The DID will display a warning.
None
No restrictions (nonrestrictive event).
Electrical Propulsion System Components
1. Maintenance Tests - The purpose of these tests
is to facilitate verification of system installation
and wiring (particularly the "digital" interfaces -
relays, contactors, etc.).
2. Self-load Test - Self-load testing is a means by
which the truck diesel engine can be checked for
rated horsepower output.
E2-37
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Table of Contents
Troubleshooting
