AC DRIVE SYSTEM ELECTRICAL CHECKOUT PROCEDURE
AC Drive System Maintenance
DANGEROUS VOLTAGE LEVELS ARE PRESENT
WHEN THE TRUCK IS RUNNING AND CONTINUE
TO EXIST AFTER SHUTDOWN IF THE REQUIRED
SHUTDOWN PROCEDURES ARE NOT FOL-
LOWED.
Before attempting repairs or working near propul-
sion system components, the following precau-
tions and truck shutdown procedure must be
followed:
•
••
•
DO NOT step on or use any power cable
as a handhold when the engine is running.
•
••
•
NEVER open any electrical cabinet covers
or touch the Retarding Grid elements until
all shutdown procedures have been com-
pleted.
•
••
•
ALL removal, repairs and installation of
propulsion system electrical components,
cables etc. must be performed by an elec-
trical maintenance technician properly
trained to service the system.
•
••
•
Power cables must be cleated in wood or
other non-ferrous materials. Do not repair
cable cleats by encircling the power ca-
bles with metal clamps or hardware. Al-
ways inspect power cable insulation prior
to servicing the cables and prior to return-
ing the truck to service. Discard cables
with broken insulation.
•
••
•
IN THE EVENT OF A PROPULSION SYS-
TEM MALFUNCTION, a qualified techni-
cian should inspect the truck and verify
the propulsion system does not have dan-
gerous voltage levels present before re-
pairs are started.
•
••
•
If weld repairs are required, the welding
ground electrode should be attached as
close as possible to the area to be welded.
NEVER weld on the rear of the Electrical
Control Cabinet or the retard grid exhaust
air louvers.
Power cables and wiring harnesses
should be protected from weld spatter and
heat.
•
••
•
Prior to welding, disconnect Engine Con-
tro System (ECS) harnesses and ground
wire (MTU engine). If equippped with
DDEC or Komatsu engine, disconnect
ECM harnesses. GE cards should be
pulled forward far enough to disconnect
card from backplane connector.
•
••
•
Some power cable panels throughout the
truck are made of aluminum or stainless
steel. They must be repaired with the
same material or the power cables may be
damaged.
TRUCK SHUTDOWN PROCEDURES
After the truck is parked in position for the repairs, the
truck must be shut down properly to ensure the safety
of those working in the areas of the deck, electrical
cabinet, traction motors, and retarding grids. The fol-
lowing procedures will ensure the electrical system is
properly discharged before repairs are started.
If a problem occurs in the AC drive system prevent-
ing NORMAL shutdown procedures, ADDITIONAL
PRECAUTIONS ARE NECESSARY to ensure dan-
gerous drive system voltages are not present
when tests or repairs are performed.
E03015 3/01 AC Drive System Electrical Checkout Procedure E3-1
(Release 17 Software)
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