Komatsu 930E-2, Shop Manual

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SYSTEM CHECKOUT
Test equipment needed to fully test A/C system
••••
One PTU (Portable Test Unit; lap top computer)
(The test could be more efficiently conducted with
two PTU units).
••••
One Digital Multi-Meter
••••
Several jumper wires
••••
One analog VOM
The Portable Test Unit (PTU) is used to test, download
and record system parameters on the TCI and PSC
modules. The PTU is plugged into the DB9 plug at the
rear of the console, closest to the operator seat for
monitoring the PSC module. The PTU is plugged into
the DB9 plug closest to the passenger seat for moni-
toring the TCI Module.
> The TCI and PSC can be pre-programmed at
the factory or can be programmed through the
DB9 ports in the operator cab, by GE or
Komatsu personnel only.
> The Aux-Inverter Blower system is pre-pro-
grammed at the factory or chips may be in-
stalled in the control board by GE personnel.
> The Inverters are pre-programmed at the fac-
tory.
If only one PTU is available, in some cases it will be
necessary to switch from the PSC port to the TCI port
or vice versa to complete the test when necessary to
monitor both during a test procedure. After the serial
cable has been switched, exit to the Mian Menu and
the software will automatically switch to the menu for
the connected panel.
Several different numbering methods or symbols are
used in the following procedures to denote the opera-
tion to be performed . . .
1., 2., a., b. etc.: Test preparation and instruction steps
are preceded by a number or a letter.
Procedures requiring visual checks, voltage meas-
urements etc. are preceded by this symbol.
¤ PTU keyboard entry steps are preceded by this
symbol.
{escape}: When a keyboard key must be pressed, the
key label is enclosed in braces.
••••
PTU screen display information is
shown in this type font and pre-
ceded by this symbol.
Note: The following test procedures are applicable to
Release 17 software. Procedures required for later
software versions may vary. Contact the Komatsu
distributor or factory representative for current soft-
ware version available.
Battery and Control Checks of System
WITH Battery Power OFF
BE CERTAIN LINK VOLTAGE IS DRAINED DOWN
before servicing propulsion system or performing
tests.
1. Preparation
a. Turn all three battery disconnects to the OFF
position.
b. Disconnect and insulate circuit wires 21SS and
21SR from engine starter if equipped with MTU
engine. If equipped with MTU/DDC 16V4000
or Komatsu engine, remove 21B from starter
solenoids.
c. Remove 50 amp fuse (BATFU) from inside the
control cabinet. (Grid side, lower corner.)
d. Disconnect the four CN connectors on the PSC
panel and the three connectors on the TCI
panel. Open both panels and slide cards (ex-
cept 17FB127 cards) out far enough to discon-
nect from backplane.
e. Turn OFF all circuit breakers behind operator
seat in cab and RB1, RB2, RB3, RB4, and RB5
in the Electrical Interface Cabinet.
f. Be certain key switch is OFF, 5 minute delay
timer is OFF, and the Rest Switch is in the
REST position.
g. Turn all lights and switches off.
Battery Circuit Voltage Check:
2. Measure voltage to ground at each of the following
circuits; 11, 11B1, 712 @ TB32, 11ST @TB28.
All voltages should be zero.
Resistance Checks, Low Voltage Circuits:
3. Measure resistance from ground to the circuits
listed in Table I. STOP and troubleshoot any
direct short (0 ohms) to ground.
E3-4 AC Drive System Electrical Checkout Procedure 3/01 E03015
(Release 17 Software)