Komatsu 830E-AC Shop Manual page 437

Resistance Checks, Propulsion System Circuits:
4. Prepare for the following checks by performing
the following additional procedure:
a. Make sure that all circuits are restored and the
key switch is OFF.
b. Place the GF cutout switch, located on the
right side of the control cabinet, in the
CUTOUT position (down).
c. Disconnect the CCLR1 connector and the
CCLR2 connector located in the center
compartment of the control cabinet near the
top of each vertical bus bar.
d. Disconnect the output plugs on the four VAM
panels.
e. Remove the wires on the GNDB ground blocks
located on the left wall of the right side
compartment of the control cabinet. Ensure
that the lugs on these wires are not touching
one another after the wires are removed.
f. Remove the output plugs on both gate driver
power converters (GDPC1 and GDPC2).
g. Remove the FAULTP02 wire on the GRR9
resistor.
DC Link Checks:
NOTE: Use an analog meter (VOM) to measure
resistance in the following steps. The VOM must be on
the Rx1 scale. Otherwise, the link capacitors will start
charging and an accurate reading will not be possible.
5. Place the VOM positive lead on the DC(+) link
bus and the VOM negative lead on a cabinet
ground.
Resistance should be 2 megohms or greater.
6. Place the VOM positive lead on the DC(-) link bus
and the VOM negative lead on a cabinet ground.
Resistance should be 2 megohms or greater.
7. Place the VOM positive lead on the DC(+) link
bus and the VOM negative lead on the DC(-) link
bus.
Resistance should be approximately 1500 ohms.
8. Place the VOM positive lead on the DC(-) link bus
and the VOM negative lead on the DC(+) link bus.
Resistance should be approximately 6 ohms.
E03018 10/06
AFSE P1 Adjustment:
GRR Wiring:
AC Drive System Electrical Checkout Procedure
(Release 21 Software)
Chopper Modules (CM1, CM2):
9. With the VOM set on the Rx10,000 scale,
measure the following at each chopper module in
the control cabinet:
GR(-) wire to ground resistance should be
approximately 2 megohms or greater.
GR(+) wire to ground resistance should be
approximately 2 megohms or greater.
10. Connect an ohmmeter from the wiper of Pot P1
(cathode of ZD1) to Terminal E (GND) on the
battery boost module.
If necessary, adjust P1 to obtain an ohmmeter
reading of 6000 ohms.
11. Restore the following circuits:
a. Reinsert all ICP panel cards.
b. Reconnect the ground wires at the GNDB
ground blocks.
c. Reconnect the output plugs on the four VAM
panels.
d. Reconnect the output plugs to both gate driver
power converters (GDPC1 and GDPC2).
e. Reconnect the
connectors.
f. Reconnect the FAULTP02 wire to the GRR9
resistor.
12. Measure the resistance between the FAULTP02
wire of the GRR9 resistor and ground.
Resistance should be 60 ohms.
13. Measure the resistance between the FAULTP02
wire of the GRR9 resistor and the DC(-) link bus.
Resistance should be approximately 1100 ohms.
14. Measure the resistance between the FAULTP02
wire of the GRR9 resistor and the DC(+) link bus.
Resistance should be approximately 1500 ohms.
15. Reconnect the CN1 connector to the power
supply. Remove any test equipment.
16. Activate the battery disconnect switches. Close all
open circuit breakers.
CCLR1 and CCLR2
E3-7