Auxiliary Blower Control System Troubleshooting - Komatsu 930E-2 Shop Manual

AUXILIARY BLOWER CONTROL
SYSTEM TROUBLESHOOTING
The Auxiliary Capacitor Panel remains charged for
at least 15 minutes after engine shutdown. Be
certain LED's D1 and D2 (4, Figure 3-9) are OFF
before working on Auxiliary Blower Control cir-
cuits. Short CP+ to CP-.
The following are recommended checks to be made to
the Auxiliary Blower Control System components and
circuits based on the detection of Event Code 636 and
the subcodes listed. Refer to Figure 3-9 for component
and terminal locations.
Subcode 00:
No fault condition - initial state upon applying power.
Subcode 01:
Description: A low DC bus voltage was detected
during power up sequence.
1. Check the 3-phase input connections and input
fuses F1 and F2.
2. Check Capacitor Bank and Controller connec-
tions.
3. If a problem was found and corrected in step 1 or
2, restart and check again.
4. If no problem was found in above steps, replace
the Controller.
Subcode 02:
Description: A high DC bus voltage was detected
during power up sequence.
1. Check Capacitor Bank and Controller connec-
tions.
2. Check DC Sense connection (connector J13 to
IV+ (red wire) and IV- (black wire)).
3. If a problem was found and corrected in step 1 or
2, restart and check again.
4. If no problem was found in above steps, replace
the Controller.
E3-38 AC Drive System Electrical Checkout Procedure
(Release 17 Software)
Subcode 03:
Description: An overcurrent condition was detected
during operation.
1. Check Capacitor Bank and Controller connec-
tions.
2. Verify the inductor connections match-up (+ and
-) from the Auxiliary Inverter and to the Auxiliary
Capacitor bank (PH+ to IV+ and PH- to IV-).
3. If a problem was found and corrected in step 1 or
2, restart and check operation again.
4. If problem still exists, disconnect AM101, AM201
and AM301 wires connecting the Auxiliary In-
verter to the blower motor.
5. Using an ohmmeter, check for shorts between
blower motor cables and between blower motor
cables and chassis ground.
6. Using an ohmmeter, check for shorts between
AM101, AM201 and AM301 wires and between
IV+ and IV-.
7. If no problem was found in above steps, replace
the Controller.
Subcode 05:
Description: A high DC bus voltage was detected
during operation.
1. Check Capacitor Bank and Controller connec-
tions.
2. Check DC Sense connection (connector J13 to
IV+ (red wire) and IV- (black wire)).
3. Attempt to restart and check operation.
4. If problem still exists, replace controller.
Subcode 06:
Description: A high DC bus voltage was detected
after the phase controller power up sequence.
1. Check Capacitor Bank and Controller connec-
tions.
2. Check DC Sense connection (connector J13 to
IV+ (red wire) and IV- (black wire)).
3. If problem still exists, replace controller.
3/01 E03015