| Description |
- The balance weights, especially the pulley end weight,
is running away or not staying in the set position.
- The Pulley end weight makes a distinct ratcheting sound
when it runs away.
- Noticeable clunking noise from the balance weights when
the drum starts and stops.
- Timeout moving engine actuator error that is
traced to the balance weight actuators.
- When plate size is changed, a balance weights not
detected warning is displayed. The engine then does
a "bal find" to locate the balance weights and
move the weights to the new position.
- Abnormal vibration of engine assembly due to balance
weight being in the wrong position.
- Signs of black powder around pullet end balancer.
|
| Causes |
If the NVS parameter
>>set AL bdo has been
changed from the factory setting, the above symptoms could be
experienced. It is possible that the NVS parameter was set to
default (-150 tach ticks) during the last firmware upgrade. Some
engines are experiencing excessive wear on the detents in the
drive pulley where the drum balancer locking pin engages, to the
point that the locking pin slips out of the detent. This wear
occurs on the backside of the detents, on the inside of the
groove. While the normal operation of this mechanism may produce
some wear, and the NVS parameter >>bdo
(balance detent offset) is not correctly set, the detent and the
locking pin will not be aligned when the locking pin is engaged.
This will result in the locking pin abrading the sides of the
detent as it engages. |
| Solutions |
Check the current setting
for NVS parameter >>bdo:
- At the diagnostic terminal, type >>set
al bdo
| Set name |
Full name |
Active |
Saved |
Default |
Units |
| lecpos |
lec_drum_pos |
12345 |
12345 |
12460 |
tach ticks |
| tecpark |
tec_park_pos |
11263 |
11263 |
11350 |
tach ticks |
| stl |
sensor_to_lec |
507 |
507 |
509 |
mm |
| tecoff |
tec_offset |
1250 |
1250 |
1365 |
tach ticks |
| bdo |
balance_detent_
offset |
-250 |
-250 |
-150 |
tach ticks |
- If the active setting is the same as the default
setting, there is probably an error. You can check what
the factory setting was in the Factory Settings section
of the corresponding product's Technical Library page.
- To reset this parameter, refer to the NVS Parameter bdo
Calibration section in the 'Adjusting the balance
actuation assemblies' at Procedures/Engine/Balance
weights.
- If the bdo parameter was incorrect, the drive pulley
detents should be inspected for evidence of excessive
wear.
- If the detent slots are worn to the point that the
detent pin is no longer a snug fit, order a new Detent
Arm Assembly, P/N 50-2399A. This new Detent Arm has a
double tapered pin that may improve the engagement with
worn detent slots.
- Another option is to reposition the Drive Pulley so that
the worn detents are no longer used.
- Please notify the appropriate Product Support Specialist
(listed below) with the machine serial number and
location if either an incorrect bdo setting is found or
if the drive pulley shows signs of excessive wear on the
balancer detents.
|
