81
Troubleshooting and Service
1. Adjust the freeze "buzz" amplitude (default = 223; range = 150-255)
as described in 14. Set "Buzz" Amplitude. In general, increasing
this setting will increase the freeze vibration. However, caution
should be used since too high a value may cause the clapper to
become trapped by the electromagnetic coil.
2. Adjust the clapper spacing. Refer to Figure 7. Bend the yoke (Item
1) to locate the clapper (Item 3) closer to or further away from the
coil (Item 2), whichever is found to increase the stir/freeze wire tip
vibration.
3. Changing the coil-to-clapper spacing probably will adversely affect
the stir/freeze wire tip location; after bending the yoke, realign the
stir/freeze wire according to the recommendations in the Mandrel,
probe, and stir/freeze wire alignment section.
Check the freeze vibration amplitudes as instructed in steps 1 through
6 of this section. Optimum spacing between the coil and clapper
should provide at least ½" or 13 mm of tip vibration.
Reinstall the operating head cover. Do one last freeze test with the
operating head cover reinstalled; the freeze pulse characteristics are
slightly different with it in place.
If the freeze vibration is still not enough, do not proceed further
without obtaining Hot-Line
®
service as recommended in Obtaining
service.
If you succeed in obtaining enough freeze vibration, the stir vibration
amplitude must be readjusted as follows:
1. Press the SETUP key. If the Supervisor/operator keyswitch is in the
Supervisor position, the display will change to Select Setup Item.
2. At Select Setup Item, press the START key. The display will change
to Setup Menu #: 0.
3. At Setup Menu #: 0, press the 4 key, then press ENTER. The
display will change to Set Stir Amplitude.
4. At Set Stir Amplitude, press the START key. The display will change
to Amplitude = xxx, with xxx being some two- or three-digit
number around 98.
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