Kistler-Morse KM LD360s - Manual (Page 17)

10. Mount the vessel to the Load Disc.
a. Lower the vessel gently onto the Load Discs.
(Alignment pins may be used to help guide and
position the vessel.) (See Figure 3-4)
b. Center the Load Disc top mounting holes with the
vessel mounting holes, using the clearance
available from the bottom mounting holes.
Note: If the vessel hole pattern does NOT match up with
the Load Disc hole pattern, modify the mounting holes on
the vessel. DO NOT hammer or force the Load Disc into
position by tightening the mounting bolts. The vessel holes
will need to be resized or relocated.
c. Place the four top bolts (customer supplied)
through the vessel and the Load Disc mounting
holes. The bolts must be able to pass freely
through the holes without interference.
d. Tighten the bolts, leaving a 1/4-inch gap for
positioning. (See Figure 3-2)
11. Check dead weight output.
a. Connect the Load Disc cable to the KM Test
Meter, if not already done.
b. Record the dead weight output on your Weight
Distribution Chart that was started on page 3-3.
See the example below in Figure 3-5.
c. Calculate the Output Change. (Change should be
positive.)
d. The output increase from no-load to dead weight
can be within ten percent of the AVERAGE
output increase. In the example below, the average
output change for Load Discs #1, #2 and #4 meet
this condition, while the output from Load Disc
#3 is too low indicating it is carrying less weight.
e. Load disc #3 will require a shimming and/or
leveling procedure which will distribute the weight
more evenly over all of the supports. (See
page 3-5, Leveling/Shimming)
Figure 3-5: Example of Dead Weight Outputs and Output Change
Load Disc # No-Load Output Dead Weight Output Output Change (mV)
(mV) (mV) (Dead Weight Output - No Load Output)
1 +3 +89 +86
2 +4 +87 +83
3 +2 +71 +69
4 -3 +86 +89
Note: All output changes should
be positive! If you observe a
negative output change, check
wiring polarity and vessel load
shifting.
Calculation Example:
Average Output Change =
(86mV + 83mV + 69mV +
89mV) / 4 = 81.8mV
Allowable range for Output
Change = Average Output
Change ± 10% =
81.8mV ± (.1 x 81.8mV) =
73.6 to 90.0 mV
Figure 3-4: Lower vessel onto
top plate.
Note: The example below is an
ideal situation (load is cen-
tered). Offcenter loads caused
by offset mixers or gear boxes
will place weight on some
supports more than others. Do
not attempt to shim ALL
supports to ten percent of the
average output. Balance the
support weight between each
other making sure all legs carry
a load.
Chapter 3: Mounting the Load Disc
3-4