METTLER TOLEDO 2158/2160/2162 VERTEX Floor Scale Installation and Service Manual
(2/01)10-4
Check Mechanical
Components
Because the VERTEX design is so simple, there are only a few mechanical components
to troubleshoot. Make sure that the platform can move freely and that the load cells are
not resting against the fixed bumpers. If the load cells touch the fixed bumpers when
there is no motion in the scale platform, check the following:
1.
The platform should be level and should not rock. Otherwise, shimming may be
required.
2.
Check the rocker pins for unusual wear. Replace any rocker pins that are unevenly
worn or have flattened bearing surfaces.
3.
Examine the rocker pin receivers in the frame. If the bearing surface is sunken,
depressed, or unevenly worn, replace the frame.
4.
If the fixed bumpers on the frame are excessively worn or damaged, the entire frame
should be replaced.
5.
Inspect the platform and frame for physical damage. Replace any platform or frame
that is bent or has broken welds.
6.
Verify that the load cell overload stop gap is set properly:
Load Cell Capacity Overload Stop Gap
250 lb 0.009" to 0.012"
500 lb 0.009" to 0.015"
1250 lb 0.012" to 0.018"
2500 lb 0.017" to 0.023"
Load Cell
Replacement
1.
Remove power to the digital indicator and disconnect the instrument cable.
2.
Remove the access plate from the platform to gain access to the junction box.
Remove the junction box cover and locate the defective load cell terminal.
3.
Disconnect the defective load cell cable from its terminal on the summing PCB.
4.
Loosen the cable connector on the junction box and remove the cable from the
enclosure.
5.
Carefully remove the platform from the frame assembly, lifting it by eyebolts
screwed into the holes in the platform. Position the platform on a stable surface that
allows access to the defective load cell and cable as well as offering protection to
the other load cells during disassembly.
6.
Attach a string to the end of the defective load cell’s cable. The string should be
long enough and strong enough to pull the new load cell’s cable through the
platform structure.
Note: 5,000-lb and 10,000-lb load
cells do not have an overload stop.
Note: The instrument cable may need
to be removed from the junction box to
allow the platform to be removed.
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General