Load Cell Removal And Installation - Conair TrueBlend SB-4 User Manual

L o a d C e l l R e m o va l a n d I n s t a l l a t i o n
( M o d e l s T B 0 4 5 & T B 1 0 0 )
WA R N I N G : E l e c t r i c S h o c k
High voltages can cause life-threatening currents in the body and injury from elec-
tric shock. Allow only trained and qualified electrical technicians to work on the
electrical system. Before any electrical work, disconnect the unit from the power
supply and lock to prevent unauthorized persons switching it on.
Do NOT use excessive force. Forces that are exerted on the load cell from outside
when attaching and removing the weigh bin load cell may damage the very sensi-
tive load cell.
1
Remove the weigh bin and rear weigh bin part.
2
Disconnect the wiring that extends into the control box (see wiring diagram).
3
Remove the nuts and screws that are used to mount the load cell and weigh bin
mounting bracket to the load cell mounting bracket.
4
Mount the weigh bin mounting bracket onto the new load cell using the nuts and
screws and tighten to 10Nm. Make sure that the weigh bin mounting bracket is per-
pendicular and square with the load cell.
5
Place a small amount of removable strength Loc-tite™ onto the two screws and re-
install the load cell and weigh bin mounting bracket back onto the load cell mount.
Make sure that the load cell is mounted square with the load cell mount and tighten the
two screws to a value of 10 Nm.
6
Assemble in reverse order.
To complete the installation of the load cell, it is necessary after installation to pre-stress the
load cells.
1
Place a 3kg weight into the load cell for 10 seconds and then remove it.
2
Repeat this procedure three times.
3
Re-route and install the wiring from the load cell to the appropriate location in the
control box.
4
Complete an empty and full calibration
Hopper Setup, Calibration)
(see the Operation section entitled, Menus-
and operate as normal.
✐
NOTE: Items number 5
and 6 are used as a
stop for the load cell to
prevent damage if over
weighting occurs. If
this bolt was not loos-
ened during removal or
installation, it should
not need adjusted. If it
was loosened, the gap
needs to be reset so the
load cell contacts the
bolt when the weigh bin
is loaded with 3kg total
weight. A .040" feeler
gage could be used to
set the gap.
✐
NOTE: If the load cell is
under tension or dis-
torted by outside influ-
ences, this can usually
be recognized by a flut-
tering screen. A display
of +/- 20g or more
instead of ca. 0 g (at
zero calibration) is an
indication that the load
cell should be replaced.
M a i n t e n a n c e l
(Continued)
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