Triner Scale RAVAS-310 - Manual (Page 18)

18
4 TROUBLE SHOOTING
No power Change
batteries
Replace battery pack Use a fully charged battery pack. (see page 5)
12Vdc on the
board Check the board for
burned components Picture of component most likely to blow when
batteries have been entered the wrong way.
Accuracy No
repeatability Check if there is a
mechanical problem. Load left and right fork with for example body weight
and see if weight changes when you are in different
positions on the scale.
There should not be a difference larger than 2 lb.
If there is a bigger difference then 5 lb you have a
load cell or a mechanical problem.
To make sure it is a mechanical problem, repeat test
with a heavy load on the scale, Lift a pallet with 2000
or 3000 lb.
Reset Indicator for 0 lb using the tare function.
Load corners with body weight by standing on or on
the sides of the pallet. If readings change more than 5
lb you have a mechanical problem.
The push rods in the forks may not interfere with the
load cells. Take of the fork shoe by unscrewing the
nuts on the bottom side of the pallet truck.
Push the pushrods sideways towards the load cells to
see if they come in contact with the load cells: see if
they can interfere with the load cells.
With the forks lifted half way up, the brackets for the
loading wheels may touch the fork shoe. By taking off
the fork shoe, Scratches will show if it does and where
it does.
Check if bolts are loose.
Check the load cells. If
one is broken or gives
more or less signal
than the others, the
scale will give different
reading depending
how it is loaded. To be sure that it is not a mechanical problem, load
the load cells directly. Take off the fork cover. Try to
apply weight 25 to 50 kg / lb, direct onto each load
cell. If the indicator shows the same reading, the load
cells are OK.
Tap with a hammer onto the load cells. Do not be
afraid to break it. Repeat the test for each load cell.
Measure resistance with ohm meter between wires
and load cell body. Do this with the other load cells
disconnected from indicator. No resistance is allowed.
The load cells should have +/- 350 ohm between the
signal wires: yellow and green, and excitation wires,
black and red.
Check cables Bad connections will cause changes when moving the
scale.
Bend and move the cable briskly especially where the
cable is moving continuously while lifting. While doing
so, look at the display to see if it reacts to the
movements.