Electrical Problems - Bomar Ergonomic Series Operating Instructions Manual

Problem
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9. Damage tooth
system of the saw
band
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10. The saw is cut
downing.
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11. Cleansing of the saw
band is not functional.
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12. The saw arm
periodically rises and
descends a few
millimeters during
the cut; this shortens
the lifetime of the
saw band
considerably.
5.2.

Electrical problems

Problem
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1. Machine is not
possible to start.
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2. When the cut is
finished, the frame is
not raised.
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3. Electric motor and
pump are without
voltage. There is no
Possible causes
Looseness in the lifting cylinder
mounting.
Bearings of guiding cubes are worn
out (rolling elements are damaged or
outside ring of bearing has conical
form).
Worn out pin of the upper or bottom
holder of the lifting cylinder.
Geometry of hard metal guiding
cubes is wrongly adjusted.
Bearings of guiding cubes are worn
out.
Grooving on the driving wheel is
worn-out.
Elastic wheel of the brush drive is
worn-out.
The shaft of the brush drive is rusted.
The brush position and the brush
cover is adjusted incorrectly – the
cover prevents the brush from
turning.
Backslash in driving wheel mounting
on the shaft.
- Worn channel for spring.
Possible causes
No voltage in the socket
Overload relay is defective (thermal
protection)
Limit switch of either saw band
stretching, band cover or saw arm is
not closed
Bottom limit switch is adjusted
wrongly.
A malfunction in the hydraulic
(pneumatic) system. The HYTOS
(BOSCH) magnetic valve is not
working.
Wrong contactor.
Repair
Bearings of guiding cubes must be replaced.
Bearings must be adjusted according to
operating instructions.
Exchange the upper or bottom holder of the
lifting cylinder.
Hard metal guiding cubes must be adjusted.
Bearings of guiding cubes must be replaced.
Driving wheel must be replaced.
Elastic wheel of the brush must be replaced.
The shaft of the brush must be cleaned and
oiled.
The brush cover must be repositioned, in order
for the brush to be able to turn.
Replace following parts:
the driving shaft for a longer one, bearings,
distance ring, driving wheel, spring, two covers
on the forehead of the shaft + screws.
Repair
Line voltage must be checked.
Each FA overload relay's condition (on/off)
must be checked.
Check the saw band stretching and covers.
Bottom limit switch must be adjusted according
to chapter ADJUSTING.
Function of magnetic valve must be checked,
valve must be switched on, and voltage across
its terminals and coil must be checked.
Replace the contactor of the engine.
93