Bomar Ergonomic 320.250 DG, Operating Instructions Manual

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63
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Problem Possible causes Repair
- The brush position and the brush cover
is adjusted wrong – with the brush
cannot be turned. The brush cover must be posed, in order to the
brush can be turned.
12. The saw arm
periodically rise and
fall during the cut; this
cause short lifetime of
the saw band.
- Backslash in driving wheel lodgement
on the shaft. Change the driving shaft for a long one, new
bearings, distance ring, new driving wheel, spring,
two covers on the forehead of the shaft + screws.
- Worn channel for spring.
5.2. Electric problems
Problem Possible causes Repair
1. Machine is not
possible start.
- In socket is not voltage Line voltage must be checked.
-
Transfer relay is closed (thermal
protector) Each FA relay must be checked.
- Limit switch of saw band stretching,
cover of frame or cover of saw band is
not started. Check of saw band stretching and covers closing.
2. When cut is finished,
the frame is not
raising.
- Bottom limit switch is adjusted wrong. Bottom limit switch must be adjusted according
to chapter ADJUSTING.
- In hydraulic (pneumatic) ring is error.
HYTOS (BOSCH) is not acting to frame
uplift. Function of magnetic valve must be checked,
valve must be closed, voltage of clamps and
inductor must be checked.
3. Electric motor and
pump are without
voltage. Between
contactor and
thermal protector is
not voltage.
- Wrong contactor. Replace contactor of engine.
4. The indicator of speed
saw band is not
functional.
- Sensor of speed is not adjusted. Sensor of speed must be adjusted.
- Defective display The display must be changed.
- Wrong sensor – diode of indicator
speed is not light. Sensor must be changed and adjusted.
5. Protector is switched
off from engine
hydraulic aggregate
MA3 sometimes.
- Into hydraulic system is high working
pressure. Service engineer must reduce the pressure in
hydraulic system.
6. The hydraulic
aggregate cannot be
started
Auxiliary contact on thermo-relay FA1 is
defective. Replace the defective contact on motor starter
FA1.
7. Hydraulic aggregate is
switched on but the
saw arm or the main
vice is not functional
- Wrong connection of electrical supply.
The electrical phases are connected
conversely. The phases must be switched. Only service
engineer can do this.
8. Cooling is not active
Lack of cooling agent. Fill the tank with cooling agent.
- Thermal relay is defective Change the thermal relay
- Input hosepipe is broken or obstructed. Check the cooling circuit and perhaps cleanse
cooling system.
- Cooling pump protection is defective Check the protection of cooling pump if need
change it.
- Cooling pump is defective. Replace the cooling pump.