Electrical Defects - Bomar Practix Automatic Series Operating Instructions Manual

Problem
-
12. The saw arm -
periodically rise and
fall during the cut;
this cause short
lifetime of the saw
band.
-
5.2.

Electrical defects

Problem
1. Machine is not -
possible start.
-
-
2. When cut is finished, -
the frame is not
raising.
-
-
3. Electric motor and
pump are without
voltage. Between
contactor and
thermal protector is
not voltage.
4. The indicator of -
speed saw band is
-
not functional.
-
5. Protector is switched -
off from engine
hydraulic aggregate
MA3 sometimes.
6. The hydraulic
aggregate cannot be
started
7. Hydraulic aggregate -
is switched on but
the saw arm or the
main vice is not
functional
8. Cooling is not active
-
-
-
-
Possible causes
The brush position and the brush cover
is adjusted wrong – with the brush
cannot be turned.
Backslash in driving wheel lodgement
on the shaft.
Worn channel for spring.
Possible causes
In socket is not voltage
Transfer relay is closed (thermal
protector)
Limit switch of saw band stretching,
cover of frame or cover of saw band is
not started.
Bottom limit switch is adjusted wrong.
In hydraulic (pneumatic) ring is error.
HYTOS (BOSCH) is not acting to frame
uplift.
Wrong contactor.
Sensor of speed is not adjusted.
Defective display
Wrong sensor – diode of indicator
speed is not light.
Into hydraulic system is high working
pressure.
Auxiliary contact on thermo-relay FA1
is defective.
Wrong connection of electrical supply.
The electrical phases are connected
conversely.
Lack of cooling agent.
Thermal relay is defective
Input hosepipe is broken or
obstructed.
Cooling pump protection is defective
Cooling pump is defective.
Repair
The brush cover must be posed, in order to the
brush can be turned.
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.
Repair
Line voltage must be checked.
Each FA relay must be checked.
Check of saw band stretching and covers
closing.
Bottom limit switch must be adjusted according
to chapter ADJUSTING.
Function of magnetic valve must be checked,
valve must be closed, voltage of clamps and
inductor must be checked.
Replace contactor of engine.
Sensor of speed must be adjusted.
The display must be changed.
Sensor must be changed and adjusted.
Service engineer must reduce the pressure in
hydraulic system.
Replace the defective contact on motor starter
FA1.
The phases must be switched. Only service
engineer can do this.
Fill the tank with cooling agent.
Change the thermal relay
Check the cooling circuit and perhaps cleanse
cooling system.
Check the protection of cooling pump if need
change it.
Replace the cooling pump.
53