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The balance control also can be used in order to keep
the electrode tip shape as the best possible. When the
length of positive half-cycle is increased, the electrode
tip becomes more ball-sha-ped.
OPERATION DISTURBANCES
In order to locate an operation disturbance, the steps in
the following instructions should be taken. For operation
problem reason may be caused by bad electricial con-
nections in the welding cables or intermediary cables, or
by wrong position of one of the control switches of units.
Before finding out the reason for an operation distur-
bance connect the remote control unit on the control
connector of the power source. If a continuous idling
noise is generated by the machine, then the cause of
the problem is probably outside of the power source.
Loss of a phase in the mains supply
The overvoltage releasing of the machine may operate
if there is a very short (less than 1 s) break in the mains
supply. Normal operation is then returned by resetting
once with the main switch of the machine.
A very common fault situation is the loss of one phase to
the machine. The most common reasons are through-
burning of a mains supply fuse, or a bad connection in
the plug of the mains connection cable or on the termi-
nal block.
The loss of one phase is not always indicated by the
pilot lamp on the front panel of the machine, but it can
be recognized by the very poor welding characteristics
achieved.
Operation of the overvoltage releasing
The machine has an overvoltage releasing which stops
the operation if the welding pole voltage exceeds 100 V.
The operation is restored by resetting with the main
switch.
Operation of the overload protections
The overload protections (thermal protections) of the
machine operation if the machine is continuously load-
ed above the rated values. The protection may also op-
erate if a blocked dust filter prevent the flow of cooling
air through the machine.
The machine cannot be returned to operation until it has
cooled down to a lower temperature and the operation
of the protection has been reset with the main switch.
Take the following steps:
–
reset once with the main switch (I —> O —> I)
–
if the machine does not star, wait 10-20 minutes
until the cooling fan cools the machine.
–
after the cooling down period, a further resetting with
the main switch (I —> O —> I) restores the ma-
chine to welding conditions.
Main fuse of the machine (F1)
Isolate the plug of the machine from the mains supply
and wait at least 2 minutes before loosening the front
grate. (See page 4).
It is very important that it is replaced with a fuse of same
type and rating which is marked on collar of fusebox.
Damage caused by a wrong type fuse, is not covered by
the guarantee.
26
/ 1916130 / 9939
Control fuse (F2)
The Kempotig 50 unit receives its operating voltage from
connector on rear panel of the power source. As protec-
tion of auxiliary transformer of the power source there is
an 8 A slow-blow cartridge fuse beside the connector (see
page 4). The fuse is in safety voltage circuit (30 V AC). If
the failure of this fuse is apparent, some of the possible
causes are as follows:
–
damage intermediary cable (short circuit)
–
damage remote control unit or its cable.
MAINTENANCE
The amount of use and the working environment should
be taken into consideration when planning the frequen-
cy of maintenance of the Kempotig 50. Careful use and
preventive maintenance will help to ensure trouble-free
operation.
Cleaning of the dust filter
(see page 5)
The cleaning of the machine’s dust filter should be per-
formed at regular intervals, the regularity of which is de-
pendent upon the machine’s working environment.
The cleaning is recommended to be done at least once
every 3 months when the machine is in constant use.
Isolate the plug of the machine from the mains supply
and wait at least 2 minutes before removing the ma-
chine’s front grate cover. When the dust filter is removed,
live parts are exposed, where line AC and high voltage
DC are present.
The maintenance is performed as follows:
–
Remove the front grate of the machine (2 screws)
–
Remove the fastening screws holding the dust filter
(2 pc)
–
Wash the filter carefully with water and if necessary
a detergent based degreasing solvent can be add-
ed e.g. dish washing liquid.
Do not use inflammable liquids.
–
Check the condition of the filter. If for example the
aluminium filler material has come out from it’s sup-
port frame, or it is damaged in any other way, it has
to be replaced with a new one.
A damage filter can cause a short circuit or other
damage in live parts of the machine and serious
damage may result.
–
Refasten the dry filter in place.
The screws have to be fitted with locking plates.
–
Refasten the front grate to the machine
Regular maintenance
The major points it the maintenance procedure are list-
ed as follows:
–
cleaning of the machine
–
maintenance of the dust filter
–
checking of the connectors
–
checking of the switches and potentiometers
–
checking of the condition and mounting of the mains
cable and plug
–
checking and tightening of the connections inside
the machine
–
damage parts or parts in bad condition are replaced
by new ones
–
maintenance testing. Operation and performance
values of the machine are checked and adjusted
when necessary by means of test equipment.
In the case of operation disturbances, contact an au-
thorized KEMPPI Service Repair Shop. Check the main-
tenance parts before sending the machine to the serv-
ice shop.
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