Kemppi Kempomig 4000R - Manual (Page 9)

8 KEMPOMIG 4000R, 4000WR - 0409 © COPYRIGHT KEMPPI OY KEMPOMIG 4000R, 4000WR - 0409 9 © COPYRIGHT KEMPPI OY
4.2.2. Operation
Operating control
The pump starts up automatically when you pull the gun trigger. The water post-circulation
continues ca. 5 - 7 min after weld end.
When the power source’s main switch is in O position all cooling unit functions are stopped!
Cooling unit´s fuse
The fuse 2 A, delayed, on the rear wall of the power source is the short-circuit protection of the
cooling unit’s auxiliary transformer. Use a fuse size and type according to markings. If the fuse is
blown again, send the unit to service.
Selecting switch for gun´s cooling mode
- position: for air-cooled MIG gun.
- position: for water-cooled MIG gun. The pump starts up, when you pull the gun
trigger.
N
ote! If you have selected - position but you are using a water-cooled gun, welding
is started by pulling the gun trigger. However, the pump will not get started. This kind
of wrong selection will destroy the gun in short time!
Test switch
With the TEST switch on the cooling unit panel you can circulate water without starting welding.
This is used for filling the gun and interconnection cable with cooling water before starting welding.
In disturbance situations you can always test the water circulation. Always check entry of return
water into the tank before welding.
Signal lamp for overheating
If the cooling water in the tank is overheating, the thermal protection will stop the power source.
Cooling unit operation continues automatically ca. 5 - 7 min. After the cooling water has cooled
down sufficiently, the signal lamp will switch off, and you can start welding as usual.
Signal lamp for lacking water pressure
If the pump does not step up sufficient supply pressure, e.g. when the water is running out or in
disturbances in the pump the whole equipment will stop after ca. 5 s and the red signal lamp is lit.
Check the equipment as upon installation. See chapter for Operation disturbances.
4.2.3. Operation disturbances of the cooling unit
If operation or functional disturbances occur, take measures according to the following list.
If the disturbance cannot be eliminated, take contact with an authorised Kemppi repair
workshop.
The pump does not get started when pressing the TEST switch:
– check the fuse 2 A, DELAYED, on the rear of the cooling unit
– check position for cooling mode selecting switch
– check position for main switch
The water is pumping but does not return back to the tank or the return flow is weak:
– filling of interconnection cable can take several minutes
– if you have lifted the gun or interconnection cable for the filling time several meters higher
than the power source, filling will take place considerably slower. Fill the hoses on the floor
position.
– if there is a leakage in the interconnection cable, check the whole flowing line
The water is pumping, but during welding the red signal lamp for water pressure is lit and
the equipment is stopped:
– check the cooling water volume and return flow to the tank
– there are air bubbles or leakages in the system
– pressure switch set value (ca. 1 bar) is unsuitable for the gun being used
During welding the yellow signal lamp for overheating is lit and the equipment is
stopped:
– release the trigger and let the water cool down. When the lamp is switched off, the operation
has been reset automatically
– check if the gun is suitable for power being used