8 – KEMPOWELD 3200, 3200W / 0543
© KEMPPI OY
2.4.5. Adjustment for arc roughness
Arc roughness is adjusted by connecting the return current cable to the applicable one of the two dix-connectors
on the front plate.
The connector marked with shorter symbol gives a rougher arc, which is used for welding of thin sheets and ferrous
metals by 0.6 - 1.0 mm wires and especially with CO² shielding gas. The connector marked with longer symbol
is suitable for thicker wires and especially for aluminium and stainless materials. The most suitable roughness is,
however, most dependent on the welding case. You will find the best position by testing the different positions.
2.4.6. Operation of cooling fan
The cooling fan on the rear plate of the Kempoweld 3200 equipment is started and stopped according to use. The
cooling fan is controlled by the gun trigger and control circuits. The cooling fan is started after ca. 15 s after weld
start and stopped after ca. 10 min after weld end or release of the overheat protection.
Do not switch off the unit with the main switch before the cooling fan has automatically stopped.
By open circuit the cooling fan does not get started.
2.4.7. Accessory drawer
In the accessory drawer in the cover part of the unit are by delivery the plastic guide tubes needed for welding of
aluminium and stainless steels. In the drawer are also the screw and the insulation bushings needed for locking of
rotation of the wire feeder Kempoweld WIRE 400.
2.4.8. Adjustment for wire feed
The wire feed is adjusted from the potentiometer on the control panel of
the wire feeder unit Kempoweld WIRE 400. The adjustment has been
described in the operation instructions of the wire feeder unit.
2.5. VOLT / AMPERE METERING UNIT MSD-1
For the mounting of the MSD-1 remove the cover plate on the front panel of the unit. The connector of flat cable
fastened to the cover plate is connected to the corresponding connector of the MSD-1. From the metering unit you
can with lever switch select momentary display for either voltage or current. By open circuit only voltage value is
displayed, because there is no welding current present.
The voltage value is the voltage between the unit´s welding connectors or terminal voltage. The value of the open
circuit voltage has not very much importance for the welding, so that the display of the metering unit is adjusted
according to the welding situation. The display of the open circuit voltage differs 2-3 V from the true voltage.
During welding the terminal voltage is varying and the arc voltage differs from the terminal voltage due to cable
etc. losses. Accuracy of voltage true value in respect to real value is ±4,0 %, ±0,2 V by welding values according
to the norm.
Accuracy of current true value in respect to real value is ±2,5 %, ±2 A.
The metering unit does not show wire feed values.
The MSD-1 does not need any calibration in the Kempoweld power source.
The switch positions: V = voltage display, A = current display.
2.6. COOLING UNIT
Kempoweld 3200W power source has inbuilt cooling unit.
2.6.1. Installation of cooling
The cooling unit is connected to the gun by means of water hoses, which are mounted to the wire feeder unit. The
interconnection cable contains also the water hoses, which are mounted to the gun through the wire feeder unit
without any extension parts. See operation instruction for Kempoweld WIRE feeders.
Before connection check that in the hoses are no dirt, metal powder, rubber waste etc. The connectors for hoses
and cooling unit are marked with red or blue identification rings or spots. Blue is colour for water supplied from
cooling unit to gun and red is colour for water returning back from gun to cooling unit.
