Welding And Earthing Cables; Machine Use; Starting Of The Power Source - Kemppi FastMig KM300 Operating Manual

The table below lists the fuse sizes for 100% load in a 400-V three-phase network with
4 x 10-mm² cable for different power source models.
Model
KM 300
KM 400
KM 500
2.3

WelDing anD earthing Cables

The device has a welding cable connection both in the front and in the rear. The positions of
the welding and earthing cable connections are shown earlier in section 'Introduction' .
The welding cable type to be used is rubber-insulated copper cable. The recommended cross-
sections of the cables for different power source models are as follows:
Model
KM 300
KM 400
KM 500
The table below shows the typical load capacities of the cables when the ambient
temperature is 25 °C and the lead temperature is 85 °C.
Cable
50 mm²
70 mm²
95 mm²
120 mm²
NOTE!
Do not overload the welding cables, as an overload may cause voltage loss and
overheating.
FI
Connect the earth clamp directly to the work piece in such a way as to maximise the contact
surface of the clamp. The point of connection must be unpainted and free of corrosion.
SV
3.

MaChine use

NO
3.1

starting OF the pOWer sOurCe

DA
Start the power source by turning the main switch (A2) on the front panel to the 'I' position.
EN EN
The standby indicator (A3) turns on. The control panel and wire feeder are not operational yet,
and the text 'OFF' is shown on the control panel display.
DE
NOTE! Always turn the device on and off using the main switch, not via the mains socket.
The cooling fan is started for a moment when the main switch is turned to the 'I' position. The
NL
fan turns off after a while and then restarts during welding when the machine has warmed up
sufficiently. The fan continues running even after up to 10 minutes of welding, depending on
FR the temperature of the machine.
ES
PL
RU
8
Fuse
20 A delayed
25 A delayed
35 A delayed
Cross-section
50...70 mm²
70...90 mm²
70...90 mm²
Duty cycle (ED)
100 % 60 % 35 %
285 A 316 A 371 A
355 A 403 A 482 A
430 A 498 A 606 A
500 A 587 A 721 A
Voltage loss / 10 m
20 %
458 A 0,35 V / 100 A
602 A 0,25 V / 100 A
765 A 0,18 V / 100 A
917 A 0,21 V / 100 A