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Sizes of the mains cables and fuse ratings for the KMS 400 MVU machine at 100 % duty cycle
are specified in the table below:
Rated voltage
400 v 3~
230 v 3~
*) In cables of S type there is a protective grounding conductor coloured green-yellow.
2.3. wELdING ANd EARTh CAbLES
Recommended copper cables with cross-sectional area are as follows:
FastMig™ KMS 400 MVU
In enclosed table are shown typical load capacities of rubber insulated copper cables, when ambient
temperature is 25 ºC and lead temperature is 85 ºC.
Cable
duty cycle Ed
100 %
50 mm²
285 a
70 mm²
355 a
95 mm²
430 a
Do not overload welding cables due to voltage losses and heating.
Fasten the earth clamp of the return current cable carefully, preferably direct onto the piece to be
welded. The contact surface of the earth clamp should always be as large as possible.
Clean the fastening surface from paint and rust.
3. OPERATION CONTROL SwITChES ANd
POTENTIOmETERS ANd ThEIR uSE
3.1. mAIN SwITCh I/O
When you turn the switch into I-position, pilot lamp H11 on the front face is illuminated and the
machine is ready for use.
Always turn the machine on and off with the mains switch, never use the mains plugs
as a switch.
3.2. PILOT LAmPS
The pilot lamps of the machine report the electric operation:
The green pilot lamp H11 when lit indicates that the machine is on and ready for use and it is
connected to the mains supply with the main switch in the I-position.
H12 indicates when lit that the thermal protection of the machine has been activated due to over
heating. The cooling fan will continue to run and cool the machine down and when the lamp is
off the machine is ready to weld.
3.3. OPERATION OF COOLING FAN
In FastMig™ -power sources there are two simultaneously operating fans.
– The fan is started for a moment when main switch is placed into position I.
– The fan will start during welding as the machine heats up and it will run for 1 to 10 minutes
after the welding has stopped.
© Kemppi oy
Fuses, slow-blow
35 a
50 a
70 ... 90 mm²
60 %
30 %
370 a
520 a
460 a
650 a
560 a
790 a
Connection cable *) mm²
h07rn-f 4g10 (10 mm²)
h07rn-f 4g10 (10 mm²)
Voltage loss / 10 m
0,35 v / 100 a
0,25 v / 100 a
0,18 v / 100 a
Fastmig™ Kms 400 mVU / 0647 – 7
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