Welding And Earth Cables; Operation Control Switches And Potentiometers And Their Use; Main Switch I/O; Pilot Lamps - Kemppi WeldForce KPS 3500 MVU Operation Instructions Manual

Sizes of the mains cables and fuse ratings for the machine at 100 % duty cycle are specified in
the table below:
Rated voltage
KPs3500 400 v 3~
KPs4500 400 v 3~
KPs5500 400 v 3~
KPs3500mvu 400 v 3~ 230 v 3~
KPs4500mvu 400 v 3~ 230 v 3~
KPs5500mvu 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:
Kemppi WeldForce KPS3500
Kemppi WeldForce KPS4500
Kemppi WeldForce KPS5500
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.
© Kemppi oy Kemppi WeldForce KpS3500, KpS4500, KpS5500, KpS3500mVU, KpS4500mVU, 5500KpSmVU / 0606 – 
mains voltage range
360 v... 440 v
360 v... 440 v
360 v... 440 v
360 v... 440 v 200 v... 260 v
360 v... 440 v 200 v... 260 v
360 v... 440 v 200 v... 260 v
50 ... 70 mm²
70 ... 90 mm²
70 ... 90 mm²
60 % 30 %
370 a 520 a
460 a 650 a
560 a 790 a
Fuses, Connection
slow-blow cable *) mm²
25 a 4 x 6.0 s
35 a 4 x 6.0 s
35 a 4 x 6.0 s
35 a 4 x 6.0 s
50 a 4 x10 s
60 a 4 x 16 s
Voltage loss / 10 m
0,35 v / 100 a
0,25 v / 100 a
0,18 v / 100 a