8 – KEMPPI WELDFORCE KPS3500 / 0520
© KEMPPI OY
Sizes of the mains cables and fuse ratings for the machine at 100 % duty cycle are specified in
the table below:
*) 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 is 50...70 mm² (1/0...2/0 AWG) in Kemppi
WeldForce KPS 3500.
In enclosed table are shown typical load capacities of rubber insulated copper cables, when ambient
temperature is 25 ºC (77 ºF) and lead temperature is 85ºC (185 ºF).
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.
Rated voltage Mains voltage
range
Fuses,
slow-blow
Connection cable *)
mm² (AWG)
KPS3500 480 V 3~ 430 V… 530 V 25 A 4 x 6.0 (10) S
CABLE DUTY CYCLE ED VOLTAGE LOSS/
10 m (32.8 ft)
100% 60% 30%
50 mm² (1/0 AWG)
285 A 370 A 520 A 0,35 V / 100 A
70 mm² (2/0 AWG)
355 A 460 A 650 A 0,25 V / 100 A
95 mm² (3/0 AWG)
430 A 560 A 790 A 0,18 V / 100 A
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