Machine use – Kemppi KM 400 MVU User Manual

Page 8

2.4

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-

surfaces of the cables are as follows:

Model

Cross-surface

KM 400

70 … 90 mm²

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

Duty cycle (ED)

Voltage loss / 10 m

100 %

60 %

35 %

20 %

50 mm²

285 A

316 A

371 A

458 A

0,35 V / 100 A

70 mm²

355 A

403 A

482 A

602 A

0,25 V / 100 A

95 mm²

430 A

498 A

606 A

765 A

0,18 V / 100 A

120 mm²

500 A

587 A

721 A

917 A

0,21 V / 100 A

NOTE!

Do not overload the welding cables, as an overload may cause voltage loss and

overheating.
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.

MACHINE USE

3.1

STARTING OF THE POWER SOURCE

Start the power source by turning the main switch (S11) on the front panel to the ‘I’ position.

The standby indicator (H11) turns on. The control panel and wire feeder are not operational

yet, and the text ‘OFF’ is shown on the control panel display.

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

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

the temperature of the machine.

3.2

FRONT PANEL INDICATORS

The following indicators can be found on the front panel of the device:

• When the green indicator, H11, is on, the power source is in standby mode. This indicator

is on when the machine is connected to the mains supply with the main switch in the ‘I’

position.

• When the yellow overheating indicator (H12) is on, the machine has overheated. The fan

then starts. When the indicator turns off, the machine can be used again.

• When indicator H12 blinks, the machine has experienced a failure. Attempt to remedy

the problem according to the instructions in Section 4, ‘Troubleshooting’. If the failure

cannot be eliminated, turn off the machine, and turn it on again. If the failure persists,

write down any fault code that may be shown on the display and contact authorised

Kemppi service agent.

FastM

y / 1045