Kemppi KMS 300 User Manual download pdf (Page 9)

If changing the mains cable take into consideration the following:

The cable is entered into the machine through the inlet ring on the rear panel of the machine

and fastened with a cable clamp (05). The phase conductors of the cable are coupled to

connectors L1, L2 and L3. The earth protection coloured green-yellow is coupled to connector.

NOTE! If you are using 5-lead cable, do not connect neutral conductor.

Sizes of the mains cables and fuse ratings for the machine at 100 % duty cycle are specied in

the table below:

Rated voltage Mains voltage range Fuses, slow-blow Connection cable *) mm²

KMS 300 400 V 3~ 360 V – 440 V 20 A 4 x 6.0 S

KMS 400 400 V 3~ 360 V – 440 V 25 A 4 x 6.0 S

KMS 500 400 V 3~ 360 V – 440 V 35 A 4 x 6.0 S

*) In cables of S type there is a protective grounding conductor coloured green-yellow.

2.4 Welding and earth cables

Recommended copper cables with cross-sectional area are as follows:

FastMig KMS 300 50 – 70 mm²

FastMig KMS 400 70 – 90 mm²

FastMig KMS 500 70 – 90 mm²

In enclosed table are shown typical load capacities of rubber insulated copper cables, when

ambient temperature is 25 °C and lead temperature is 85 °C.

Cable Duty cycle ED Voltage loss / 10 m

100 % 60 % 30 %

50 mm² 285 A 370 A 520 A 0.35 V / 100 A

70 mm² 355 A 460 A 650 A 0.25 V / 100 A

95 mm² 430 A 560 A 790 A 0.18 V / 100 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.

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Kemppi KMS 300 User Manual Page 9