5 connection to the mains supply, 6 welding and earth cables – Kemppi KMS 400 AS User Manual

Page 9

2.5 Connection to the mains supply

FastMig power sources are delivered as standard with 5 meters of mains power cable. No

mains plug is fitted at the Kemppi factory.

NOTE!

If local country based regulations state an alternative power cable is required, the mains

cable must be replaced in conformity with the regulations. Connection and installation of the

mains cable and plug, should only be carried out by a suitably qualified person.

Remove the machine cover plate to enable mounting of a mains cable. FastMig Pulse power

sources can be connected to the mains supply of 400 V 3~ .
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. The phase conductors of the cable are coupled to connectors

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

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

Sizes of the mains cables and fuse ratings for the machine at 100 % duty cycle are specified 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.

2.6 Welding and earth cables

Recommended copper cables with cross-sectional area are as follows:
FastMig KMS 400 AS

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.