Kemppi KM 400 MVU User Manual

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4.3

ELECTRIC NETWORK OVERVOLTAGE OR UNDERVOLTAGE

If the power source is used in an electric network with insufficient voltage (less than 300 V),

the control features of the device are disabled automatically.
The primary circuits of the power source are protected against power spikes. The product’s

mains voltage range is broad enough to prevent overvoltage problems at up to 440 V (see

Section 8, ‘Technical specifications’). Make sure that the voltage remains within the allowed

range, especially if the operating power is supplied by a generator set.

4.4

MISSING PHASE IN THE ELECTRIC NETWORK

If a phase is missing from the mains current, the welding features will be adversely affected or

the machine may have problems starting. Loss of a phase can be caused by a:

• Blown mains fuse.

• Damaged mains cable.

• Poor mains cable connection in the machine’s terminal block or mains socket.

4.5

MACHINE ERROR CODES

The machine always checks its operation automatically during start-up and reports any

failures detected. If failures are detected during start-up, they are shown as error codes on the

control panel display.

Power source error codes
Err3

Power source overvoltage

The machine has stopped the welding because it has detected momentary voltage spikes or

continuous overvoltage dangerous to the machine in the electric network. Check the quality

of the network supply.

Err4

Power source overheating

The power source has overheated. The cause might be one of the following:

• The power source has been used for a long time at maximum power.

• The circulation of cooling air to the power source is blocked.

• The cooling system has experienced a failure.

Remove any obstacle to air circulation, and wait until the power source fan has cooled down

the machine.

Err5

Water unit alarm

The water circulation is blocked. The cause may be one of the following:

• Congestion or disconnection in the cooling pipeline.

• Insufficient cooling liquid.

• Excessive cooling liquid temperature.

Check the circulation of the cooling liquid and the air circulation of the water unit.

Err23 Power source overvoltage warning

The power source has detected voltage spikes in the electric network. Short power spikes

can be managed. They do not lead to interruptions in welding but may decrease the welding

quality. Check the quality of the supply network.

Err61 The water unit is not found

The water unit is not connected to the equipment, or the connection has failed.
Set the machine to gas cooling (3.3.7) if you are using a gas-cooled welding gun, or connect a

water unit.

Err155 Warning of the wire feed unit overheating

The voltage level of the wire feeding engine has increased. The cause may be a stained wire

lead or a gun cable that is twisted at a sharp angle. Check the state of the gun, and clean the

wire line if this is necessary.

FastM

y / 1045