ESAB Arc 4000i Service Manual page 52

Code Description
4 5 V power supply too low
The unregulated power supply voltage is too low: the smoothing capacitors cannot keep the
voltage up enough for the processor to continue to operate. The processor stops all normal
activities, expecting to be shut down.
Action: Turn off the mains power supply to reset the unit. If the fault persists, check the
power supply to circuit board 20AP1.
5 Intermediate DC voltage outside limits
The DC voltage from the main rectifier, 15BR1, is too high or too low.
Too high a voltage can be due to severe transients on the mains power supply or to a weak
power supply (high inductance of the supply).
The power source is stopped immediately, and cannot be restarted until the voltage has
returned to within the limit values.
Action:
Turn off the mains power supply to reset the unit. See also section 15AP1:3 on page 27 and
section 15AP2:2 on page 30.
6 High temperature
Thermal overload cutout 15ST1 or 15ST2 has operated. The power source is stopped, and
cannot be restarted until the cutout has reset.
Possible causes: Overloading, fan not working properly, cooling air inlets or outlets blocked
or obstructed or dirt on the heat exchanger.
8 +15 V power supply on circuit board 20AP1
The voltage is too high or too low: it must be within the range 14.1 to 15.9 V. This fault does
not disable any functions.
9 - -15 V power supply on circuit board 20AP1
The voltage is too high or too low: it must be within the range --14.2 to --16.4 V. This fault
does not disable any functions.
10 +24 V power supply on circuit board 20AP1
The voltage is too high or too low: it must be within the range 22.1 to 26.0 V. For sofware
version 2.46Q and 2.46R the upper limit is 24.8 V, for later versions the limit is 26.0 V.
12 Communication error (warning)
The load on the system CAN bus is temporarily too high, or there is electric noise on the
bus.
Action: Check the equipment to ensure that only one wire feed unit and/or remote control
unit is connected. See also section 20AP1:3 'The CAN bus' on pages 34 to 36.
15 Lost messages
The bus CAN controller indicates that a message has been lost. No functions are disabled
by this fault.
Action: Check that all units are correctly connected to the CAN bus. See also section
20AP1:3 'The CAN bus' on pages 34 to 36.
16 High open- -circuit voltage
The open--circuit voltage has exceeded 113 V for more than one second. The power source
is turned off and cannot be restarted. Turn off the mains power supply to reset the unit.
Action: Turn off the mains power supply to reset the unit.
cu20f1
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S0740 800 191/E080229/P78