CHOWEL WELCOM-250Y, Maintenance Manual

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WELCOM-250Y, Z MAINTENANCE MANUAL
CHOWEL
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. E31 SCR SHORT
This fault is checked for always while welding is not active, and
alarmed immediately, if any.
This fault indicates that the thyristor came to be short circuited.
Replaced the thyristor and check whether the weld current is
above the rated current or not.
. E40 SECONDARY CABLE BREAK
This fault is checked for when the welding ends, and alarmed at the end of the sequence.
This fault indicates that the disconnection of the secondary cable is imminent.
The imminent disconnection is predicted based on the probability.
Before replacing the secondary cable.
Check the impedance again for the reconfirmation purpose.
. E41 SECONDARY CABLE BREAK
This fault is checked for when the secondary cable short circuit test is made,
and alarmed immediately, if any.
This fault indicates that the secondary cable is short circuited or almost short circuited.
Replace the secondary cable.
. E50 SCR OVER TEMPERATURE
This fault is checked for at the initiation, and alarmed
immediately, if any.
This fault indicates that the thyristor or the weld transformer is over temperature.
Check the duty factor and the temperature and flow of the coolant.
. E60 EXTREMELY LOW CURRENT
This fault is checked for during the weld current control ends,
and alarmed when the sequence ends.
This fault indicates that the weld current was excessively small.
Check the weld cable for disconnection the weld and the electrode for dirt.
. E61 LOW CURRENT
This fault is checked for during the weld current control ends,
and alarmed when the sequence ends.
This fault indicates that the weld current was below the low current limit level.
Check the weld cable for disconnection the weld and the electrode for dirt.