CD 2301 Order No. BA 92-12-0231A Issue 05.01.10 35
5.9 Malfunctions and Corrective Actions
Malfunction Possible cause Fault finding Corrective action Carried out by
Light signal of
primary sw itch does
not light
Primary outlet defective Check primary outlet *) Replace primary outlet *) Qualified personnel
Primary cable broken Check primary cable *) Replace primary cable *) Qualified personnel
No LED display at the
front
Fuse F4 10 AT defective Check primary fuse Replace primary f use F4 on
the front plate of the pow er
unit
Instructed personnel
Leads interrupted Check leads *) Replace leads *) Qualified personnel
No display No ground connection Check ground connection on
w orkpiece
Tighten ground connection
properly
Instructed personnel
Gun not connected Check gun connection Connect gun properly Instructed personnel
Transition resistance
(betw een stud and
w orkpiece) too high
Check material surface Clean or grind material
surface
Instructed personnel
Ground cable broken Check ground cable *) Replace ground cable *) Qualified personnel
Welding gun cable
broken
Check w elding gun cable *) Replace w elding gun cable *) Qualif ied personnel
No display Defective connecting
line of w elding gun
Check function of
connecting line *)
Replace connecting line *) Qualified personnel
Welding gun trigger
button defective
Check control cable for
electrical flow w ith triggered
start button *)
Replace w elding gun trigger
button *)
Qualified personnel
Control cable broken Check control cable for
electrical flow *)
Replace control cable *) Qualif ied personnel
Continuously red
display: rEL
Discharge relay
defective
Sw itch off pow er unit; then
sw itch on after some
seconds; if the pow er unit is
still locked, sw itc h of f the
pow er unit - inform the
reponsible service
department
If no mentioned actions are
successful, please contact
our service department
Instructed personnel
Continuously red
display: SCr
Main thyristor or control
defective
Sw itch off pow er unit; then
sw itch on after some
seconds; if the pow er unit is
still locked, sw itc h of f the
pow er unit - inform the
reponsible service
department
If no mentioned actions are
successful, please contact
our service department
Instructed personnel
Continuously red
display: L ... F
Charging error Wait w ith sw itched on
pow er unit until the
transf ormer has cooled
dow n. If the pow er unit then
still display s L ... F, inform
the responsible service
department
If no mentioned actions are
successful, please contact
our service department
Instructed personnel
Continuously red
display: F ... 4
Arrow keys sticking Check arrow keys Press arrow keys Instructed personnel
Continuously red
display: F ... 2
Welding sequence too
fast
Let sw itched on pow er unit
cool dow n
Pow er unit resets
automatic ally
Instructed personnel
Gun does not lift, in
spite of ,
and
No lift adjusted Check settings of w elding
gun
Modify set parameters Instructed personnel
Short circuit of solenoid
circuit of the gun
Check resistance value at
control cable (18
to 22
)
betw een Pin 1 and Pin 2 *)
Replace control cable, control
line, solenoid *)
Qualified personnel
S
ol
enoid
def
ec
tive Check solenoid (18
to
22
) *)
Replace solenoid *) Qualified personnel
No display Solenoid circuit
interrupted
Check resistance value at
control cable (18
Ω
to 22
)
betw een Pin 1 and Pin 2 *)
Replace solenoid or control
line *)
Qualified personnel
Actions marked with *) must only be carried out by qualified
electricians!
If none of the actions is successful, please contact our service
department.
5 Stud Welding Procedure
5.9 Malfunctions and Corrective Actions
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