07/02/1
1 M40CT_GB
PROBLEM
AS
SO
CI
AT
ED
SY
MP
TO
MS
POSSIBLE CAUSE
VERIFICA
TIONS
WHA
T T
O DO
P6
Lack
of
voltage
control
in
CV
mode
(applicable
to
the
CC-CV
machines
provided
with
filter
board)
The
open
circuit
voltage
in
CV
mode
is
the
same
as
for
the
CC
mode,
regardless
of
the control knob position
Failure
in
the
EMC
filter
board
on
the
welding
so
-
ckets
Check
by
means
of
a
multimeter
(stopped
machine)
the
resistence
value
between
positive
welding
socket
and
the
corresponding
faston
connector
on
the
filter
board.
The condition to check is: ohmic
value
between
+
welding
socket
and
+
board
faston
(the
one
to
which
the
red
cables are connected) < 4 ohm In case of condition not satisfied take the indicated corrective action.
Replace the EMC filter board
P7
No
welding
arc
(applicable
to
the
machines
provided
with
the
filter
board
on
the
welding
so
-
ckets)
The
open
circuit
voltage
is
zero
Failure
in
the
EMC
filter
board
on
the
welding
so
-
ckets
Check
by
means
of
a
multimeter
(stopped
machine)
the
resistence
value
between
positive
welding
socket
and
the
corresponding
faston
connector
on
the
filter
board.
The condition to check is: ohmic
value
between
- welding
socket
and
- board
faston
(the
one
to
which
the
black
cables are connected) < 4 ohm In case of condition not satisfied take the indicated corrective action.
Replace the EMC filter board
P8
Minimum
welding
current
in
CC
mode
too
high
(applicable
to
the
machines
provided
with
the
filter
board
on
the
welding sockets)
The
welding
current
in
CC
mode
with
the
knob
at
be
-
ginning
of
scale
is
too
high
and
changes
when
turning
the
arc
force
knob
(if
pre
-
sent,
switch
in
ON
position)
Failure
in
the
EMC
filter
board
on
the
welding
so
-
ckets
Check
by
means
of
a
multimeter
(stopped
machine)
the
resistence
value
between
positive
welding
socket
and
the
corresponding
faston
connector
on
the
filter
board.
The condition to check is: ohmic
value
between
+
welding
socket
and
+
board
faston
(the
one
to
which
the
red
cables are connected) < 4 ohm In case of condition not satisfied take the indicated corrective action.
Replace the EMC filter board
P9
Minimum
welding
current
in
CC
mode
too high
The
welding
current
in
CC
mode
with
the
knob
at
be
-
ginning
of
scale
is
too
high
and
changes
when
turning
the
arc
force
knob
(if
pre
-
sent,
switch
in
ON
position)
Cable
interruption
betwe
-
en
the
W
AC
or
the
wel
-
ding
control
board
(as
applicable
depending
on
the
machine
type)
and
the welding sockets
With
the
machine
stopped,
extract
the
connector
plugged
to
J1
of
the
W
AC
/ W
el-
ding
control
board
(as
applicable
depending
on
the
machine
type).
Check
by
means
of
a
multimeter
the
continuity
between
pin
6
of
the
connector
and
the
positive
wel
-
ding socket.
The resistive
value shall be < 4 ohm if there is a filter board behind the
sockets, otherwise shall be < 0.5 ohm. In case of condition not satisfied take the indicated corrective action.
Fix the cabling or replace it.
P10 No welding arc
The
open
circuit
voltage
is
zero
Cable
interruption
betwe
-
en
the
W
AC
or
the
wel
-
ding
control
board
(as
applicable
depending
on
the
machine
type)
and
the welding sockets
With
the
machine
stopped,
extract
the
connector
plugged
to
J1
of
the
W
AC
/ W
el-
ding
control
board
(as
applicable
depending
on
the
machine
type).
Check
by
means
of
a
multimeter
the
continuity
between
pin
5
of
the
connector
and
the
negative
wel
-
ding socket.
The resistive
value shall be < 4 ohm if there is a filter board behind the
sockets, otherwise shall be < 0.5 ohm. In case of condition not satisfied take the indicated corrective action
Fix the cabling or replace it.
CS
M
40.2
REV.0-02/11
Trouble shooting
