Fronius TP 1500, Service Manual

Page: 35 / 117

35
Error Cause Remedy
LEDs on LCA 15 board
at selected process „rod-
electrode welding“: “ISOLL”
is dark (LED brightness
depends on the pre-set
welding amperage)
Potentiometer is faulty Exchange the FPA 15 board
(see “Installation instructions
for FPA 15 board“)
Ribbon cable for FPA 15 board
is faulty Exchange the LCA 15 board
(see “Installation instructions
for LCA 15 board“); Then check
and set the maximum welding
amperage (see “Checking and
setting the maximum welding
amperage”)
Incorrect supply voltage Run the power source on the
correct mains voltage
If “SUPP” is still lit up: Check
the cables and plug-on con-
nections on the LCA 15 board;
inspect the shunt cables.
If “SUPP” is still lit up: Replace
t h e L C A 1 5 b o a r d ( s e e
“Installation instructions for
LCA 15 board”). Then check
and set the maximum welding
amperage (see “Checking and
setting the maximum welding
amperage”).
“SUPP” is lit up
LCA 15 board is faulty Replace the LCA15 board (see
“Installation instructions for
LCA 15 board”). Then check
and set the maximum welding
amperage (see “Checking and
setting the maximum welding
amperage”).
Secondary diode is faulty Replace the secondary diode
(see “Installation instructions
for LCG 15 board
LCG11 board is faulty Replace LCG15 board (see
“Installation instructions for
LCG 15 board and sec. diode”)
Welding-voltage measure-
ment is faulty (no signal on the
10-pole Molex plug X10, Pin
3) Check cables and plug-on
connections. If nec., replace
LCG15 board (see “Installation
instructions for LCG 15 board
and sec. diode”)
Malfunction indicator on
the operating panel of the
power source flashes
Heat-sink is dirty Blow the heat-sink clean with
dry, oil-free compressed air Malfunction indicator on
the operating panel of the
power source is lit up
Specified duty cycle is not
being reached - Fan is
running
Temperature sensor is faulty Replace temperature sensor
(see “Installation instructions
for temperature sensor”)
Fan is faulty Replace fan (see “Installation
instructions for fan”)
Fan is not running
No welding current
After the machine is
switched on, all indicators
are permanently lit up
(longer than 2 seconds)
Short-circuit (secondary side) Stop the short circuit (unplug
the electrode or earth cable
from the bayonet socket). If
the fault persists: Open up the
housing and check all cables
for insulation damage, and that
n o b a r e c o n d u c t o r s a r e
touching any parts of the
housing or each other.
Troubleshooting
table
(continued)