Power Source Problems - Firepower FP 95 Operating Manual

SERVICE

5.05 Power Source Problems

FAULT
1 Primary line voltage is ON.
Welding arc can not be
established.
2 Primary line voltage is ON
but when the MIG Gun
trigger switch is depressed
nothing happens.
3 Primary line voltage is ON,
no wire feed but gas flows
from the MIG Gun when
the torch trigger switch is
depressed.
4 Wire feeds when the MIG
Gun trigger switch is de-
pressed but arc can not be
established.
5 Jerky wire feed
Thermal Overtemp Light
6
is ON and Fan motor is
running
Thermal Overtemp Light
7
turns on in less than 30
seconds during welding.
Service
CAUSE
A Primary fuse is blown.
B Broken connection in primary
circuit.
MIG Gun trigger switch leads are
disconnected.
A Electrode wire stuck in wire liner
or contact tip (burn-back jam).
B Faulty control PCB
Poor or no work lead connection.
A Worn or dirty contact tip
B Worn feed roller.
C Excessive back tension from
wire reel hub.
D Worn, kinked or dirty conduit
liner
The machine duty cycle has
been exceeded.
Fan has stopped running or fuse
on PCB has blown
Table 5-2: Power Source Problems
REMEDY
A Replace primary fuse.
B Have an Accredited ESAB Service Agent check primary circuit.
Reconnect.
A Check for clogged / kinked MIG Gun wire liner or worn contact
tip. Replace faulty component(s).
B Have an Accredited ESAB Service Agent investigate the fault.
Clean work clamp area and ensure good electrical contact.
A Replace
B Replace
C Reduce brake tension on spool hub
D Clean or replace conduit liner
Allow the fan to run so machine can cool down. When light
goes out, welding may resume.
Have an Accredited ESAB Service Agent replace the fuse.
5-3
FIREPOWER FP 95 FC
Manual 0-5122