Troubleshooting - ESAB ESP-50 Instruction Manual

sectIon 6
WarnInG
electrIc shocK can KIll! be
sure that all primary power to
the machine has been exter-
nally disconnected. open the
line (wall) disconnect switch or
circuit breaker before attempt-
ing inspection or work inside of
the power source.
WarnInG
Voltages in plasma cutting
equipment are high enough to
cause serious injury or possibly
death. be particularly careful
around equipment when the
covers are removed.
6.1

troubleshootInG

Check the problem against the symptoms in the following troubleshooting guide.
The remedy may be quite simple. If the cause cannot be quickly located, shut off
the input power, open up the unit, and perform a simple visual inspection of all the
components and wiring. Check for secure terminal connections, loose or burned
wiring or components, bulged or leaking capacitors, or any other sign of damage
or discoloration.
The cause of control malfunctions can be found by referring to the sequence of
operations and electrical schematic diagram (Figure 5-1) and checking the various
components. A volt-ohmmeter will be necessary for some of these checks.
NOTE: Before checking voltages in the circuit, disconnect the power from the high
frequency generator to avoid damaging your voltmeter.
6.2 troubleshootInG GuIde
a. power light (pl1) does not come on.
1. Visually inspect the machine for any damage.
2. check if the cooling fan is running. If not, then check the following :
a. check if the machine power cord is plugged to the input power
receptacle.
b. measure the input power at the receptacle. If not present, then
check the wall disconnect switch and it's fuses.
c. check Fuse (F1). If fuse is ok, then check the input switch (s1) for
proper operation. replace if defective.
3. If above items check oK , the problem is internal. send unit to an au-
thorized repair station for repair.
a. If the cooling fan is running, then measure voltage between
pins p2-11 and p2-14 of the control board (should be 115 Vac).
If there is no voltage, then replace transformer t2.
b. If the voltage is present, then the pilot light may be burnt
out.
b. Fault light remains on at power-up.
1. Verify start signal is not present. If so, clear start signal, fault should
reset.
2. Switch power to OFF, verify consumables are installed correctly.
c. no air Flow
1. check air inlet supply. unit requires 250 cFh (118 l/m) at 60 psig 4.1
bars).
2. check air hose and connections. tighten if leaking.
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troubleshootInG