ESAB ESP-150 Manual De Instrucciones página 28

SecTION 4 OPeRaTION
The status lights located on the front of the top lid of the ESP-150 console provide
the conditions of the circuitry during a normal plasma arc cutting operation . By
knowing the proper sequencing of events and by observing the status lights one
can troubleshoot the console in a short time to minimize downtime .
None of these lights will function unless proper input voltage is applied with the
links on the input terminal board (TB) properly connected for the input voltage; the
ON-OFF power switch is ON; and the top lid of the console is closed firmly .
The following are the functions of each light:
POWeR (ROS) — Energizes power to the Fan, Water Cooler and Control Circuitry .
This readies the unit for operation .
gaS MODe (OSS) — CUT - Allows for setup of cut gas pressure and flow; START/
SHIELD - allows setup of start and shield gas pressure and flow; and OPERATE - posi-
tion to use for cutting operations .
cuRReNT cONTROl — Controls desired cutting current for optimizing speed and
cut thickness . See Section 4 .6 Cut Data .
OVeR TeMP — Will light if any (one or more) thermal switch in the console is open
due to overheating . (This light may be dim when the gas flow is in the post-flow
mode .) If light comes on, stop cutting operations and allow unit to cool down (with
fan running) until light goes out . If the light is on and you suspect the unit is cool,
then check for defective thermal switch(es) or loose connections .
ReaDY/lOW gaS — This light serves as a READY light, torch switch and operate/
set switch check as well as low gas flow or pressure indicator . It will light when the
unit is at rest or READY (power ON-OFF switch is ON . It will continue to be lit when
operate/set switch (OSS) is placed in the SET position even when proper gas flow or
pressure is set properly . The light will not go out when the OSS switch is placed in
the OPERATE position (gas solenoid valves will shut off ) .
In the operate mode, this light will then function as a LOW GAS light . After depress-
ing the torch switch button and the LOW GAS lights up during a cutting operation,
gas pressure or flow is insufficient .
hIgh fReQ eNeRgIZeD — This will light when the unit is in the OPERATE mode
and the torch switch button is depressed . It should remain lit until the main cutting
arc is established . It indicates that proper voltage (approx . 115 VAC) is applied to the
primary of the high frequency transformer (HFTR) . The voltage is applied to the HFTR
through proper operation of the pilot arc contactor (PAC) .
TORch ON —
This will light when the power supply is delivering the voltage to
generate an arc (whether or not the main arc has been established) . It is indicating
there is greater than 50 volts between NEG output and WORK terminals . Never touch
the front end parts or make any adjustments to the torch if the TORch ON light
is on, even when the power ON-Off is Off.
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