Tweco 3000 Merlin - Manual (Page 48)

SERVICE 5-4 Manual 0-2532
D. TEMP indicator ON (red).
1. Unit overheated
a. Clean radiator and check for obstruction
b. Check for adequate air flow around unit
2. Faulty power supply
a. Isolate and replace component(s) per Service
Manual
E. GAS indicator OFF
1. RUN/SET/PURGE switch set to PURGE, second-
ary mode switch set to GAS secondary
a. Normal operation (purges plasma line only,
secondary flow switch is not satisfied)
2. Gas pressure set too low
a. Adjust pressure
3. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
F. GAS indicator OFF, plasma and/or secondary
gas does not flow
1. RUN/SET/PURGE switch set to PURGE, second-
ary mode switch set to GAS secondary
a. Normal operation (purges plasma line only,
secondary does not flow)
2. Secondary mode set to O2
a. No secondary flow is normal operation in O2
mode (but GAS indicator should be ON)
3. Low plasma pressure
a. Check plasma pressure
4. Secondary supply turned OFF (or tank empty)
a. Check secondary supply
5. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
H. No coolant pressure at gauge; COOLANT
Indicator may be OFF or ON
1. Coolant level is too low
a. Check coolant level in Coolant Reservoir and
add if necessary.
2. Clogged Coolant Filter Assembly (Rear Panel)
a. Remove screen from filter and clean or replace
as necessary.
3. Clogged In-Line Coolant Filter Assembly (Behind
Side Panels)
a. Remove screen from filter and clean or replace
as necessary.
4. Plugged or damaged coolant hoses
a. Inspect all coolant hoses and clean or replace
as necessary.
5. Plugged or damaged torch head
a. Inspect all torch head parts and replace as nec-
essary.
6. Defective Coolant Flow Component(s)
a. Isolate and replace component(s) per Service
Manual.
I. COOLANT indicator flashing ON and OFF
1. Air in coolant lines
a. Run pump for ten minutes to purge air from
the coolant lines before using the system.
2. Coolant Level is low
a. Check for proper coolant level at rear panel
gauge
J . Coolant CONDUCTIVITY Indicator OFF
1. Coolant conductivity is excessive.
a. Drain and replace coolant. Also check the con-
dition of the deionizer bag in the reservoir bas-
ket, if the bag is yellowish brown (straw color)
replace the bag.
2. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
K. Leaking torch connection
1. Loose torch connection
a. Check connection making sure connector is
fully seated.
L. DC indicator OFF (after pre-flow); No main
contactor closure
1. RUN/SET/PURGE switch not set to RUN
a. Normal operation, set switch to RUN position
2. Faulty torch switch, remote control, or remote pen-
dant
a. Isolate and replace component(s) per Service
Manual.