Tweco 6000GST Merlin Plasma Cutting CE Slave Power Supply - Manual (Page 50)

CUSTOMER/OPERATOR SERVICE 5-4 Manual 0-2653
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. Gas pressure set too low at Gas Control Module
a. Adjust pressure
2. 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. Low plasma pressure
a. Check plasma pressure
2. Secondary supply turned OFF (or tank empty)
a. Check secondary supply
3. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
H. No coolant pressure at gauge; COOLANT Indica-
tor 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. Gas Control Module MODE switch not set to RUN
a. Normal operation, set switch to RUN position
2. Faulty torch switch, remote control, or remote pendant
a. Isolate and replace component(s) per Service
Manual.
3. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
M. Weak or sputtering pilot; HF stays on during pilot
1. Plasma gas pressure too high
a. Adjust pressure
2. Low OCV (normal 290-350 vdc) caused by improper
connection of voltage selection busbars
a. Check input voltage connections
3. Pilot Resistor out of adjustment
a. Adjust Pilot Resistor per Section 3.15