Tweco 1000 Merlin(Dec2004) - Manual (Page 50)

SERVICE 5-4 Manual 0-2708
Right Side
Cut Angle
Left Side
Cut Angle
A-00512
Figure 5-4 Side Characteristics Of Cut
E. Dross
Generally when dross is present on carbon steel, it is referred to
as either "high speed or slow speed dross".
"High speed dross" usually forms a narrow bead along the
bottom of the cut edge and is very difficult to remove. "Slow
speed dross" will be in larger quantities but does not adhere
tightly to the cut edge and can be easily removed.
When cutting a troublesome steel, it is suggested that the torch
travel speed be reduced to produce "slow speed dross". Any
required cleanup can then be done by scrapping, not grinding.
Dross present on top of the plate (top spatter), is normally
caused by a slow torch travel speed or too high of a torch
standoff distance.
5.05 Troubleshooting Guide
General
Troubleshooting and repairing this unit is a process which
should be undertaken only by those familiar with high
voltage high power electronic equipment.
WARNING
There are extremely dangerous voltage and power
levels present inside this unit. Do not attempt to
diagnose or repair unless you have had training in
power electronics measurement and troubleshoot-
ing techniques.
Basic Troubleshooting
This manual covers a basic level of troubleshooting that re-
quires limited disassembly and measurements. If major com-
plex subassemblies are faulty, the unit must be returned to an
authorized service center for repair.
Follow all instructions as listed and complete each section in
the order presented. For major troubleshooting and parts re-
placement procedures refer to Merlin 1000 Power Supply Ser-
vice Manual 0-2709.
How to Use This Guide
The following information is a guide to help the Customer/
Operator determine the most likely causes for various symp-
toms.
This guide is set up in the following manner:
X. Symptom (Bold Type)
Any Special Instructions (Text Type)
1. Cause (Italic Type)
a. Check/Remedy (Text Type)
Locate your symptom, check the causes (easiest listed first)
then remedies. Repair as needed being sure to verify that
unit is fully operational after any repairs.
A. AC Power Indicator OFF
1. Switch at customer's main power panel in OFF position.
a. Close main power panel switch
2. Input power not properly connected to customer's main
power panel
a. Check that input power is present and unit is
properly connected (refer to Section 3.05, In-
put Power Connections)
3. Actual input voltage does not correspond to voltage
selection inside unit
a. Check actual line voltage vs. voltage selection
(refer to Section 3.05)
4. Customer's main power line fuse(s) blown
a. Check main power panel fuse(s) and replace
as required.
5. Unit internal fuse blown or loose
a. If blown, double check input voltage vs. volt-
age selection (inside of unit) and replace fuse
per Section 5.07-B. If fuse blows again, return
unit to an authorized service center.
6. Faulty components in unit
a. Return for repair or have qualified technician repair
per Service Manual.