Tweco PAK Master 150XL - Manual (Page 40)

CUSTOMER/OPERATOR SERVICE 5-4 Manual 0-2864
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 re-
ferred 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 re-
moved.
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 scrap-
ping, 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
A. 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.
B. Basic Troubleshooting
This manual covers a basic level of troubleshooting that
requires limited dissasembly and measurements. If ma-
jor complex subassemblies are faulty, the unit must be
returned to an authorized service center for repair.
Follow all instructions as listed and complete each sec-
tion in the order presented. For major troubleshooting
and parts replacement procedures refer to PAK Master
150XL Power Supply Service Manual 0-2697.
C. How to Use This Guide
The following information is a guide to help the Cus-
tomer/Operator determine the most likely causes for
various symptoms.
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 LED OFF
1. Switch at customer's main power panel in OFF posi-
tion.
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
(inside of unit)
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 subsection 5.06-C. If fuse blows again, re-
turn unit to an authorized service center.
6. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.