Tweco 1000 CE Merlin - Manuel (Page 48)

SERVICE 5-4 Manual 0-2731
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
requires limited disassembly and measurements. If major
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 Merlin 1000
Power Supply Service Manual 0-2732.
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 indicator 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 3.04, In-
put Power Connections)
3. Customer's main power line fuse(s) blown
a. Check main power panel fuse(s) and replace as re-
quired.
4. Unit internal fuse blown or loose
a. If blown, double check input voltage vs. voltage
selection (inside of unit) and replace fuse per
Section 5.07-B. If fuse blows again, return unit
to an authorized service center.
5. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
B. AC Power indicator ON; TEMP indicator ON
1. Airflow obstructed
a. Check for obstructed air flow and correct condi-
tion.
2. Fan(s) blocked
a. Check and correct condition
3. Unit is overheated
a. Allow unit to cool down for about 5 minutes.
Make sure the unit has not been operated be-
yond duty cycle limit.
4. Input line voltage is low
a. Check and connect to proper input power line
5. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
C. Torch will not pilot when torch switch is activated
1. RUN/SET switch in SET position
a. Move switch to RUN position.
2. Start signal activated during 8 second power on time
a. Remove Start signal and wait until AC indica-
tor stops flashing before sending Start signal