Tweco Merlin 6000GST Master PS - Manual (Page 51)

Manual 0-2652 5-3 CUSTOMER/OPERATOR SERVICE
5. Poor Pilot Starting
a. Non-Genuine Thermal Dynamics Parts
b. High coolant conductivity
5.04 Troubleshooting
General
Troubleshooting and repairing the 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. It is
helpful for solving many of the common problems that
can arise with a plasma cutting system.
NOTE
For major troubleshooting and parts replacement
procedures refer to Power Supply Service Manual
0-2569.
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 of the troubleshooting guide in the order presented.
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.
Troubleshooting Specific Problems
A. Main disconnect fuse blows when primary power
is connected
1. Voltage selection busbars connected incorrectly
a. Check and correct if necessary.
2. One leg of three-phase primary connected to chassis
ground
a. Rewire input cable
3. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
B. AC Power Indicator on Front Panel not ON; Fan
and pump OFF
1. Customer’s main power disconnect is turned OFF
a. Turn ON main power disconnect
2. Front Panel ON/OFF switch is turned OFF
a. Turn ON front panel power switch
3. No primary power
a. Check for proper three-phase power at input
terminal board
4. Blown fuse (F2)
a. Check and replace fuse if necessary
5. Faulty power supply
a. Isolate and replace component(s) per Service
Manual.
C. AC power indicator ON; Fan and pump OFF
1. Remote Control or TB2 Enable switch not ON
a. Turn ON switch or enable signal at TB2
2. Primary power - missing phase
a. Check for proper three-phase power at input
terminal board
3. Blown fuse (F1 or F2)
a. Check and replace fuse if necessary
4. Power Supply Parallel Cable not installed and Fan in
Slave Power Supply is not ON
a. Connect cable between Master and Slave
Power Supplies
5. Faulty power supply
a. Isolate and replace component(s) per Service
Manual