Tweco 1000 Merlin(Sept1999) - Manual (Page 43)

Manual 0-2731 39 SERVICE
4. Unit internal fuse blown or loose
a. If blown, double check input voltage vs. volt-
age selection (indide of unit) and replace fuse
per Section 5.08-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 LED ON; TEMP indicator ON
1. Airflow obstructed
a. Check for obstructed air flow and correct con-
dition.
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 LED
stops flashing before sending Start signal
3. Gas pressure too high or too low
a. Set pressure per Cut Speed Charts in appropri-
ate Torch Manual.
4. Faulty torch parts
a. Inspect torch parts and replace if necessary (re-
fer to Torch Instruction Manual supplied with
torch).
5. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
D. AC Power LED ON; Fans operating; No cutting
output
1. Torch not properly connected to power supply
a. Check that torch leads are properly attached to
power supply
2. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
E. Limited or Low cutting output with no control
1. Incorrect setting of CURRENT control
a. Check and adjusted to proper setting.
2. Poor input or output connections
a. Check all input and output connections.
3. Low plasma gas flow
a. Check for leaks or restriction in gas supply line
b. Replace all Torch Consumables
4. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
F. Erratic or improper cutting output
1. Poor input or output connections
a. Check all input and output connections.
2. Faulty torch parts
a. Inspect torch parts and replace if necessary (re-
fer to Torch Instruction Manual supplied with
torch).
G. AC Power LED indicator ON; Cutting output
available; Fan(s) not operating
1. Fan blades blocked
a. Check and clear blades.
2. Faulty components in unit
a. Return for repair or have qualified technician
repair per Service Manual.
H. AC POWER LED indicator ON; Fans operate; No
gas flow
1. Gas not connected or pressure too low
a. Check source for at least 80 psi (5.5 bar).
b. Verify setting of Secondary Gas Mode switch.