Tweco 15XC Merlin - Manual (Page 96)

CUSTOMER/OPERATOR SERVICE 5-24 Manual 0-2251
5.11 TROUBLESHOOTING GUIDE (continued)
SYMPTOM POSSIBLE CAUSE REMEDY
H. COOLANT indicator off
I. Coolant conductivity
indicator off
J. DC indicator not lit (after
pre-flow), no main con-
tactor closure
K. DC indicator not lit (after
pre-flow), main contactor
comes on momentarily.
No pilot, no main arc
transfer
1. Little or no pressure
shown on gauge
2. Clogged torch or leads
3. Faulty flow switch (FS1)
4. Faulty logic board
5. Faulty LED/current
control board
1. Ionized or contaminated
coolant
2. Faulty (or contaminated)
conductivity probe
3. Faulty logic board
4. Faulty LED/current
control board
1. RUN/SET/PURGE switch
not set to RUN
2. Faulty torch switch,
remote panel, or remote
pendant
3. Open contactor coil (W1
or W2)
4. Faulty logic board
1. Switching transistor (Q1)
not turning on
1a.Check coolant level
1b. Check motor rotation and
rpm.
1c. Check and replace pump
if necessary
2. Check and torch and leads
and replace if necessary.
Flush coolant system
3. Check and replace flow
switch if necessary
4. See Section 5.12-Test H
and replace board if
necessary
5. See Section 5.12-Test H
and replace board if
necessary
1. Check coolant conductiv-
ity and deionizer cartridge
(Section 3.6). Replace both
if necessary
2. Clean conductivity probe
and replace if necessary
3. See Section 5.12-Test I and
replace board if necessary
4. See Section 5.12-Test I
and replace board if
necessary
1. Normal operation, set
switch to RUN position
2. See Section 5.12-Test J
3. Coil should measure
approx. 10 ohms
4. See Section 5.12-Test J
1. See Section 5.12-Test K