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PROBLEM:
Material leaks
around seat or in-
sulator block.
PROBLEM:
Hose or gun fails to
heat.
-
PROBLEM:
Gun overheats.
A-l HANDGUN
Probable Cause:
Suggested Correction:
1. Worn O-ring be-
tween body and
seat.
1. Replace O-ring.
2. Worn packing
cartridge seal.
2. Replace seal.
Probable Cause:
Suggested Correction:
1. Bulkmelter cir-
cuitry fault.
1. Refer to Troubleshooting in Bulkmelter
Manual.
2. Hose faulty
2. Replace hose.
3. Faulty gun
heater cartridges.
3. Disconnect MS connector from gun.
Using a multimeter set for ohms, check
resistance across cordset pins A and B:
4. Open or short in
cordset wiring.
Probable Cause:
1. RTD failed.
2. Open or short in
cordset wiring.
MANUAL NO. 26-4
Page 6-3
120 VAC handgun: 81-94 ohms
240 VAC handgun: 325-376 ohms
Replace heater(s) if resistance check
fails.
4. Check for cordset wiring for continuity
(closed circuit) between connector pins
and terminal strip. If an open or short
circuit exists, replace cordset.
Suggested Correction:
1, Disconnect MS connector from gun.
Using multimeter set for ohms, check
for resistance across cordset pins C and
D. Check should be done in ambient con-
ditions (75"F/24"C). The resistance
value should be 133-138 ohms. If resis-
tance check fails, replace RTD.
2. Check cordset wiring for continuity be-
tween connector pins and terminal
strip. If an open or short circuit exists,
replace cordset. See Figure 6-l.
Publication P/N 108 061
0 NORDSON CORPORATION 1993
All Rights Reserved
Issued 3/93
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