Check Rtd; Check Thermal Cutoff - Graco InvisiPac GM100 Plug-Free Instructions Manual

Troubleshooting

Check RTD

Check the continuity of the RTD to verify proper
resistance. If here is no continuity, the RTD has failed
and needs to be replaced.
1. Disable the applicator. See Before Beginning
Repair on page 19.
2. Check the resistance of the RTD using a multi-meter
between the pins of the cordset connector. See the
illustrations of the two types of connectors in Table
1 and Table 2 on page 17.
Cordset Check Pins
24W087, D and E
24X039,
24X760, or
25E783 Pt
100 (385)
RTD
Cordset
24W088, 3 and 5
24X040, or
24X761 Ni
120 RTD
Cordset
3. Replace the RTD if the resistance reading is outside
the range or if there is no continuity. See Replace
RTD on page 20.
18
Resistance
Values at Room
Temperature
107-115 Ohms
130-140 Ohms

Check Thermal Cutoff

If working properly, the cutoff will trip at 500° F (260° C)
and rest at 420° F (216° C). If failure is suspected, allow
the applicator to cool and then check the continuity of
the thermal cutoff to verify it has not failed. If there is no
continuity, the cutoff has failed and needs to be
replaced.
1. Disable the applicator. See Before Beginning
Repair on page 19.
2. Remove the cover plate.
3. Check for continuity using a multi-meter between
the pin of the cordset connector and the wire from
the thermal cutoff that connects to the heater lead.
See the illustrations of the two types of connectors
in Table 1 and Table 2 on page 17.
Cordset
24W087, 24X039, or 24X760 Pt
100 (385) RTD Cordset
24W088, 24X040, or 24X761 Ni
120 RTD Cordset
Check Pins
A
1
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