Advanced Poly-Packaging Advanced Poly-Bagger T-1000, Operation Manual

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4.20
Replace Thermocouple Wire
A thermocouple wire brazed to a ring terminal and secured to the top of the upper heater bar,
detects the amount of heat the heater bar is emitting. The thermocouple wire is considered a
normal wear item and will infrequently fail, requiring replacement.
To determine if the thermocouple is bad, follow these trouble-shooting steps: 1) Locate the
"E13" light (Open Thermocouple Alarm) on the Interface Board (Fig. 4-9). If the light is ON,
proceed to step two. 2) Another indicator that the thermocouple wire is bad is the "XO" (Heater
Bar Temp. Readout) LED on the PLC Board (Fig. 4-8) will flash slowly. 3) Additionally, the
“YO" (Heater Circuit) LED (Fig. 4-8) will not be illuminated (unless the Energy Saver has shut
off the heater bar after 25 minutes).
If the above conditions are met, the thermocouple is bad and the current to the heater bar has been
turned OFF.
To replace the thermocouple wire, turn the main power to the OFF position, unplug the power cord
and disconnect the air line.
Remove the front plate and PTFE anti-stick assembly, as described in Chapter 4.13. Remove the
screws which holds the ring terminal and the jacketed wire clamp. Disconnect the connector and
remove the wire. Reverse these steps to replace the wire.
CAUTION: To avoid stretching or breaking the wire during heater cylinder extension, ensure that
the wire is looped free to bend during heater bar movement.
Replace the PTFE assembly and front plate as described in Chapter 4.13.