Rockwell Automation 1746-BTM Barrel Temperature Control Module User Manual - Manual (Page 68)

Publication 1746-UM010B-EN-P - April 2001
8-4 Troubleshooting the Module
Table 8.B Autotune Error Codes
Code Description
66
Autotune terminated because of TC break
67 Start conditions prevent heat autotune
68
Start conditions prevent cool autotune
69
Setpoint will be reached before autotuning is complete
70
Too much noise causing time constant to be 0
71
Very small gain
72
PV now higher than maximum PV; do not trust PID values