Instruction Manual

Watlow EZ-ZONE
®
PM Limit Controller • 89 • Appendix
Detection of and Rules Around Abnormal Sensor Conditions
Inputs Detection of Abnormal Conditions
Thermocouple
Shorted No direct detection, Open loop firmware detection.
Open Yes, Parasitic pull-up
Reversed Yes, firmware detection
Current Source
Shorted Range limiting only
Open Range limiting only
Reversed Range limiting only
Voltage Source
Open Range limiting only
Shorted Range limiting only
Reversed Range limiting only
RTD
S1open Yes, pulled up.
S2 open Not implemented.
S3open Yes, pulled up.
S1shorttoS2 Yes, pulled up
S1shorttoS3 Yes, pulled down to under range.
S2shortedtoS3 Not implemented, Possible, monitor S2 voltage.
S1 andS2open Yes, pulled down to under range.
S1 andS3open Yes,S1pulledup.
S2 andS3open Yes pulled up.
Thermistor
S1open Yes, pulled up to sensor over range.
S3open Yes, pulled up to sensor over range.
S1shorttoS3 Yes, pulled down to sensor under range.
S1andS3open Yes,S1pulleduptosensoroverrange.