Watlow ez-zone pm - Page 235

Watlow EZ-ZONE
®
PMI Controller • 231 • Chapter 11 Appendix
Indication Description Possible Cause(s) Corrective Action
EZ-Key/s do
not work
EZ-Key/s do not
activate required
function
• EZ-Key function incorrect
• EZ-Key function instance
not correct
• Keypad malfunction
• Verify EZ-Key function in
the Setup Menu
• Correct and change the
function instance if not
correct
• Replace or repair control-
ler
Displayed val-
ue to low
uaL.L
Value to low to be
displayed in 4 digit
LED display <-1999
• Incorrect setup • Check scaling of source
data
Displayed val-
ue to high
uaL.h
Value to high to be
displayed in 4 digit
LED display >9999
• Incorrect setup • Check scaling of source
data
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.