ABB STT04 Instruction Manual page 226

TB82 TRANSMITTER
Table N-1. Problem Codes of TB82 Transmitter
Code Description
HI.TEMP Temperature above
transmitter range
LO.C.CKT Cable diagnostic circuit
failure - low range error
LO.CA.AD Cable diagnostic signal
below transmitter A/D range
LO.EFF Low sensor efficiency
(<60%)
LO.G.CKT pH measuring electrode
impedance circuit failure -
low range error
PROBLEM AND ERROR CODES (TB82)
N - 20
Corrective Action
Verify process conditions are within transmitter range. PV must
be within transmitter range.
Verify process conditions are within configured output range. If
PV is outside configured range, increase output range.
Verify sensor wiring connections.
Remove any liquids, oils, scales or corrosion from transmitter ter-
minal block or extension cable junction box terminals.
Clean sensor and perform a buffer and process calibration.
Conduct a temperature calibration. If not using temperature sen-
sor, verify configuration for TMP.SNS is NONE.
Electronically test the sensor and temperature compensator
(refer to the product instruction). Replace sensor if it does not
meet requirements.
Verify sensor wiring connections.
Remove any liquids, oils, scales or corrosion from transmitter ter-
minal block or extension cable junction box terminals.
Electronically test sensor. Replace if it does not meet require-
ments.
Input PCB assembly diagnostic circuit failure exists. Disable
diagnostics and order replacement input PCB assembly. Existing
input PCB assembly should properly function until new assembly
is received.
Input PCB assembly diagnostic circuit failure exists. Disable
diagnostics and order replacement input PCB assembly. Existing
input PCB assembly should properly function until new assembly
is received.
Verify proper buffer values were used for calibration and repeat
buffer calibration.
Clean sensor and repeat buffer calibration.
Look for shorts in sensor and extension cable. Remove all poten-
tial shorts. Remove any liquids, oils, scales or corrosion from
transmitter terminal block or junction box terminals.
If sensor is functioning properly, order new sensor to replace
existing sensor once transmitter does not accept calibration val-
ues.
Verify sensor wiring connections.
Verify glass electrode is intact. If broken, replace sensor.
Remove any liquids, oils, scales or corrosion from transmitter ter-
minal block or extension cable junction box terminals.
Verify sensor responds to pH buffers. Replace sensor if it does
not respond.
Change configuration to proper analyzer type if sensor is not a
glass pH sensor.
Input PCB assembly glass pH impedance circuit failure exists.
Disable diagnostics and order replacement input PCB assembly.
Existing input PCB assembly should properly function until new
assembly is received.
(continued)