Endress+Hauser iTEMP HART Communication TMT 182 Bedienungsanleitung Seite 35

iTEMP® HART® Communication
Application fault without
messages
Endress+Hauser
4.3 Application faults without messages
General application faults
Fault
No communication
Application faults for RTD connection (Pt100/Pt500/Pt1000/Ni100)
Fault
Fault current
≤ ≥
( 3.6 mA or 21 mA)
Measured value incorrect/
inaccurate
Cause
No power supply on 2 wire circuit
Power supply too low (<10 V)
Defective interface cable
Defective interface
Defective head transmitter
Cause
Defective sensor
Incorrect RTD connection
Incorrect 2 wire connection
Transmitter programming faulty
(wire number)
Programming
Defective head transmitter
Faulty sensor installation
Heat conducted via sensor
Transmitter programming faulty
(wire number)
Transmitter programming faulty
(scale)
Wrong RTD used
Sensor connection (2 wire)
Sensor cable (2 wire) not
compensated
Offset incorrectly set
4 Trouble-shooting
Action/cure
Check current loop
Connect cables correctly to
terminal plan (polarity)
Check interface cable
Check PC interface
Replace head transmitter
Action/cure
Check sensor
Reconnect cables correctly
(connection diagram)
Connect cables correctly to
terminal plan (polarity)
Change parameter
'CONNECTION' (See
"Description of unit functions" on
page 29.)
Thermocouple set up (s.
chapter 3.2.5); change to RTD
Replace head transmitter
Install sensor correctly
Take note of sensor installation
length
Change parameter 'Connection
type'
Change scale
Change parameter 'Sensor type'
Check sensor connections
Compensate cable resistance
Check offset
35