Endress+Hauser Waterpilot FMX21 - Response of Output to Errors; Troubleshooting Specific to TMT182 Temperature Head Transmitter

Diagnostics and troubleshooting Waterpilot FMX21
68 Endress+Hauser
Error description Reason Corrective action
Waterpilot defective Replace the Waterpilot.
Temperature measured value
is inaccurate/incorrect (only
for Waterpilot FMX21 with
Pt100)
Pt100 connected in 2-wire circuit, cable
resistance was not compensated for
• Compensate the cable resistance.
• Connect Pt100 as 3-wire or 4-wire
circuit.
10.4 Troubleshooting specific to TMT182 temperature
head transmitter
Error description Reason Corrective action
No measuring signal 4 to 20 mA cable not connected
correctly
Connect device as per.
No power supplied via the 4 to 20 mA
cable
Check current loop.
Supply voltage too low (at least 10.5 V
DC)
• Check supply voltage.
• Overall resistance greater than
max. load resistance
Error current ≤ 3.6 mA or ≥ 21
mA
Pt100 not connected correctly Connect device as per.
4 to 20 mA cable not connected
correctly
Connect device as per.
Pt100 resistance thermometer
defective
Replace the Waterpilot.
Temperature head transmitter
defective
Replace the temperature head
transmitter.
Measured value is inaccurate/
incorrect
Pt100 connected in 2-wire circuit,
cable resistance was not compensated
for
• Compensate the cable
resistance.
• Connect Pt100 as 3-wire or 4-
wire circuit.
10.5 Response of output to errors
The behavior of the current output in case of fault is defined by the following
parameters:
• "Alarm behav. P (050)"
• "Output fail mode (190)"
• "High alarm curr. (052)"