Endress+Hauser promag 30 - Fault Location and Remedies; Behaviour of the measuring equipment in the event of a fault or alarm

6. Fault Location and Remedies
6.1 Behaviour of the measuring equipment in the event
of a fault or alarm
Notes!
• Errors which occur while operation is in progress are emitted at the status output,
provided its configuration is appropriate (see page 37).
• An LED is also situated on the amplifier board of the Promag 30 (see Fig. 44). This
LED is always lit as long as the measuring system is operating correctly. In case of
error the LED is flushing, thus indicating an error. If the LED ist neither lit nor
flashing there is a power supply breakdown.
Warning!
Error diagnosis for Ex-instruments cannot be done using an LED, as the ignition
protection type is then no longer valid.
The Promag 30 measuring system reacts to faults or an alarm in the following manner:
Type of fault Behaviour of the outputs
➤
Status output open, i.e. open collector not
conducting (see page 34).
System error (fault, failure)
Process error (alarm)
Supply failure
➤
Pulse output: No output of pulses until the
fault has been cleared.
➤
Current output: The current is set to a definite
value until the fault has been cleared.
0...20 mA
⇒
0 mA
4...20 mA
⇒
2 mA
Note!
With measured value suppression the following points are important:
• System errors are given as usual over the status output.
• Process errors have a lower priority and are not given at the status output with
active measured value suppression.
Warning!
Error messages on the display
➤
System error
⇒
ERROR segment visible
➤
Process error
⇒
EDP segment visible
(Empty Pipe)
➤
Overflow
⇒
Overflow segment visible
ba008y38
Fig. 41
Promag 30 6. Fault Location and Remedies
Endress+Hauser 45