Burkert Type 8793 - Manual (Page 124)

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Auxiliary functions
26.2.12. SIG.ERROR – Configuration of signal level fault detection
The SIG-ERROR function is used to detect a fault on the input signal.
If signal fault detection is activated, the respective fault is indicated on the display.
(See Chapter “35.1. Error messages on the display”.
A fault detection on the input signal is only possible for signal types 4 -20 mA and Pt 100.
The particular menu branch is hidden for other signal types.
• 4.-.20.mA: Fault if input signal (≤.3.5 mA (± 0.5 % of final value, hysteresis 0.5 % of final value )
• Pt.100 (can be set for process controller Type 8793 only):
Fault if input signal 225 °C (± 0.5 % of final value, hysteresis 0.5 % of final value)
The signal type is set in the following menus:
1 . INPUT (for Types 8792 and 8793):
See Chapter “23.1. INPUT - Setting the input signal”.
2. P.CONTROL (for Type 8793 and when process controller activated):
See Chapter “25.2.1. PV-INPUT – Specifying signal type for the process actual value”.
NOTE: The fault detection is only possible if the external set-point value default was selected in
SP-
INPUT. See Chapter “25.2.3. SP-INPUT – Type of the set-point value default (internal or external)”.
Deactivate
Deactivate
Activate
Activate
SELEC
SELEC
SP/CMD Input
PV Input
Error off
Error off
Error on
Error on
SAFEPOS
SAFEPOS
ENTER
EXIT
SIG.ERROR
ENTER
ENTER
ENTER
ENTER
For.Type.8793.only.(process control):
Signal fault detection for
input signal:
Signal fault detection
for input signal:
EXIT
Signal fault detection
Signal fault detection
Deactivate/activate approach of
safety position*
Deactivate/activate approach of
safety position*
SELEC
SELEC
SafePos off
SafePos off
SafePos on
SafePos on
EXIT
EXIT
**
**
SP = Process set-point
value
CMD = Set-point position
PV = Process actual
value
EXIT
* Approaching the safety position can be set only when signal fault detection (Error on) has been activated.
When signal fault detection (Error off) has been deactivated, the message "not available" is indicated.
** For behavior of the actuator during a signal fault detection see the following description.
Figure 72: Operating structure SIG-ERROR
english
Type 8792, 8793