25.2.12 Sig.error - Configuration Of Signal Level Fault Detection - Burkert 8792 Operating Instructions Manual

Type 8792, 8793 Type 8792, 8793
Configuring the auxiliary functions
25.2.12 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 "32.1 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 (intern or
extern)".
SIG.ERROR
ENTER
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.
Fig. 71: Operating structure SIG-ERROR
Signal fault detection for
input signal:
SP/CMD Input
ENTER
SP = Process set-point
value
CMD = Set-point position
EXIT
For Type 8793 only (process control):
Signal fault detection
for input signal:
ENTER
PV Input
PV = Process actual
value
EXIT
Signal fault detection
SELEC
Deactivate
Error off
Error on Activate
Deactivate/activate approach of
safety position*
SAFEPOS ENTER
EXIT
Signal fault detection
SELEC
Error off Deactivate
Error on Activate
Deactivate/activate approach of
safety position*
SAFEPOS
ENTER
EXIT
english
SELEC
SafePos off
**
SafePos on
SELEC
SafePos off
**
SafePos on
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