102
Auxiliary functions
Type 8792, 8793 REV.2
16.1.14
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 only 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 set-point value default (internal or
external)”.
Set the signal fault detection for input signal as follows: ( Setting on the process level)
→
/ Select
SIG.ERROR
. (To do this, the auxiliary function must be incorporated into the main menu).
→
Select
ENTER
. The input screen for setting the signal fault detection for input signal is displayed.
→
/ Select
SP/CMD Input. SP = process set-point value, CMD = set-point position
→
Select
ENTER
.
→
/ Select
Error off
(deactivate signal fault detection).
Select
Error on
(activate signal fault detection).
→
Select
SELEC
.The selection is marked by a filled circle .
→
/ Select
SAFEPOS
(Deactivating/activating approach of the safety position
*
)
.
→
/ Select
SafePos off
.
Select
SafePos on**
.
→
Select
SELEC
.The selection is marked by a filled circle .
→
Select
EXIT
and return to the
SP/CMD
input menu.
→
Select
EXIT
and return to the
SIG.ERROR
menu.
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