103
Auxiliary functions
Type 8792, 8793 REV.2
Only for type 8793 (process control):
→
/ 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
PV-Input. PV = process actual value
→
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.
You have set the signal fault detection for input signal.
* 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.
16.1.14.1. Behavior of the actuator when safety position deactivated or
activated
Selection
SafePos off
– The actuator remains in the position which corresponds to the set-point value
last transferred (default setting).
Selection
SafePos on
– Approaching the safety position activated:
In the event of a signal fault detection, the behavior of the actuator depends on the activation of
SAFEPOS
auxiliary function. See chapter “26.2.11. SAFEPOS – Inputting the safety position”.
•
SAFEPOS
activated:
In the event of a signal fault detection the actuator moves to the position
which is specified in the
SAFEPOS
auxiliary function.
•
SAFEPOS
not activated:
The actuator moves to the safety end position which it would assume if the
electrical and pneumatic auxiliary power failed.
See chapter “10.9. Safety end positions after failure of the electrical or
pneumatic auxiliary power”.
The activation for approaching the safety position (selection
SafePos on)
is possible only when
signal fault detection has been activated (
ERROR on)
.
english
Summary of Contents for 8792
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