Burkert Type 8791 - Manual (Page 49)

49
ConfiguringAuxiliaryFunctions
8.5.6. SAFE.POSITION -
definition of the Safe position
This function specifies the actuator safety position which is approached at defined signals.
The set safety position is only approached if there is a corresponding signal at the binary input (for con-
figuration see
BINARY INPUT) or if a signal error occurs (for configuration see SIGNAL ERROR).
If the mechanical stroke range is limited with the X.LIMIT function, only safety positions within these limits
can be approached.
This function is executed in AUTOMATIC mode only.
0 % SAFE POSITION safety position
Fig. 44: SAFE POSITION function
8.5.7. SIGNAL.ERROR -
configuration of signal level fault detection
The SIGNAL ERROR function is used to detect a fault on the input signal.
Fault detection
Fault detection can be selected for a 4 – 20 mA signal only:
Fault if input signal ≤ 3.5 mA (± 0.5% of final value, hysteresis 0.5% of final value)
If 0 – 20 mA is selected, sensor break detection cannot be selected.
SIGNAL ERROR setpoint error detection OFF
OFF
ON
Fig. 45: SIGNAL ERROR -1 function
After "setpoint error detection” ON is selected, a new dropdown list appears:
SIGNAL ERROR setpoint error detection
safety position if setpoint error ON
OFF
OFF
ON
Fig. 46: SIGNAL ERROR -2 function
English
Software Tool - Positioner