Endress+Hauser RIA452 - Page 29

RIA452 Commissioning
Endress+Hauser 29
Grad operating mode
G09-RIA452ZZ-15-00-xx-en-006
Fig. 16: Grad operating mode
The "Grad" operating mode is used for monitoring the changes in the input signal over time.
The time basis T
m
of the monitoring system is configured in the "PARAMETER/M55 -> Grad.
time" menu.
The difference between the lower range value M
0-m
and the upper range value M
0
of the
interval is calculated. If the calculated value is greater than the value set under "Setpoint A",
the relay is switched in accordance with the failsafe mode configured in "Rel. Mode"
(→ ä 40).
The relay is switched on again once the difference between M
1-m
and M
1
drops below the
value set in "Hysteresis". The sign determines the direction of signal change. Positive values
monitor an increase in the measured value while negative values monitor a decrease. A new
value is calculated every second (floating interval).
The following parameters must be configured:
Alarm operating mode
A relay with the "Alarm" operating mode is activated if the following events occur:
• Analog input (4-20 mA) < 3.6 mA (lower Namur limit) or > 21.0 mA (upper Namur limit)
• EEPROM HW error (E101)
The relay remains picked up even after acknowledging.
• Implausible calibration data (E103)
The relay remains picked up even after acknowledging.
• Bus error reading the min/max data after power-up (E104)
The relay remains picked up even after acknowledging.
Menu Function (menu item) Setting value
LIMIT 1 to 8/M10 to 17 Function
Setpoint A
Hysteresis
Max
Value for threshold
Value for hysteresis
Menu Function (menu item) Setting value
LIMIT 1 to 8/M10 to 17 Function
Setpoint A
Hysteresis
Grad. time
Grad
Gradient value for threshold
Value for hysteresis
Interval time in seconds