Endress+Hauser RIA452 Manuel De Mise En Service page 72

Commissioning
72
Grad operating mode
Measured value
M
0
M
0-m
Fig. 18: Grad operating mode
The "Grad" operating mode is used for monitoring the changes in the input signal over time. The
time basis t of the monitoring system is configured in the "PARAMETER/M55 -> Grad. time"
m
menu.
The difference between the lower range value M
calculated. If the calculated value is greater that the value set under "Setpoint A", the relay is
switched currentless.
The relay is switched on again once the difference between M
in "Hysteresis". The sign determines the direction of signal change. A new value is calculated every
1.0 s (floating interval).
The following parameters must be configured:
Menu
LIMIT 1...8/M10...17
Delay
Measured value
Threshold
Max
Threshold
- hysteresis
Fig. 19: Delay
M
1-m
M
1
T T
T
m m
1
T
0
and the upper range value M
0-m
Function (menu item)
Function
Setpoint A
Hysteresis
Delay
T = Time for gradient
m
evaluation
t
Relay at quiescent state
Relay at fault state
of the interval is
0
and M drops below the value set
1-m 1
Setting value
Grad
Gradient value for threshold
Value for hysteresis
Hysteresis
t
Relay at quiescent state
Relay at fault state
Endress+Hauser
RIA452