Operating instructions

Commissioning

Grad operating mode

G09-RIA452ZZ-15-00-xx-en-006

Fig. 17: 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"

menu.

The difference between the lower range value M

0-m

and the upper range value M

of the interval

is calculated. If the calculated value is greater that the value set under "Setpoint A", the relay is

switched in accordance with the failsafe mode configured in "Rel. Mode" (see Page 56).

The relay is switched on again once the difference between M

1-m

and M

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)

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