6.3 Setting relay activation limit using hysteresis
If the measurement you are using to control the relay is likely to move back and forth close to
the activation setpoint, you can set a hysteresis that prevents the relay switching on and off
too frequently.
When hysteresis is used, the relay activates at the defined limit, but does not switch off
immediately when the measurement moves back to the other side of the activation limit.
Instead, with hysteresis, the relay remains active until the measurement reaches the defined
tolerated variation limit.
Figure 22 Relay settings example: one setpoint with hysteresis
To define a single setpoint for relay activation when the measurement falls below the defined
activation limit (
Activate below
) using hysteresis:
1. Select
to access Insight main menu.
2. In the
Configure Device
menu, select either relay A or relay B.
3. Enable the relay output by setting
Relay output on/off
to ON.
4. Select the measurement parameter that is used to control the relay with the
Output
parameter
dropdown.
The parameter options depend on the connected probe. Note that the parameter units are
defined in the
Settings
5. Enter the activation limit value in the
Activate below
field.
6. Leave the
Activate above
field empty.
7. Enter the hysteresis value in the
Hysteresis
field.
8. Select the
Error output state
for the relay.
Indigo201 User Guide
M212842EN-B
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